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Callisto 930 nm OCT Imaging System

Callisto 930 nm OCT Imaging System

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Exploring the Options?

We can provide recommendations based on your needs and partner with you to obtain images of samples provided by you demonstrating the effects of various components on image quality. Demos of our OCT systems can be arranged at our Sterling, VA (USA); Shanghai, China; Tokyo, Japan; and Lübeck, Germany facilities.

In the Budgetary Phase?

System prices vary based on the exact components. Through our conversations, we can ensure your system quote is tailored to your requirements.

OEM or Custom Projects?

Click here to learn about our OEM capabilities.

Thorlabs OCT Group
OCT Applications Team Based in Lübeck, Germany

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OCT Systems Comparison
Customization Options
Application Articles


  • Configurable OCT Systems Optimized for High-Sensitivity Imaging
    • 1.2 kHz A-Scan Rate and 107 dB Sensitivity
    • 7 µm Axial Resolution in Air with 1.7 mm Imaging Depth
      (930 nm Center Wavelength)
  • Includes Computer and ThorImage®OCT Software Package (See the Software Tab)
  • Build-Your-Own and Preconfigured Systems Available
  • See the Brochures Tab for More Information on Thorlabs' OCT Systems

Choose Components to Build or Customize Your OCT System

  • One 930 nm, High-Sensitivity Base Unit (Required)
  • Standard, User-Customizable, and Handheld Scanners Available
  • Scan Lens Kits to Optimize Lateral Resolution and Focal Length for Your Application
  • Ring- and Immersion-Style Sample Z-Spacers for Air or Liquid Imaging Applications
  • Scanner Stand and Translation Stage Accessories
  • Contact Our OCT Team to Request a Quote and Discuss Building a System

Optical Coherence Tomography (OCT) is a noninvasive optical imaging technique that produces real-time, 2D cross-sectional and 3D volumetric images of a sample. This technique provides structural information about the sample based on light backscattered from different layers of material within that sample, producing images with micron-level resolution and millimeters of imaging depth. OCT imaging can be considered as an optical analog to ultrasound imaging that achieves higher resolution at the cost of decreased penetration depth. In addition to high resolution, the non-contact, noninvasive nature of OCT makes it well suited for imaging samples such as biological tissue, small animals, and industrial materials.

Thorlabs' Callisto Series of OCT Imaging Systems are designed for high sensitivity and are ideal for imaging static, in vitro samples. The 64-bit software pre-installed on the included computer displays and processes 2D and 3D OCT data in real time. Choose from a number of scanner options including a robust standard scanner, user-customizable scanner, and the portable handheld scanner. Optional accessories are available below to customize your OCT system to meet the requirements of your application. Additionally, Thorlabs offers a complete, preconfigured OCT system for 930 nm based on the components sold on this page.

The components below can also be used to upgrade your existing Thorlabs OCT system with additional features and are fully compatible out of the box with Thorlabs' OCT systems and accessories. While most systems are upgradable, we recommend contacting the OCT Team to determine the optimal solution for your system and intended application.

Click on the Image Below or in the Table to the Right for Details on Customization Options

Telesto Base UnitTelesto Base UnitOCT Sample StageOCT StandBorder1Border2
Components and Accessories
OCT Base Unit
(Computer Included)
Scanning System
Scan Lens Kit
Reference Length Adapter
(For Standard Scanners Only)
Sample Z-Spacer
Adjustable Scanner Stand
Translation Stage
Preconfigured System
(Z-Spacer Not Included)

ThorImage®OCT Software Index


OCT Scan Control Screen Shot
Click to Enlarge

Rendered Volume with Modifiable Clipping Plane of a Zebrafish

ThorImageOCT Software

  • Interactive Scan Position Control through Video Display for Common Line Scans or Freeform Pattern Scans
  • Advanced Dataset Management
  • Access to Raw Spectra, Processsed Data, and All Calibration Files Necessary for User-Designed Processing Routines
  • High-Speed Volume Rendering of 3D Data
  • Doppler and Speckle Variance Imaging
  • Versatile Scan and Acquisition Control, such as Averaging or Adjustable Scan Speeds

ThorImageOCT is a high-performance data acquisition software, which is included with all Thorlabs OCT systems. This 64-bit Windows-based software package performs data acquisition, processing, scan control, and displays OCT images. Additionally, NI LabVIEW and C-based Software Development Kits (SDKs) are available, which contain a complete set of libraries for measurement control, data acquisition and processing, as well as storage and display of OCT images. The SDKs provide the means for developing highly specialized OCT imaging software for every individual application.

OCT Scan Control Screen Shot
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Various acquisition parameters can be adjusted in ThorImageOCT.

Scan Control

ThorImageOCT provides numerous scan and acquisition controls. The camera integrated in the scanner of our OCT systems provides live video images in the application software. Defining the scan line for 2D imaging or the scan area for 3D imaging is accomplished through the easy-to-use "Draw and Scan" feature by clicking on the video image.

High Speed OCT Software Draw and Scan Line
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The Sample Monitor can be used to define the scan pattern using the "Draw and Scan" feature.

Arbitrary forms defined by the Draw & Scan feature or loaded .txt files can be scanned. The scan pattern can also be adjusted by specifying suitable parameters in the controls of the software, as shown to the right.

High Speed OCT Software Draw and Scan Circle
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A predefined circle scan pattern can be loaded and scanned in the software. The size can be changed with the Zoom feature.
High Speed OCT Software Draw and Scan Triangle
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A predefined triangle scan pattern can be loaded and scanned in the software. The size can be changed with the Zoom feature.

Additionally, one can further set processing parameters, averaging parameters, and the speed and sensitivity of the device using device presets. By using a high-speed preset, video-like frame rates in 2D and fast volume rendering in 3D are possible, whereas high-sensitivity acquisition is enabled by choosing a preset with a lower acquisition speed.

ThorImage OCT Dataset Management Panel
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The Dataset Management Window of ThorImageOCT

Dataset Management

ThorImageOCT provides advanced dataset management capabilities, which allow opening several datasets simultaneously. Datasets are uniquely defined using an identifier consisting of a study (or test series) name and an experiment number. Grouping of datasets can be achieved by using the same study name. The "Captured Datasets" list shows an overview of all open datasets, including the dataset identifier, the acquisition mode, and preview pictures of the still video image and the OCT data.

Datasets can be exported in various image formats, such as PNG, BMP, JPEG, PDF, or TIFF. The set can also be exported in complete data formats suited for post-processing purposes, such as RAW/SRM, FITS, VTK, VFF, and 32-bit floating-point TIFF.

The OCT file format native to ThorImageOCT allows OCT data, sample monitor data, and all relevant metadata to be stored in a single file. ThorImageOCT can also be installed and run on computers without OCT devices in order to view and export OCT data. The user has full access to the raw and processed data from the device, including additional data used for processing, e.g. offset errors.

Third Party Applications

If both ImageJ and ThorImageOCT are installed on the computer, opening acquired OCT data in ImageJ is one mouse click away. This enables a flawless workflow when requiring the advanced image processing functionality provided by ImageJ. Clicking the Explorer button will open the folder and select the file in Windows Explorer where the currently active dataset is stored.

ThorImage OCT Third Party Applications Panel
Export buttons are accessible in the Action Toolbar of ThorImageOCT.


Imaging Modes

Different OCT imaging modes can be selected using the mode selector. If the ThorImageOCT software finds a compatible system connected and switched on, all operational modes will be selectable. If no OCT device is present, only the data viewing mode for viewing and exporting OCT data will be available.

OCT Software 1D Mode M-scan
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Several A-Scans at a Single Point Over Time (M-Scan)
OCT Software 1D Mode
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Spectral and Depth Information for a Single Point (A-Scan)

1D Mode

The 1D Mode provides the possibility to measure at a single point. The single point measurement not only provides spectral information and depth information, but also gives the possibility to observe time related behavior of a sample with an M-Scan.


OCT Software 2D Mode
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ThorImageOCT Window in the 2D Mode

2D Mode

In the 2D imaging mode, the probe beam scans in one direction, acquiring cross-sectional OCT images which are then displayed in real time. Line averaging before or after the Fast Fourier Transform (FFT) is available, as well as B-Scan averaging. Image display parameters, such as color mapping, can be controlled in this mode. We have also implemented an option for automatic calculation of the optimum contrast and brightness of the displayed OCT images.


3D Mode

In the 3D imaging mode, the OCT probe beam scans sequentially across the sample to collect a series of 2D cross-sectional images which are then processed to build a 3D image.

In the ThorImageOCT software, 3D volume datasets can be viewed as orthogonal cross-sectional planes (see below) and volume renderings.

The Sectional View features cross-sectional images in all three orthogonal planes, independent of the orientation in which the data was acquired. The view can be rotated as well as zoomed in and out.

The Rendering View provides a volumetric rendering of the acquired volume dataset. This view enables quick 3D visualization of the sample being imaged. Planes of any orientation can be clipped to expose structures within the volume. The 3D image can be zoomed in and out as well as rotated. Furthermore, the coloring and dynamic range settings can be adjusted.

Utilizing the full potential of our high-performance software in combination with our high-speed OCT systems, we have included a Fast Volume Rendering Mode in the ThorImageOCT software, which serves as a preview for high-resolution 3D acquisitions. In this mode, high-speed volume renderings can be displayed in real-time, providing rapid visualization of samples in three dimensions.

OCT 3D Imaging Screen Shot
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Rendering View of ThorImageOCT
OCT 3D Imaging Screen Shot
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Sectional View of ThorImageOCT


OCT Doppler Imaging Screen Shot
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Doppler dataset showing the velocity of a rotated plastic stick with opposite flow directions.

Doppler Mode

Doppler OCT imaging comes standard with all OCT systems. In the Doppler mode, phase shifts between adjacent A-scans are averaged to calculate the Doppler frequency shift induced by particle motion or flow. The number of lateral and axial pixels can be modified to change velocity sensitivity and resolution during phase shift calculation. The Doppler images are displayed in the main window with a color map indicating forward- or backward-directed flow, relative to the OCT beam.


OCT Speckle Variance Imaging Screen Shot
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Speckle variance measurement showing blood vessels of a mouse brain.

Speckle Variance Mode

The speckle variance imaging mode is an acquisition mode which uses the variance of speckle noise to calculate angiographic images. It can be used to visualize three dimensional vessel trees without requiring significant blood flow and without requiring a specific acquisition speed window. The speckle variance data can be overlaid on top of intensity pictures providing morphological information. Different color maps can be used to display the multimodal pictures.


Externally-Triggered Acquisition

ThorImageOCT and the SDK APIs provide the ability to externally trigger the acquisition of A-Scans. This enables the user to synchronize measurements from different modalities (e.g. vibrometry and synchronized positioning) with an OCT measurement. Synchronization is greatly simplified with all current CameraLink-based Thorlabs OCT systems (a TTL level trigger signal source required). External triggering is available for all imaging modes and can be toggled in the settings dialog in ThorImageOCT.


OCT Software Probe Calibration
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Probe Calibration Window in ThorImageOCT

Easy Probe Calibration

Changing to a different scan lens kit will generally require a different probe configuration in order to adapt to changes in the optical parameters of the system. When an additional scan lens is purchased for your Thorlabs OCT scanner system, ThorImageOCT enables you to easily create a fitting configuration for your new scan lens by using the calibration sample shipped with the lens and an intuitive step-by-step calibration process (shown to the right).


Video Showing Screencast of ThorImageOCT Rendering Capabilities

In this video, OCT images of a finger are acquired and manipulated in the 3D volume and cross section modes.

Optical Coherence Tomography Tutorial

Optical Coherence Tomography (OCT) is a noninvasive optical imaging modality that provides real-time, 1D depth, 2D cross-sectional, and 3D volumetric images with micron-level resolution and millimeters of imaging depth. OCT images consist of structural information from a sample based on light backscattered from different layers of material within the sample. It can provide real-time imaging and is capable of being enhanced using birefringence contrast or functional blood flow imaging with optional extensions to the technology.

Thorlabs has designed a broad range of OCT imaging systems that cover several wavelengths, imaging resolutions, and speeds, while having a compact footprint for easy portability. Also, to increase our ability to provide OCT imaging systems that meet each customer’s unique requirements, we have designed a highly modular technology that can be optimized for varying applications.

Application Examples

Art Conservation
Art Conservation
Drug Coatings
Drug Coatings
3D Profiling
3D Profiling
In Vivo
Small Animal
Small Animal
Tissue Birefringence
Tissue Birefringence
Mouse Lung
Mouse Lung
Retina Cone Cells
Retina Cone Cells

OCT is the optical analog of ultrasound, with the tradeoff being lower imaging depth for significantly higher resolution (see Figure 1). With up to 15 mm imaging range and better than 5 micrometers in axial resolution, OCT fills a niche between ultrasound and confocal microscopy.

In addition to high resolution and greater imaging depth, the non-contact, noninvasive advantage of OCT makes it well suited for imaging samples such as biological tissue, small animals, and materials. Recent advances in OCT have led to a new class of technologies called Fourier Domain OCT, which has enabled high-speed imaging at rates greater than 700,000 lines per second.1 

Fourier Domain Optical Coherence Tomography (FD-OCT) is based on low-coherence interferometry, which utilizes the coherent properties of a light source to measure optical path length delays in a sample. In OCT, to obtain cross-sectional images with micron-level resolution, and interferometer is set up to measure optical path length differences between light reflected from the sample and reference arms.

There are two types of FD-OCT systems, each characterized by its light source and detection schemes: Spectral Domain OCT (SD-OCT) and Swept Source OCT (SS-OCT). In both types of systems, light is divided into sample and reference arms of an interferometer setup, as illustrated in Fig 2. SS-OCT uses coherent and narrowband light, whereas SD-OCT systems utilize broadband, low-coherence light sources. Back scattered light, attributed to variations in the index of refraction within a sample, is recoupled into the sample arm fiber and then combined with the light that has traveled a fixed optical path length along the reference arm. A resulting interferogram is measured through the detection arm of the interferometer.

The frequency of the interferogram measured by the sensor is related to depth locations of the reflectors in the sample. As a result, a depth reflectivity profile (A-scan) is produced by taking a Fourier transform of the detected interferogram. 2D cross-sectional images (B-scans) are produced by scanning the OCT sample beam across the sample. As the sample arm beam is scanned across the sample, a series of A-scans are collected to create the 2D image.

Similarly, when the OCT beam is scanned in a second direction, a series of 2D images are collected to produce a 3D volume data set. With FD-OCT, 2D images are collected on a time scale of milliseconds, and 3D images can be collected at rates now below 1 second. 

Spectral Domain OCT vs. Swept Source OCT

Spectral Domain and Swept Source OCT systems are based on the same fundamental principle but incorporate different technical approaches for producing the OCT interferogram. SD-OCT systems have no moving parts and therefore have high mechanical stability and low phase noise. Availability of a broad range of line cameras has also enabled development of SD-OCT systems with varying imaging speeds and sensitivities.

SS-OCT systems utilize a frequency swept light source and photodetector to rapidly generate the same type of interferogram. Due to the rapid sweeping of the swept laser source, high peak powers at each discrete wavelength can be used to illuminate the sample to provide greater sensitivity with little risk of optical damage.

FD-OCT Signal Processing

In Fourier Domain OCT, the interferogram is detected as a function of optical frequency. With a fixed optical delay in the reference arm, light reflected from different sample depths produces interference patterns with the different frequency components. A Fourier transform is used to resolve different depth reflections, thereby generating a depth profile of the sample (A-scan).

1V.Jayaraman, J. Jiang, H.Li, P. Heim, G. Cole, B. Potsaid, J. Fujimoto, and A. Cable, "OCT Imaging up to 760 kHz Axial Scan Rate Using Single-Mode 1310 nm MEMs-Tunable VCSELs with 100 nm Tuning Range," CLEO 2011 - Laser Applications to Photonic Applications, paper PDPB2 (2011).

Brochure and Configuration Chart

The buttons below link to PDFs of printable materials and a graphical customization guide for our Callisto Series OCT Systems.

OCT Systems Brochure

Ganymede Series Configuration Options

Posted Comments:
jvigroux  (posted 2012-02-22 12:34:00.0)
A response from Julien at Thorlabs: Thank you for your feedback! We will check immediately what the problem is with those links. concerning your original request, we will contact you directly to further discuss the details of your application.
david.d.simon  (posted 2012-02-22 08:26:28.0)
The request demo and contact us links for this page are not working. The lab I work in is interested in the Callisto SD-OCT and is interested in setting up a demo.
jvigroux  (posted 2011-12-02 12:24:00.0)
A response from Julien at Thorlabs: Thank you for your feedback! the SD-OCT use an holographic grating based spectrometer. The camera used in the Ganymede and the Hyperion have 2048 Pixel whereas the cameras from the Callisto and the Telesto have 1024Pixel
mo_kamal  (posted 2011-11-29 20:10:21.0)
What kind of spectrometer is being used in the SD-OCT? is it reflective optics based / refractive optics based spectrometer? is the spectrometer build with 512 pixel CCD? thanks
tor  (posted 2010-12-09 15:56:07.0)
Response from Tor at Thorlabs to Jay: Thank you for your interest in our SD-OCT system. We include a LabVIEW and C-based software development kit with all of our 930-nm SD-OCT systems. Please do not hesitate to contact us if you have further inquiries.
jwang3  (posted 2010-12-08 21:09:29.0)
Hi, Do you have the LabVIEW and C-based Software Development Kits for the 110Khz system? Thanks Jay
Thorlabs  (posted 2010-09-08 21:47:04.0)
Response from Javier at Thorlabs to hs_kim: Thank you for your interest in our products. We will contact you directly with pricing and lead time information.
hs_kim  (posted 2010-09-08 12:29:35.0)
I wish to know the price a SD-OCT system. Item: 930 nm Spectral Domain Optical Coherence Tomography (SD-OCT) Imaging Systems (full system, with probe and S/W) price : ? delivery time : ?

Thorlabs offers a variety of OCT Imaging Systems to meet a range of application requirements. The OCT base unit and scan lens kit are key to OCT system performance. Significant performance characteristics, including axial resolution, A-Scan rate, and imaging depth, are entirely or strongly dependent on the design of the OCT base unit. The choice of scan lens kit determines other parameters, such as lateral resolution and field of view. Thorlabs offers a variety of OCT base units and scan lens kits that provide foundations for systems with a wide range of capabilities. The tables below present key performance parameters of our base units and include links to our other OCT imaging system pages. We encourage you to contact us directly at or via our online request form to discuss specific imaging requirements.

900 nm OCT Base Units

Base Unit Item #a CAL110 GAN210 GAN610 GAN220 GAN620
Series Name (Click for Link) Callisto Ganymede
Key Performance Feature(s) Laptop PC for
Maximum Portability
High Resolution Very High Resolution
General Purpose High Speed General Purpose High Speed
Center Wavelength 930 nm 930 nm 900 nm
Imaging Depthb (Air/Water) 1.7 mm / 1.3 mm 2.9 mm / 2.2 mm 2.7 mm / 2.0 mm 1.9 mm / 1.4 mm
Axial Resolutionb (Air/Water) 7.0 µm / 5.3 µm 6.0 µm / 4.5 µm 3.0 µm / 2.2 µm
A-Scan Line Rate 1.2 kHz 5.5 kHz to 36 kHz 5 kHz to 248 kHz 5.5 kHz to 36 kHz 5 kHz to 248 kHz
Sensitivity (Max)c 107 dB 101 dB 102 dB 101 dB 102 dB
OCT Type Spectral Domain
  • These Item #s are OCT base units that can be customized using a wide selection of OCT scanners, lens kits, and optional accessories.
  • Axial resolution and actual imaging depth are dependent on the optical properties of the sample being imaged.
  • Values for the Callisto and Ganymede systems are typical and were measured using a scanner with a common reference/sample path and 50% path split.

1300 nm OCT Base Units

Base Unit Item #a TEL210 TEL310 TEL220 TEL320 TEL210PS TEL220PS VEG210 VEG220
Series Name (Click for Link) Telesto Telesto PS-OCT Vega
Key Performance Feature(s) High Imaging Depth High Resolution High Imaging Depth High Resolution Long Imaging Range
General Purpose High Speed General Purpose High Speed Polarization-Sensitive Imaging General Purpose High Speed
Center Wavelength 1325 nm 1300 nm 1325 nm 1300 nm 1300 nm
Imaging Depthb (Air/Water) 7.0 mm / 5.3 mm 3.5 mm / 2.6 mm 7.0 mm / 5.3 mm 3.5 mm / 2.6 mm 11 mm / 8.3 mm 8.0 mm / 6.0 mm
Axial Resolutionb (Air/Water) 12 µm / 9.0 µm 5.5 µm / 4.2 µm 12 µm / 9.0 µm 5.5 µm / 4.2 µm 16 µm / 12 µm
A-Scan Line Rate 5.5 kHz to 76 kHz 10 kHz to 146 kHz 5.5 kHz to 76 kHz 10 kHz to 146 kHz 5.5 kHz to 76 kHz 5.5 kHz to 76 kHz 100 kHz 200 kHz
Sensitivity (Max)c 111 dB 109 dB 111 dB 109 dB 109 dB 109 dB 102 dB 98 dB
OCT Type Spectral Domain Swept Source
  • These Item #s are OCT base units that can be customized using a wide selection of OCT scanners, lens kits, and optional accessories.
  • Axial resolution and actual imaging depth are dependent on the optical properties of the sample being imaged.
  • Values for the Telesto systems are typical and were measured using a scanner with a common reference/sample path and 50% path split. Values measured for the Vega systems are typical and were measured using a scanner with a dual path setup.

Callisto Series Complete Preconfigured System

  • Complete Preconfigured 930 nm OCT Imaging System
  • High-Sensitivity Imaging (See Tables Below)
  • Fully Customizable Using Other Callisto Series Components

Thorlabs offers this complete, preconfigured Callisto OCT system, which is fully compatible with all Callisto Series OCT components. The CAL110C1 configuration features a center wavelength of 930 nm and is designed for high-sensitivity imaging applications.

This Callisto Series OCT system configuration is built completely from components sold in sections located lower on this page. This preconfigured system includes the three mandatory OCT system core components (the base unit, a scanning system with its reference length adapter, and a scan lens kit), as well as two optional accessories (scanner stand and translation stage). For more information about a component included in the preconfigured system, click on the component description in the table to the lower left to navigate down to the related section on this page.

For information about the CAL110C1 system or to inquire about custom configurations, please contact

Preconfigured System Included Components
System Item # CAL110C1
Base Unit CAL110
Scanning System OCTG-900 (Standard Scanner)
Scan Lens Kit OCT-LK3-BB
Reference Length Adapter OCT-RA3
Accessories: Stand and Stage OCT-STAND(/M) (Scanner Stand) and
OCT-XYR1(/M) (Translation Stage)
  • Click on the component description to navigate down to the related section on this page.
Preconfigured System Key Specifications
System Item # CAL110C1
Imaging Depth (Air/Water) 1.7 mm / 1.3 mm
Axial Resolution (Air/Water) 7.0 µm / 5.3 µm
Lateral Resolution 8 µm
A-Scan/Line Rate 1.2 kHz
Sensitivity 107 dB
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAL110C1 Support Documentation
CAL110C1Spectral Domain OCT System, 930 nm, 7.0 µm Resolution, 1.2 kHz
Lead Time

OCT Base Unit (Required OCT System Component)

Base Unit Item # CAL110
Center Wavelength 930 nm
Imaging Depth (Air/Water) 1.7 mm / 1.3 mm
Axial Resolution (Air/Water) 7.0 µm / 5.3 µm
A-Scan Line Rate 1.2 kHz
Sensitivitya 107 dB (at 1.2 kHz)
Maximum Pixels per A-Scan 512
Compatible Scanners OCTP-900(/M), OCTG-900, and OCTH-900
  • Typical Values Measured Using a Scanner with a Common Reference/Sample Path and 50% Path Split
Computer Specificationsa
Operating System Windows 7b, 64 Bit
Processor Dual Core, ≥2.5 GHz
Memory 4 GB
Hard Drive ≥250 GB
Data Acquisition USB
  • Computer Specifications Subject to Change
  • We are in the process of switching the pre-installed operating system; some computers may come with Windows 10 installed upon delivery. This will not affect the performance of the OCT software.
  • 930 nm High-Sensitivity Base Unit
  • 107 dB Sensitivity at 1.2 kHz A-Scan Rate
  • 1.7 mm Imaging Depth and 7 µm Axial Resolution

The imaging performance of any OCT system is largely dependent on the design and components incorporated into the base unit. All of Thorlabs’ OCT Base Units include an OCT engine, high-performance computer, pre-installed software, and a software development kit (SDK). For the Callisto OCT Base Unit, the engine is comprised of a superluminescent diode light source, scanning electronics, and a linear CCD array-based spectrometer for detection. The engine and detection components are integrated into a 420 mm x 320 mm x 149 mm (16.5" x 12.6" x 5.86") unit. For a fully operational system, one scanning option and a scan lens kit must be purchased along with a base unit (sold separately below). 

Thorlabs' CAL110 Base Unit is optimized for high sensitivity (107 dB) at an A-Scan line rate of 1.2 kHz. Thus, the Callisto is ideal for imaging static, in vitro samples that require good contrast to distinguish features. The CAL110 offers up to 1.7 mm imaging depth with 7 µm of axial resolution.

Scanning System and Scan Lens Kit Required
To be functional, an OCT system build must include
a base unit, a scanning system, and a scan lens kit.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAL110 Support Documentation
CAL110Callisto OCT Base Unit, 930 nm, 7.0 µm Resolution, 1.2 kHz
Lead Time

Scanning Systems (Required OCT System Component)

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Handheld OCT Scanner

Click to Enlarge

User-Customizable OCT Scanner

Click to Enlarge

Standard OCT Scanner
Scanner Type Item # Compatible
Base Unit
Standard Scannera OCTG-900 CAL110
User-Customizable Scanner OCTP-900(/M)
Handheld Scannerb OCTH-900
  • Scan an OCT Light Source Beam Across a Sample to Acquire 2D or 3D Images
  • Three Available Options
    • Standard Scanner for High Stability and Ease-of-Use
    • User-Customizable Scanners with Open Construction for Customization of Scan Path
    • Portable Handheld Scanner for Applications Requiring High Mobility

Thorlabs’ OCT Scanning Systems are designed to scan the OCT light source beam across a sample for 2D cross-sectional and 3D volumetric imaging. OCT applications can vary widely, from live animal imaging to industrial materials analysis, with each requiring a different set of scanning parameters. We currently offer three types of beam scanning systems for use with our Callisto Base Unit: standard, user-customizable, and handheld.

Each scanner contains an OCT interferometer with a sample arm and a reference arm. The reference arm of the OCT interferometer is placed near the sample and housed within the scanning system itself to guarantee the phase stability of the sample arm relative to the reference arm. To account for different sample distances and reflectivities (e.g., while imaging through water), the reference arm path length, as well as the reference arm intensity, is adjustable. To minimize image distortion caused by dispersion, our OCT systems are designed to optically match the reference and sample arm lengths to the greatest extent possible. Dispersion effects from the sample (e.g., imaging through water or glass) can be compensated for using the included ThorImage OCT software. For customers interested in dual-path setups, any of these scanners can be configured without a beamsplitter; please contact for more information.

All scanners are equipped with an integrated camera that can obtain real-time en face video of the sample during OCT measurements when used with our ThorImage OCT software (see the Software tab for details). Illumination of the sample is provided by a ring of user-adjustable white light LEDs around the exit aperture of each scanner.

Hand-Held OCT Probe
Click to Enlarge
OCTH-900 Handheld Scanner with OCTH-AIR30 Sample Z-Spacer
Scanning System and Scan Lens Kit RequiredTo be functional, an OCT system build must include a base unit, a scanning system, and a scan lens kit.

Standard Scanner
The OCTG-900 Standard Scanner is ideal for imaging applications that require a stable, easy-to-operate setup. The entire design of the standard scanner is contained within a rugged, light-tight housing that minimizes the risk of misalignment. The standard scanner is equipped with a reference path length distance indicator for ease-of-use during reference adjustments. A knob located at the top of the standard scanner allows for fine adjustments to the reference path length.

User-Customizable Scanner
The OCTP-900(/M) User-Customizable Scanner is designed with an open construction to enable easy customization of the optical beam path using Thorlabs' standard optomechanical components. This scanner features SM1 (1.035"-40) ports and 4-40 tapped holes at several locations that allow mounting of SM1-threaded or 30 mm cage-compatible components, respectively. The scan lens port is directly compatible with either M25 x 0.75 or SM1-threaded components, and can be converted to other thread standards, such as RMS (0.800"-36) via our selection of thread adapters. Additional scanning and non-scanning optical input/output ports are available for integration of a laser for fluorescence excitation or additional sample illumination.

Compact Handheld Scanner
The compact and lightweight OCTH-900 Handheld Scanner is specifically designed for applications requiring high mobility. Easy access buttons located directly on the scanner enable fingertip control of our ThorImage OCT Software. Users can program each button from a selection of imaging and acquisition software controls and the software uses visual and audio feedback for button presses. The OCTH-900 features a removable cover under the handle that provides access to the reference length and intensity settings. Compatible scan lens kits and sample z-spacers for the OCTH-900 are sold below; z-spacers help maintain the correct working distance when using the handheld scanner. Please note that due to the limitations of the internal MEMS scanner, the frame rate (i.e., B-Scan rate) is limited to 25 frames per second when using the handheld scanner.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
OCTP-900 Support Documentation
OCTP-900Customer Inspired! User-Customizable Scanner for 900 nm & 930 nm SD-OCT Systems, Imperial
Lead Time
+1 Qty Docs Part Number - Universal Price Available
OCTG-900 Support Documentation
OCTG-900Standard Scanner for 900 nm & 930 nm SD-OCT Systems
Lead Time
OCTH-900 Support Documentation
OCTH-900Handheld Scanner for 900 nm & 930 nm SD-OCT Systems
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OCTP-900/M Support Documentation
OCTP-900/MCustomer Inspired! User-Customizable Scanner for 900 nm & 930 nm SD-OCT Systems, Metric
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Scan Lens Kit (Required OCT System Component)

The cross-section image below of a banana was taken with the OCT-LK3-BB scan lens kit using a Callisto Series OCT system. Choose a scan lens kit that provides the right resolution and focal length for your application.

OCT-LK3-BB (36 mm Focal length)
High-Resolution OCT
Click to Enlarge

Magnification: 5X
Scan Region: 3 mm x 1.7 mm
Lateral Resolution: 8 µm
Scanning System and Scan Lens Kit RequiredTo be functional, an OCT system build must include a base unit, a scanning system, and a scan lens kit.
  • Telecentric Scan Lenses Provide a Flat Imaging Plane
  • Lens AR Coated for 800 - 1100 nm
  • Scan Lens Kits for Standard / User-Customizable Scanners Include
    • Telecentric Scan Lens
    • Illumination Tube
    • IR Card
    • Calibration Target
  • Compact Scan Lens Kits Designed for the OCTH-900 Handheld Scanner with Integrated Scan Lens and Illumination Ring

Thorlabs’ Scan Lens Kits enable easy exchange of scan lenses in an OCT system, providing the flexibility to tailor imaging resolution or working distance for each application. Based on our line of OCT telecentric scan lenses, these lens kits minimize image distortion without extensive post-image processing and maximize coupling of the light scattered or emitted from the sample surface into the detection system. As seen in the table below, we offer scan lens kits compatible with the standard (Item # OCTG-900) and user-customizable (Item # OCTP-900) scanners, as well as two lens kits compatible with the handheld scanner (Item # OCTH-900). 

Each kit includes a telecentric scan lens, illumination tube, IR card, and calibration target. The included illumination tube serves as a light guide that channels light from the LED illumination ring down to the sample area. The IR card and calibration target are provided for calibration of the scanning mirror and lens kit, ensuring the best image quality when swapping between scan lenses.

Click Image to Enlarge
Design Wavelength 900 nm / 930 nm 900 nm / 930 nm
Compatible Scanner OCTG-900 (Standard) or OCTP-900 (User-Customizable) OCTH-900 Handheld Scanner
Lateral Resolutiona 4 µm 8 µm 12 µm 9 µm 14 µm
Focal Length 18 mm 36 mm 54 mm 20 mm 30 mm
Working Distance 3.4 mm (with Tube)b
7.5 mm (without Tube)
24.9 mm (with Tube)b
25.1 mm (without Tube)
41.6 mm (with Tube)b
42.3 mm (without Tube)
12 mm 22 mm
Field of View 6 mm x 6 mm 10 mm x 10 mm 16 mm x 16 mm Ø8 mm Ø10 mm
Lens Threading M25 x 0.75 M25 x 0.75 M25 x 0.75 M20 x 0.5 (For Z-Spacer)
M14 x 0.5 (For OCTH-900)
  • 1/eBeam Diameter at Focus
  • The illumination tube is user-removable.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OCT-LK2-BB Support Documentation
OCT-LK2-BBOCT Scan Lens Kit, 18 mm FL, 900 nm / 930 nm
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OCT-LK3-BB Support Documentation
OCT-LK3-BBOCT Scan Lens Kit, 36 mm FL, 900 nm / 930 nm
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OCT-LK4-BB Support Documentation
OCT-LK4-BBOCT Scan Lens Kit, 54 mm FL, 900 nm / 930 nm
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OCTH-LK20-BB Support Documentation
OCTH-LK20-BBOCT Scan Lens Kit for OCTH-900, 20 mm FL, 900 nm / 930 nm
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OCTH-LK30-BB Support Documentation
OCTH-LK30-BBOCT Scan Lens Kit for OCTH-900, 30 mm FL, 900 nm / 930 nm
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Reference Length Adapters (Required for Standard Scanners)

Item #a Compatible Scan Lens Kit
  • Multiple reference adapters can be purchased for rapid switching between scan lens kits.
  • Arm Adapters for Matching Reference Path Length to the Sample Path Length
  • Use Multiple Reference Adapters for Rapid Switching Between Scan Lens Kits
  • Must be Purchased with Standard Scanner (Item # OCTG-900)

These adapters adjust the reference arm path length within the OCTG-900 Standard Scanner to match the sample path length of the scan lens used. Choose from three options that are compatible with the scan lens kits sold above. Reference length adapters also enable the user to quickly swap between different scan lens kits without going through extensive adjustments during each switch. The table to the right provides a compatibility list to help select the appropriate reference adapters.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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OCT-RA2 Support Documentation
OCT-RA2Length Adapter for SD-OCT Standard Scanner & OCT-LK2(-BB) Scan Lens Kit
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OCT-RA3 Support Documentation
OCT-RA3Length Adapter for SD-OCT Standard Scanner & OCT-LK3(-BB) Scan Lens Kit
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OCT-RA4 Support Documentation
OCT-RA4Length Adapter for SD-OCT Standard Scanner & OCT-LK4(-BB) Scan Lens Kit
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Sample Z-Spacers (Optional Accessories)

Click to Enlarge
Z-Spacers for the OCTG-900 and OCTP-900(/M) Scanners

Click to Enlarge
Z-Spacers for the OCTH-900 Handheld Scanner
  • Sample Z-Spacers Position Scanner at Optimal Working Distance From Sample
  • Ring (Air) and Immersion (Liquid) Z-Spacers Available
  • Two Z-Spacers Recommended for Use with OCTH-900 Handheld Scanner

Thorlabs offers both ring and immersion style sample Z-spacers that enable optimal positioning of a scanning system relative to the sample. The OCT-AIR3, OCT-IMM3, and OCT-IMM4 Z-Spacers feature knurled rings that allow the spacing distance to be adjusted and locked in place for increased stability. Several Z-spacer options are available; please see the table below for compatibility with our scanners and lens kits.

Additionally, we offer two ring-style Z-spacers that are designed specifically for the OCTH-900 Handheld Scanner; these spacers greatly assist in maintaining the correct sample working distance when using the handheld scanner. The spacing distance on the OCTH-AIR20 and OCTH-AIR30 Z-Spacers can be adjusted by rotating the spacer.

Our ring-style Z-spacers provide a distance guide between the scanner and sample. The sample is in contact with the ring-shaped tip of the spacer and should only be used when air is the scanning medium. In contrast, our immersion spacers are equipped with a glass plate that contacts the sample surface within the scanning area. Unlike the ring-style spacers, immersion spacers enable access to samples contained within a liquid environment while also providing sample stabilization. Better index matching and a tilted glass plate also help reduce strong back reflections from the sample surface and enhances the contrast of the image.

Item #a Type Adjustable Adjustment Range Lockable Compatible
Scan Lens Kit
OCT-AIR3 Ring (Air) Yes +3.5 mm / -1.0 mm Yes OCTG-900
OCT-IMM3 Immersion Yes +3.4 mm / -1.1 mm Yes
OCT-IMM4 Immersion Yes +1.0 mm / -17.0 mm Yes OCT-LK4-BB
OCTH-AIR20 Ring (Air) Yes ±4 mm No OCTH-900a OCTH-LK20-BB
OCTH-AIR30 Ring (Air) Yes ±2 mm No OCTH-LK30-BB
  • We recommend purchasing a sample Z-spacer if using the OCTH-900 handheld scanner.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OCT-AIR3 Support Documentation
OCT-AIR3Ring-Style Sample Z-Spacer for OCT-LK3(-BB) Scan Lens Kit
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OCT-IMM3 Support Documentation
OCT-IMM3Immersion-Style Sample Z-Spacer for OCT-LK3(-BB) Scan Lens Kit
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OCT-IMM4 Support Documentation
OCT-IMM4Immersion-Style Sample Z-Spacer for OCT-LK4(-BB) Scan Lens Kit
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OCTH-AIR20 Support Documentation
OCTH-AIR20Ring-Style Sample Z-Spacer for OCTH-LK20(-BB) Scan Lens Kit
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OCTH-AIR30 Support Documentation
OCTH-AIR30Ring-Style Sample Z-Spacer for OCTH-LK30(-BB) Scan Lens Kit
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Scanner Stand (Optional Accessory)

Click for Details

The focus block can be rotated 45° to move the scanner head away from the sample.
  • Recommended Stand for Mounting Standard or User-Customizable Scanners
  • Focus Block with Coarse/Fine Z-Axis Travel on Ø1.5" Stainless Steel Post
  • 12" x 14" (300 mm x 350 mm) Aluminum Breadboard with 1/4"-20 (M6) Tapped Holes

For convenient mounting of our Standard or User-Customizable Scanners, we offer a scanner stand that is ideal for use in vibration-sensitive studies such as angiography. It consists of a post-mounted focus block with knobs that provide both coarse (40 mm/rev) and fine (225 µm/rev) z-axis travel. A rotation and height collar underneath the focus block allows it to rotate 45° in order to move the scanner head away from the sample to make adjustments.

The focus block attaches to a 12" x 14" (300 mm x 350 mm) aluminum breadboard via the included Ø1.5" post. The aluminum breadboard has side grips and rubber feet for easy lifting and transportation. There is an array of 1/4"-20 (M6) tapped holes for mounting optomechanics. Four extra 1/4"-20 (M6) tapped holes allow the mounting of the OCT-XYR1 Translation Stage (sold below) to the OCT-STAND and the OCT-XYR1/M Translation Stage to the OCT-STAND/M directly underneath the scan lens. A 1/4"-20 (M6) counterbore is also provided for securing the Ø1.5" post.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
OCT-STAND Support Documentation
OCT-STANDStand for Standard and User-Customizable OCT Scanning Systems, 1/4"-20 Tapped Holes
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+1 Qty Docs Part Number - Metric Price Available
OCT-STAND/M Support Documentation
OCT-STAND/MStand for Standard and User-Customizable OCT Scanning Systems, M6 Tapped Holes
5-8 Days

Translation Stage (Optional Accessory)

Click to Enlarge
The cover plate is removable for access to tapped holes and the SM1-threaded central hole.
Horizontal Load Capacity (Max) 10 lbs (4.5 kg)
Mounting Platform Dimensions Ø4.18" (Ø106 mm)
Stage Height 1.65" (41.8 mm)
Linear Translation Range 1/2" (13 mm)
Travel per Revolution 0.025" (0.5 mm)
Graduation 0.001" (10 µm) per Division
  • Optional Translation Stage with 0.5" (13 mm) of XY Travel and 360° Rotation
  • Includes Cover Plate for Sample Mounting
  • Can Mount Optomechanics by Removing Cover Plate

Precise translation and rotation are often required for optimal positioning of a sample before and during OCT imaging. The OCT-XYR1(/M) is an XY linear translation stage with a rotating platform and solid plate for sample mounting and easy cleaning. The OCT-XYR1 or OCT-XYR1/M stage can be secured to the OCT-STAND or OCT-STAND/M, respectively, using the 1/4" (M6) counterbores at the corners. The top plate is removable for access to 4-40, 8-32 (M4), and 1/4"-20 (M6) tapped holes and an SM1-threaded (1.035"-40) central hole for mounting optomechanical components. The XYR1A Solid Sample Plate can be purchased separately as a direct replacement for the top plate. 

The X and Y micrometers offer 1/2" (13 mm) of travel with graduations every 0.001" (10 µm). The stage's rotation and translation can be freely changed without compromising the stability of attached components. An engraved angular scale along the outer edge of the stage's rotating platform allows the user to set the angular orientation of the stage, which can then be fixed using the 5/64" (2 mm) hex locking setscrew. Locking the rotation of the stage does not prevent XY translation using the actuators. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
OCT-XYR1 Support Documentation
OCT-XYR1XY Stage with Solid Top Plate, 1/2" Travel, 360° Rotation, Imperial Taps
5-8 Days
+1 Qty Docs Part Number - Metric Price Available
OCT-XYR1/M Support Documentation
OCT-XYR1/MXY Stage with Solid Top Plate, 13 mm Travel, 360° Rotation, Metric Taps
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