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Air-Spaced Doublet Collimators - FC/PC, FC/APC, & SMA


  • Multi-Element Lens Design for Diffraction-Limited Performance
  • Options for FC/PC, FC/APC, or SMA Connectors
  • Collimated Beam Diameters Range from 6.4 to 8.0 mm
  • Simplifies Fiber-Coupled Detection Systems

F810FC-780

780 nm, Focal Length: 36.01 mm

F810SMA-2000

2.0 µm, Focal Length: 37.52 mm

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F810APC-543

543 nm, Focal Length: 34.74 mm

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F810FC-780 in AD15F Adapter
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F810FC-780 in an AD15F Adapter
Quick Links to Available Wavelengths
543 nm
635 nm
780 nm
842 nm
1064 nm
1310 nm
1550 nm
2.0 µm

Features

  • Fiber Collimatiors with FC/PC (2.1 mm Wide Key), FC/APC (2.2 mm Wide Key), and SMA Connectors
  • Factory-Aligned Collimation Package for Wavelengths from 543 nm to 2 µm
  • Simplifies Free-Space Laser to Fiber Coupling
  • Multi-Element Lens Design for Diffraction-Limited Performance
  • Lens Material: N-SF6 or Equivalent
  • Non-Magnetic Stainless Steel Housing

The F810 Series Fiber Collimation Packages are pre-aligned to collimate a laser beam propagating from the tip of an FC/PC, FC/APC, or SMA terminated fiber with diffraction-limited performance at the design wavelength. Since the F810 Series fiber collimators do not have any movable parts, they are compact and not susceptible to misalignment. Due to chromatic aberration, the effective focal length (EFL) of the doublet lens is wavelength dependent. As a result, these collimators will only perform optimally at the design wavelength. The doublet lens, which features an AR coating that minimizes surface reflections, is factory aligned for each design wavelength so that it is one focal length away from a fiber tip inserted into the collimator. Additionally, the receptacles for the FC/APC versions are angled so that light exiting the fiber enters the collimator perpendicular to the focal plane.

We recommend using the F810APC and F810FC collimation packages with our AR-coated single mode fiber optic patch cables. These cables feature an antireflective coating on one fiber end for increased transmission and improved return loss at the fiber-to-free-space interface. F810SMA fiber collimation packages are optimized for single mode fibers and are compatible with our SMA-terminated hybrid single mode fiber optic patch cables. Alternatively, our large selection of standard fiber patch cables can also be used.

Alternatives
We can align collimation packages at custom wavelengths if a standard version is not suitable for your application. We also offer a line of adjustable collimation packages called FiberPorts that are well suited for a wide range of wavelengths and are ideal solutions for adjustable, compact fiber couplers. For other collimation and coupling options, please contact Tech Support.

Theoretical Approximation of the Divergence

The divergence angle listed in the specifications tables below is the theoretical full-angle divergence when using the fiber collimator at its design wavelength with the listed fiber. Simulations of the theoretical divergence of the F810 collimators at wavelengths other than the design wavelengths are shown below. Similarly, the beam diameter as a function of propogration distance was simulated for each of our F810 collimators at the design wavelength, assuming input from the design fiber and a Gaussian intensity profile. 

The graphs below show the reflectance with respect to wavelength of the AR coatings used on the lens surfaces in our F810 series collimators. The blue shaded region indicates the wavelength range specified for each coating. The table below details the AR coating designations with their corresponding wavelength ranges and average reflectance. Transmission for the N-SF6 lens material is also provided.

AR Coating Information
Coating Designation A B 1064 C D
Coating Range 350 - 700 nm 650 - 1050 nm 1054 - 1074 1050 - 1620 nm 1.8 - 2.4 μm
Reflectance Ravg < 0.5% Ravg < 0.5% Ravg < 0.25% Ravg < 0.5% Ravg < 0.5%




Theoretical Approximation of the Divergence Angle

The full-angle beam divergence listed in the specifications tables is the theoretically-calculated value associated with the fiber collimator. This divergence angle is easy to approximate theoretically using the formula below as long as the light emerging from the fiber has a Gaussian intensity profile. Consequently, the formula works well for single mode fibers, but it will underestimate the divergence angle for multimode (MM) fibers since the light emerging from a multimode fiber has a non-Gaussian intensity profile.

The Full Divergence Angle (in degrees) is given by

Divergence Angle Equation

where MFD is the mode field diameter and f is the focal length of the collimator. (Note: MFD and f must have the same units in this equation).

Example:

When the F220FC-A collimator (f ≈ 11.0 mm; not exact since the design wavelength is 543 nm) is used to collimate 515 nm light emerging from a 460HP fiber (MFD = 3.5 µm), the divergence angle is approximately given by

θ ≈ (0.0035 mm / 11.0 mm) x (180 / pi) = 0.018°.

When the beam divergence angle was measured for the F220FC-A collimator, a 460HP fiber was used with 543 nm light. The result was a divergence angle of 0.018°.

Theoretical Approximation of the Output Beam Diameter

The output beam diameter can be approximated from

Output Beam Diameter Equation

where λ is the wavelength of light being used, MFD is the mode field diameter, and f is the focal length of the collimator. (Note: MFD and f must have the same units in this equation).

Example:

When the F240FC-1550 collimator (f = 8.18 mm) is used with the P1-SMF28E-FC-1 patch cable (MFD = 10.4 µm) and 1550 nm light, the output beam diameter is

d ≈ (4)(0.00155 mm)[8.18 mm / (pi · 0.0104 mm)] = 1.55 mm.

Theoretical Approximation of the Maximum Waist Distance

The maximum waist distance, which is the furthest distance from the lens the waist can be located in order to maintain collimation, may be approximated by

Max Waist Distance Calculation

where f is the focal length of the collimator, λ is the wavelength of light used, and MFD is the mode field diameter. (Note: MFD and f must have the same units in this equation).

Example:

When the F220FC-532 collimator (f = 10.9 mm) is used with the P1-460B-FC-1 patch cable (MFD ≈ 4.0 µm; calculated approximate value) and 532 nm light, then the maximum waist distance is approximately

zmax ≈ 10.9 mm + [2 · (10.9 mm)2 · 0.000532 mm] / [pi · (0.004 mm)2] = 2526 mm.

Damage Threshold Specifications
Item # Suffix Damage Threshold
-543 7.5 J/cm2 (532 nm, 10 ns, 10 Hz, Ø0.362 mm)
-1064 7.5 J/cm2 (1064 nm, 10 ns, 10 Hz, Ø0.442 mm)

Damage Threshold Data for Thorlabs' Air-Spaced Doublet Collimators

The specifications to the right are measured data for a selection of Thorlabs' air-spaced doublet collimators. Damage threshold specifications are constant for these collimators, regardless of the connector type.

 

Laser Induced Damage Threshold Tutorial

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 and ISO 21254 specifications.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence # of Tested Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm):

CW Wavelength Scaling

While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1998).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).


Posted Comments:
Tyler  (posted 2009-01-27 14:45:07.0)
A response from Tyler at Thorlabs to femtor: The collimator will not alter the polarization of the light. So yes, the F810APC-1550 can be used in a system where maintaining the polarization of the light is important. Thank you for submitting your question.
femtor  (posted 2009-01-11 10:12:30.0)
Dear Sir: I wonder if the F810APC-1550 collimator can be used in a polarization maintaining optical system. If I use the PM FC/APC patch cable with APC-Style connector (P3-1550PM-FC-2) to connect this collimator to a PM optical system, will the system still be PM?
Tyler  (posted 2008-11-05 16:03:36.0)
A response from Tyler at Thorlabs to makoto.chang: These collimation packages can indeed be used to couple light into an optical fiber. A member of our technical support department will contact you for more details about your application and some possible solutions. Thank you for considering a Thorlabs collimation package.
makoto.chang  (posted 2008-11-04 21:22:51.0)
Dear Sir: I saw the description in your website, "These packages can also be used to couple a free space laser beam into an optical fiber, please call our technical support group if you would like assistance with this application." Can these products be used for optical spectrum measurement of 1550nm laser chip on wafer? Can you give me more information and suggest a part number for this application? Thanks. Makoto Chang
techsupport  (posted 2008-08-06 17:43:36.0)
We can certainly design a new product for such an application and this kind of input is extremly helpful for us. If you have a need for an F810 collimator that could be used around 405nm please let us know and we will look for a custom solution on short term. In addition any thoughts or comments with respect to the general need for such an item are highly welcome and will help us to decide if it should be a custom build solution or a product that is offered as a standard part which ships same day from stock.
ghegenbart  (posted 2008-07-31 10:22:45.0)
A response from Gerald at Thorlabs: The NA of the F810FC-543 collimation package optics is 0.26. Thus using it with a 0.27 NA fiber will not lead to optimum results. If you use the package with the AFS50/125Y multi mode fiber having 0.22 NA the beam diameter just behind the optics will be about 15 mm at a divergence of about 0.72 mrad (at 543 nm). Furthermore usage of the F810 type collimation packages at 405 nm is not recommended. The reasons are a decrease of transmission of the glass type used for one of the lenses and an increased reflection of the AR coating below 420 nm. Therefore we do not offer doing a special alignement of these collimation packages for 405 nm.
thomas.juffmann  (posted 2008-07-30 10:54:47.0)
Hello, how much would the divergence increase if I used a multimode fiber (e.g. M31L03 )? How well would that work for a 405nm laser beam? Thank you for your help, Thomas
Tyler  (posted 2008-06-03 10:21:23.0)
A response from Tyler at Thorlabs The F810APC-1550 collimator is factory aligned for 1550 nm light and as a result will not produce a well collimated beam when used with 1650 nm light. You could contact our technical support staff and request a quote for a collimator aligned for 1650 nm or try a CFC-5-C. The CFC-5-C allows the user to adjust the position of the lens along the optic axis for optimum collimation of the beam. In addition, the lens used in the CFC-5-C has an NA of 0.53, which is suitable for use with a fiber that has a divergence angle of 30 degrees. The AR coating on the lens used in the CFC-5-C is only specified to 1550 nm. However, the reflections are still less than 0.5% per surface at 1650 nm so it is reasonable to use the collimator at 1650 nm.
hongxingqi  (posted 2008-06-02 03:36:15.0)
I need collimate a DFB laser beam, the wavelength of which is 1650nm. The angle of divergence for my DFB laser is 30 degree, and the fiber connector is FC/APC, I wonder if the F810APC-1550 is right for my laser.
technicalmarketing  (posted 2007-11-19 08:58:48.0)
The F810SMA-543 collimators can be purchased online or by calling our sales support staff at 1-973-579-7227.
zwleevivi  (posted 2007-11-17 00:16:16.0)
we need two F810SMA-543 collimators,how should we get them as quickly as we can.please send an e-mail to me ,thank you.Chutianlaser Wuhan China vivilee

Fiber Collimator Selection Guide

Click on the collimator type or photo to view more information about each type of collimator.

Type   Description
Fixed FC, APC, or SMA Fiber Collimators Fixed SMA Fiber Collimator These fiber collimation packages are pre-aligned to collimate light from an FC/PC-, FC/APC-, or SMA-terminated fiber. Each collimation package is factory aligned to provide diffraction-limited performance for wavelengths ranging from 405 nm to 4.55 µm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the aspheric lens to have a wavelength dependence.
Air-Spaced Doublet, Large Beam Collimators Air-Spaced Doublet Fiber Collimator For large beam diameters (Ø6.6 - Ø8.5 mm), Thorlabs offers FC/PC, SMA, and FC/APC air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA-terminated fiber and provide diffraction-limited performance at the design wavelength.
Adjustable Fiber Collimators Adjustable Fiber Collimator These collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest.
Zoom Fiber Collimators Zoom Fiber Collimator These collimators provide a variable focal length between 6 and 18 mm, while maintaining the collimation of the beam. As a result, the size of the beam can be changed without altering the collimation. This universal device saves time previously spent searching for the best suited fixed fiber collimator and has a very broad range of applications. They are offered with FC/PC, FC/APC, or SMA905 connectors with three different antireflection wavelength ranges to choose from.
Large Beam Fiber Collimators large beam collimators Thorlabs' Large-Beam Fiber Collimators are designed with an effective focal length (EFL) of 40 mm or 80 mm over three different wavelength ranges and are available with FC/PC or FC/APC connectors. A four-element, air-spaced lens design produces a superior beam quality (M2 close to 1) and less wavefront error when compared to aspheric lens collimators. As a result, these collimators are very flexible; they can be used as free-space collimator or coupler. They may also be used over a long distance in pairs, which allows the free-space beam to be manipulated prior to entering the second collimator and may be useful in long-distance communications applications.
FiberPorts Fiberport Fiber Collimator These compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric or achromatic lens is available with three different AR coatings and has five degrees of alignment adjustment (3 translational and 2 pitch). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.
Triplet Collimators Triplet Fiber Collimator Thorlabs' High Quality Triplet Fiber Collimation packages use air-spaced triplet lenses that offer superior beam quality performance when compared to aspheric lens collimators. The benefits of the low-aberration triplet design include an M2 term closer to 1 (Gaussian), less divergence, and less wavefront error.
Reflective Collimators Reflective Fiber Collimator Thorlabs' metallic-coated Reflective Collimators are based on a 90° off-axis parabolic mirror. Mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. Our reflective collimators are ideal for single-mode fiber.
Pigtailed Collimators Pigtailed Fiber Collimator Our pigtailed collimators come with one meter of either single mode or multimode fiber, have the fiber and AR-coated aspheric lens rigidly potted inside the stainless steel housing, and are collimated at one of six wavelengths: 532, 830, 1030, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength.
GRIN Fiber Collimators GRIN Fiber Collimator Thorlabs offers gradient index (GRIN) fiber collimators that are aligned at a variety of wavelengths from 630 to 1550 nm and have either FC terminated, APC terminated, or unterminated fibers. Our GRIN collimators feature a Ø1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard single mode or graded-index multimode fibers.
GRIN Lenses GRIN Lens These graded-index (GRIN) lenses are AR coated for applications at 630, 830, 1060, 1300, or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light. Our GRIN lenses are designed to be used with our Pigtailed Glass Ferrules and GRIN/Ferrule sleeves.

543 nm Air-Spaced Doublet Collimator Packages

Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-543 543 nm 350 - 700 nm (A) 6.4 0.006° 0.26 34.74 7.5 J/cm2
(532 nm, 10 ns, 10 Hz, Ø0.362 mm
FC/APC AD15F, AD15NT
F810FC-543 543 nm 350 - 700 nm (A) 6.4 0.006° 0.26 34.74 7.5 J/cm
(532 nm, 10 ns, 10 Hz, Ø0.362 mm)
FC/PC AD15F, AD15NT
F810SMA-543 543 nm 350 - 700 nm (A) 6.4 0.006° 0.26 34.74 7.5 J/cm2
(532 nm, 10 ns, 10 Hz, Ø0.362 mm)
SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 543 nm with 460HP fiber.
  • Theoretical full-angle beam divergence at 543 nm with 460HP fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
F810APC-543 Support Documentation
F810APC-543NEW!543 nm FC/APC Collimation Package, NA = 0.26, f = 34.74 mm
$255.00
3-5 Days
F810FC-543 Support Documentation
F810FC-543543 nm FC/PC Collimation Package, NA = 0.26, f = 34.74 mm
$224.40
Today
F810SMA-543 Support Documentation
F810SMA-543543 nm SMA Collimation Package, NA = 0.26, f = 34.74 mm
$224.40
Today

635 nm Air-Spaced Doublet Collimator Packages

Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-635 635 nm 350 - 700 nm (A) 6.7 0.007° 0.25 35.41 - FC/APC AD15F, AD15NT
F810FC-635 635 nm 350 - 700 nm (A) 6.7 0.007° 0.25 35.41 - FC/PC AD15F, AD15NT
F810SMA-635 635 nm 350 - 700 nm (A) 6.7 0.007° 0.25 35.41 - SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 635 nm with SM600 fiber.
  • Theoretical full-angle beam divergence at 635 nm with SM600 fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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F810APC-635 Support Documentation
F810APC-635NEW!635 nm FC/APC Collimation Package, NA = 0.25, f = 35.41 mm
$255.00
Today
F810FC-635 Support Documentation
F810FC-635635 nm FC/PC Collimation Package, NA = 0.25, f = 35.41 mm
$224.40
Today
F810SMA-635 Support Documentation
F810SMA-635635 nm SMA Collimation Package, NA = 0.25, f = 35.41 mm
$224.40
Today

780 nm Air-Spaced Doublet Collimator Packages


Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-780 780 nm 650 - 1050 nm (B) 7.5 0.008° 0.25 36.01 - FC/APC AD15F, AD15NT
F810FC-780 780 nm 650 - 1050 nm (B) 7.5 0.008° 0.25 36.01 - FC/PC AD15F, AD15NT
F810SMA-780 780 nm 650 - 1050 nm (B) 7.5 0.008° 0.25 36.01 - SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 780 nm with 780HP fiber.
  • Theoretical full-angle beam divergence at 780 with 780HP fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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F810APC-780 Support Documentation
F810APC-780780 nm FC/APC Collimation Package, NA = 0.25, f = 36.01 mm
$255.00
Today
F810FC-780 Support Documentation
F810FC-780780 nm FC/PC Collimation Package, NA =0.25, f = 36.01 mm
$224.40
Today
F810SMA-780 Support Documentation
F810SMA-780780 nm SMA Collimation Package, NA = 0.25, f = 36.01 mm
$224.40
Today

842 nm Air-Spaced Doublet Collimator Packages


Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-842 842 nm 650 - 1050 nm (B) 7.8 0.008° 0.25 36.18 - FC/APC AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 842 nm with 780HP fiber.
  • Theoretical full-angle beam divergence at 842 nm with 780HP fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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F810APC-842 Support Documentation
F810APC-842842 nm FC/APC Collimation Package, NA = 0.25, f = 36.18 mm
$255.00
Today

1064 nm Air-Spaced Doublet Collimator Packages


Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-1064 1064 nm 1050 - 1074 nm (1064) 8.0 0.010° 0.25 36.60 7.5 J/cm2
(1064 nm, 10 ns, 10 Hz, Ø0.442 mm)
FC/APC AD15F, AD15NT
F810FC-1064 1064 nm 1050 - 1074 nm (1064) 8.0 0.010° 0.25 36.60 7.5 J/cm2
(1064 nm, 10 ns, 10 Hz, Ø0.442 mm)
FC/PC AD15F, AD15NT
F810SMA-1064 1064 nm 1050 - 1074 nm (1064) 8.0 0.010° 0.25 36.60 7.5 J/cm2
(1064 nm, 10 ns, 10 Hz, Ø0.442 mm)
SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 1064 nm with SM980-5.8-125 fiber.
  • Theoretical full-angle beam divergence at 1064 nm with SM980-5.8-125 fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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F810APC-1064 Support Documentation
F810APC-1064Customer Inspired! 1064 nm FC/APC Collimation Package, NA = 0.25, f = 36.60 mm
$255.00
Today
F810FC-1064 Support Documentation
F810FC-10641064 nm FC/PC Collimation Package, NA = 0.25, f = 36.60 mm
$224.40
Today
F810SMA-1064 Support Documentation
F810SMA-10641064 nm SMA Collimation Package, NA = 0.25, f = 36.60 mm
$224.40
Today

1310 nm Air-Spaced Doublet Collimator Packages


Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-1310 1310 nm 1050 - 1620 nm (C) 6.7 0.014° 0.24 36.90 - FC/APC AD15F, AD15NT
F810FC-1310 1310 nm 1050 - 1620 nm (C) 6.7 0.014° 0.24 36.90 - FC/PC AD15F, AD15NT
F810SMA-1310 1310 nm 1050 - 1620 nm (C) 6.7 0.014° 0.24 36.90 - SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 1310 nm with SMF-28e fiber.
  • Theoretical full-angle beam divergence at 1310 nm with SMF-28e fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
F810APC-1310 Support Documentation
F810APC-13101310 nm FC/APC Collimation Package, NA = 0.24, f = 36.90 mm
$255.00
Today
F810FC-1310 Support Documentation
F810FC-13101310 nm FC/PC Collimation Package, NA = 0.24, f = 36.90 mm
$224.40
Today
F810SMA-1310 Support Documentation
F810SMA-13101310 nm SMA Collimation Package, NA = 0.24, f = 36.90 mm
$224.40
Today

1550 nm Air-Spaced Doublet Collimator Packages


Item # Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-1550 1550 nm 1050 - 1620 nm (C) 7.0 0.016° 0.24 37.13 - FC/APC AD15F, AD15NT
F810FC-1550 1550 nm 1050 - 1620 nm (C) 7.0 0.016° 0.24 37.13 - FC/PC AD15F, AD15NT
F810SMA-1550 1550 nm 1050 - 1620 nm (C) 7.0 0.016° 0.24 37.13 - SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength.For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 1550 nm with SMF-28e fiber.
  • Theoretical full-angle beam divergence at 1550 nm with SMF-28e fiber. 
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
F810APC-1550 Support Documentation
F810APC-15501550 nm FC/APC Collimation Package, NA = 0.24, f = 37.13 mm
$255.00
Today
F810FC-1550 Support Documentation
F810FC-15501550 nm FC/PC Collimation Package, NA = 0.24, f = 37.13 mm
$224.40
Today
F810SMA-1550 Support Documentation
F810SMA-15501550 nm SMA Collimation Package, NA = 0.24, f = 37.13 mm
$224.40
Today

2.0 µm Air-Spaced Doublet Collimator Packages

Item #
Alignmenta
Wavelength
AR Coatingb Dc θd Divergence
Plot
NALENS f
(mm)
Damage Threshold Connector
Type
Suggested
Adapters
F810APC-2000 2.0 µm 1.8 - 2.4 µm (D) 7.3 0.02° 0.24 37.52 - FC/APC AD15F, AD15NT
F810FC-2000 2.0 µm 1.8 - 2.4 µm (D) 7.3 0.02° 0.24 37.52 - FC/PC AD15F, AD15NT
F810SMA-2000 2.0 µm 1.8 - 2.4 µm (D) 7.3 0.02° 0.24 37.52 - SMA AD15F, AD15NT
  • For optimal collimation these packages should be used at the alignment wavelength. For some applications, they may also be used at other wavelengths within the AR coating range. Please contact Tech Support for custom-alignment packages.
  • For data on Thorlabs' standard AR coatings, refer to the AR Coatings tab above.
  • Collimated Beam Diameter: Theoretical 1/e2 diameter at 1 focal length from lens at 2000 nm with SM2000 fiber.
  • Theoretical full-angle beam divergence at 2000 nm with SM2000 fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
F810APC-2000 Support Documentation
F810APC-20002.0 µm FC/APC Collimation Package, NA = 0.24, f = 37.52 mm
$255.00
Today
F810FC-2000 Support Documentation
F810FC-20002.0 µm FC/PC Collimation Package, NA = 0.24, f = 37.52 mm
$224.40
Today
F810SMA-2000 Support Documentation
F810SMA-20002.0 µm SMA Collimation Package, NA = 0.24, f = 37.52 mm
$224.40
Today
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