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Broadband Halogen Fiber Optic Illuminator


  • 150 W High-Output Halogen Lamp with Variable Intensity Control
  • 91 cm (36") Long Fiber Bundle Included
  • Optional Accessories Include Gooseneck Fiber Bundles, Microscope Ring Illuminator, and Collimation Packages

OSL2COL

Collimation Package (Shown Attached to OSL2YFB Fiber Bundle)

FRI61F50

Microscope Ring Illuminator

Application Idea

OSL2YFB Gooseneck Y-Bundle with the OSL2 Light Source

High-Intensity Fiber-Coupled Illuminator, Fiber Bundle Included

OSL2

Related Items


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OSL2 Emission
Click to Enlarge

Click to Download Raw Data
This spectrum represents the output of the OSL2B bulb installed in the OSL2 light source and does not account for attenuation within the fiber bundle. The bulb has an integrated hot mirror to block most IR light.

Features

  • High-Output 150 W Bulb with 3200 K Color Temperature
  • DC-Coupled Illuminator for Stable, Consistent Light Output
  • Variable Intensity Control via Front Panel Knob (0% to 100%)
  • Rugged Design with Thermal Safety Cutoff
  • 91 cm (36") Long, Ø6.4 mm (Ø0.25") Core Fiber Bundle Included
  • Internally SM1-Threaded (1.035"-40) Output Port

Thorlabs' OSL2 High-Intensity Fiber Light Source delivers cool-temperature white light for brightfield microscopy, laboratory, and illumination applications. The output illumination intensity is exponentially variable from 0 to 100% using a knob on the front of the unit. The 150 W EKE halogen bulb has a 3200 K color temperature (see the graph to the right) and is user replaceable with optional bulbs sold below. This portable fiber-coupled light source is compatible with 100 to 120 VAC as well as 220 to 240 VAC and includes a location-specific power cord.

Fiber Light Source Tip Mounting
Click to Enlarge

OSL2 Fiber Bundle Tip Post-Mounted Using AD8F Mounting Adapter and LMR1 Fixed Mount

A 91 cm (36") long fiber bundle with a Ø6.4 mm (Ø0.25") effective core is included with the OSL2 light source. To adapt the fiber bundle output to an optomechanical setup, we recommend using our AD8F mounting adapter (see photo to the left), which provides external SM1 (1.035"-40) threading for easy integration with any of our SM1-threaded components. In particular, this adapter can be used to connect the OSL2 to a Cerna® microscope for both epi-illumination and trans-illumination; see the Use with Cerna tab for details.

The fiber illuminator's output port also has internal, 3.5 mm deep SM1 threads. The unit is shipped with a fiber bundle adapter installed in these threads. By removing the fiber bundle mounting adapter from the output port, standard fiber connector adapters (sold below) and other SM1-threaded components can be attached to the light source.

Accessories
We offer collimation and focusing packages for the end of the fiber bundle, single-output fiber bundles, a bifurcated fiber Y-bundle with two goosenecked legs, and a microscope ring illuminator. The single-output fiber bundles are available in two varieties: a metal-jacketed replacement bundle for the included bundle and a gooseneck bundle for increased rigidity and easy manual positioning. Longer length fiber bundles are also available as a custom order by contacting Tech Support.

Four replacement bulbs for use with our high-intensity fiber light sources are available below, along with their emission spectra. The OSL2B and OSL1B bulbs are identical to the bulbs used in the OSL2 and the former OSL1 light sources, respectively, and emit in the visible spectrum. The OSL2B2 bulb also emits in the visible spectrum and provides greater power output at the expense of bulb lifetime. Lastly, the OSL2BIR bulb offers enhanced emission in the near infrared through the use of an aluminum-coated reflector. Further details on compatible bulbs are also provided on the OSL2 Specs tab.

If a higher color temperature is desired, our color-balancing filters can be used to attenuate red light from the OSL2 light source while passing blue light. This results in a beam with a higher color temperature and lower total power.

OSL2 Emission
Click to Enlarge

Click to Download Raw Data
This spectrum represents the output of the OSL2B bulb installed in the OSL2 light source, and does not account for attenuation within the fiber bundle. The bulb has an integrated hot mirror which blocks most IR light.
Distal End of the OSL2 Fiber Bundle
Click to Enlarge

Output End of the Included Fiber Bundle
Item # OSL2a
Light Source Specs
Total Light Output of Bulb 40 000 foot-candles (~430 000 lux) Max
Power at Fiber Tip 1.4 W at Maximum Bulb Intensity
Color Temperature of Included Bulb 3200 K at Maximum Bulb Intensity
Color Rendering Index (CRI) 90%
Intensity Adjustment Range 0 to 100%
Time to Full Brightness 4 s Typical, 7 s Maximum
Output Power Stability ±0.5% over 8 Hours
Lamp Lifetime 1000 to 10 000 Hours to 50% Brightness
Included Bulbb OSL2B (150 W, 3200 K, EKE/10H)
Other Compatible Bulb Typesb OSL2B2 (150 W, 3400 K, EJV)
OSL2BIR (150 W, 3200 K, Enhanced IR, EKE/AL)
OSL1B (150 W, 3250 K, EKE)
Input Voltage 100 - 120 VAC, 50/60 Hz
200 - 240 VAC, 50/60 Hz
Power Consumption 200 W at Maximum Bulb Intensity
Operating Temperaturec -20 to 40 °C
Humidity Range 0 - 80%, Non-Condensing
Weight 2.9 lbs (1.3 kg)
Fiber Bundle Specs
Fiber Bundle Lengthd 91 cm (36")
Fiber Bundle NA 0.57
Fiber Bundle Effective Core Diameter Ø6.4 mm (Ø0.25")
Fiber Bundle Attenuation <0.6 dB/m at 940 nm
Operating Wavelength Range 400 - 1300 nm
Number of Fibers 6718 (Calculated)
Fiber Core Diametere 50 µm
Fiber Cladding Diametere 52.5 µm
Bundle Minimum Bend Radius 100 mm
Operating Temperaturec 0 to 180 °C
  • This table contains the specifications of the OSL2 light source and the included fiber bundle. For the details
    about our line of OSL2 accessories, please see below.
  • These bulbs may be purchased separately below.
  • The combined operating temperature range of the light source and fiber bundle is 0 to 40 °C.
  • Longer length fiber bundles are available as a custom order. Contact Tech Support to order.
  • Dimensions of the individual fibers within the bundle.

Click to Download Raw Data
The typical long-term and short-term output intensity stability of the OSL2 are shown above. The DC-coupled power supply of the OSL2 allows for low noise.

Components for Cerna® Compatibility
Epi-Illumination
WFA2001 Epi-Illuminator Module
AD8F Ø8 mm to SM1 (1.035"-40) Adapter
Trans-Illumination
WFA1000 Trans-Illumination Module or
WFA1100 Dodt Gradient Contrast Module
AD8F Ø8 mm to SM1 Adapter
CP33(/M) SM1-Threaded 30 mm Cage Plate
(Qty. 2)
LA1134 or LA1134-A Ø1" Plano-Convex Lensa
(f = 60.0 mm)
ER3-P4 3" Cage Rods
  • The LA1134 is uncoated, while the LA1134-A features an AR coating with <0.5% average reflectance per surface over the 350 - 700 nm range.

Using the Broadband Halogen Lamp in Cerna® Microscope Systems

The OSL2 high-intensity light source provides effective broad-spectrum illumination for brightfield and reflected light microscopy. It can be used in both epi-illumination and trans-illumination configurations within the Cerna microscopy platform.

Installation on Epi-Illuminator Module

The OSL2 is compatible with a Cerna microscope via the single-cube epi-illuminator module (Item # WFA2001), which contains anti-reflective (AR)-coated optics with <0.5% average reflectance per surface over the 350 - 700 nm wavelength range. The halogen lamp fiber bundle and epi-illuminator module are connected together by an SM1-threaded (1.035"-40) adapter (Item # AD8F). First thread the adapter onto the epi-illuminator module, then secure the fiber bundle with the nylon-tipped setscrews on the adapter [1/16" (1.5 mm) hex]. The epi-illuminator module accepts an uncollimated light source, so no collimation package is necessary.

Click to Enlarge
Thread the AD8F adapter into the WFA2001 epi-illuminator module.
Click to Enlarge
Secure the fiber bundle with setscrews on the AD8F (1/16" [1.5 mm] hex).


Installation on Trans-Illumination Module

Because the WFA1000 and WFA1100 trans-illumination modules need a Ø1" collimated light source secured to a 30 mm cage system to provide even illumination, the emitted beam from the OSL2 must be collimated by a plano-convex lens with a focal length of 60.0 mm. We recommend using either the LA1134 or LA1134-A N-BK7 plano-convex lens. The LA1134 lens is uncoated and will provide relatively even transmission of the entire OSL2 spectrum; the LA1134-A features an AR coating that provides improved transmission in the 350 - 700 nm range but worse transmission above 700 nm. See the Coatings Tutorial for details. A slightly longer focal length lens can be substituted, but will result in dimmer illumination at the sample plane.

To assemble the cage system for the OSL2, first mount the lens onto a SM1 (1.035"-40) threaded 30 mm cage plate (Item # CP33(/M)) using the included retaining rings (Item # SM1RR). The other cage plate secures the Ø8 mm to SM1 adapter (Item # AD8F); utilize an additional retaining ring to set the adapter at a particular position. Attach the cage rods (Item # ER3-P4) to the trans-illumination module by removing the dust cover on the side of the module with a 1.5 mm hex, then locking the cage rods into place using the exposed side-locking 4-40 setscrews (0.05" hex). Once the cage rods are secure, slide the cage plate with the optic onto the rods so that the convex side of the lens faces the trans-illumination module. This is then followed by the cage plate with the AD8F adapter. The cage plates are secured to the cage rods using side-locking 4-40 setscrews. Once the assembly is secure, mount the tip of the fiber bundle onto the end of the collimation package using two 6-32 setscrews [1/16" (1.5 mm) hex]. See the diagram and images below for a visual depiction of this assembly.

Click to Enlarge
Collimating the OSL2
Click to Enlarge
Cage System Components Necessary for Collimation
Click to Enlarge
Secure the cage assembly using the side-locking 4-40 setscrews on the trans-illumination module.

The cage plates should be separated such that the distance between the fiber tip and the plano side of the lens is 2.23" (56.7 mm), the back focal length of the lens. The cage system provides easy adjustment of the distance between the cage plates while maintaining alignment. Please contact Technical Support if you need further assistance with this installation.


Posted Comments:
Tom Baker  (posted 2019-05-15 20:46:42.647)
What is the M60/1 threading compatible with - I can't seem to find any adapters on the adapters page in that size. What filter mounts/sets will work?
llamb  (posted 2019-05-23 04:25:05.0)
Thank you for your feedback. We do not currently have any M60 x 1.0 thread adapters available in our catalog unfortunately. This idea has been noted in our internal product forum for further review.
marcin.bartosik  (posted 2018-08-10 14:21:07.573)
Hello! Please let me know if i could buy the OSL2 without the Fiber Bundle (I would by only an SMA adapter)? Have a nice day, Marcin
YLohia  (posted 2018-08-10 10:08:00.0)
Hello Marcin, thank you for contacting Thorlabs. We can offer this item without the fiber. Quotes for customized items can be requested at techsupport@thorlabs.com.
ms293  (posted 2018-02-15 14:42:58.697)
Hello I want to mount the OSL2YFB into a cage system and was wondering which adapter is used to couple the OSL2YFB to the OSL2? Cheers.
YLohia  (posted 2018-03-31 02:05:51.0)
Hello, thank you for contacting Thorlabs. We currently use a version of the AD8F adapter to mount the OSL2 fiber bundles. You can use this with any internally SM1-threaded optomechanical component, including the CP02 cage plate.
pgutierr  (posted 2015-11-10 17:16:39.737)
Dear ThorLabs, How does the variable intensity control work for the OSL2? By physically blocking the light or dimming the halogen lamp? Best Pablo Gutierrez Electronic Engineering Dpt. European Southern Observatory Karl-Schwarzschild-Str. 2 85748 Garching, Germany
jlow  (posted 2015-11-16 02:07:40.0)
Response from Jeremy at Thorlabs: The variable intensity control works by dimming the halogen lamp.
littlefox121  (posted 2013-08-16 17:38:58.977)
What is the approximate output power if 150W light source is output coupled by fiber bundle?
tcohen  (posted 2013-08-29 16:08:00.0)
Response from Tim at Thorlabs: Although these values can vary, the supplied fiber bundle will be ~500mW. A 7 fiber, 550um core, .22NA would be ~150mW. Single fibers will be less. For example, 1000um, .39NA would be ~80mW.
tcohen  (posted 2012-08-21 13:44:00.0)
Response from Tim at Thorlabs: The output of this source is very high intensity and divergent. If prepared for the losses one will have during coupling, this can be done with aspheric condenser lenses or achromats. A general setup is provided below by Javier. As an alternative, we offer the OSL1-SMA which can directly mate the OSL1 to an SMA 905 connectorized fiber bundle. I will contact you directly to go over these options with you.
czl0579  (posted 2012-08-20 12:52:57.0)
Do you have some suggestions that how to couple this light source into a multimode fiber (M14L02)? We lost the original fiber bundle and now use a light guide instead. Also, do you have some suggestions to couple the source to it? Thanks.
anqi.zhang  (posted 2012-08-17 10:00:00.0)
Any suggestion regarding how to couple this light source into a 50 micron core fiber?
tcohen  (posted 2012-04-16 10:39:00.0)
Response from Tim at Thorlabs: Thank you for your feedback! We are constantly looking for ways to improve our products and I will discuss your suggestion with our production team.
user  (posted 2012-04-12 15:47:27.0)
would be cool if there was an inexpensive way to control this remotely. Only other option I can find is your $2k high power source.
lmorgus  (posted 2011-03-31 14:41:00.0)
Response from Laurie at Thorlabs to the anonymous poster: Thank you for taking the time to let us know that one of our links is broken. We will fixed it right away and apologize for the inconvenience.
user  (posted 2011-03-31 13:58:58.0)
Catalog page PDF download link for the OSL1 is broken
Thorlabs  (posted 2010-11-08 17:48:28.0)
Response from Javier at Thorlabs to last poster: we are currently gathering this information for you. Please contact us at techsupport@thorlabs.com so that we can can keep you updated on this request.
user  (posted 2010-11-08 12:29:06.0)
Is it possible to label the spectral density of the plot on the overview tab with units of uW/nm, as is done for the HPLS-30-04?
Thorlabs  (posted 2010-09-10 15:45:00.0)
Response from Javier at Thorlabs to yuj210: I will contact you shortly.
yuj210  (posted 2010-09-09 13:53:14.0)
Dear Javier, would you reply my following inquiries ASAP? I sent mails, left voice message also. Thanks.
Thorlabs  (posted 2010-09-08 19:10:19.0)
Response from Javier at Thorlabs to yuj210: Regarding the OSL1, the output from the fiber is very divergent (NA in the range of 0.5-0.6), so it is very difficult to achieve a well collimated output. In order to collect the output from the fiber tip, I would recommend using one of our aspheric condenser lenses. A good candidate is the ACL5040: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=3835 This lens has a diameter of 50 mm, a focal length of 40 mm, and a numerical aperture of 0.55. This lens can be mounted onto the LMR2 mount: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1433&pn=LMR2 Now, in order to focus the output from the OSL1 into multimode fiber, you will most likely need to reduce the size of the beam. A 20X beam expander used as a reducer may be suitable: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1580 I will contact you directly to discuss the details of your application, including the fiber specifications.
yuj210  (posted 2010-09-08 00:56:30.0)
Im planning an experiment using this OSL1. Let me ask something. If I dont care money much, what would be the best choice to get collimated beam with OSL1. Im thinking of chromatic lens, AC127-019-A-ML . I need your comment and recommend also. Thanks.
Thorlabs  (posted 2010-08-06 11:45:02.0)
Response from Javier at Thorlabs to last poster: Thank you for your feedback. We have added the light output spec in lux.
user  (posted 2010-08-06 11:11:35.0)
Who uses "foot candles" these days, try to make to the modern world
Adam  (posted 2010-05-12 16:10:04.0)
A response from Adam at Thorlabs to dellapir: We took one from stock and measured the power. The minimum power is 50mW and the maximum power is 1.8W. The change in the power is exponetial as you rotate the potentiometer.
dellapir  (posted 2010-05-12 12:46:23.0)
Mr./Mrs: We´ve bought your OSL1-EC lamp with optical fiber. As you know it is possible to change the intensity of the lamp, and this is the information that we need. Can you tell us what the minimum and maximum intensity emitted by the lamp? The change , which is possible using the potentiometer marked on the lamp, is a linear or exponential? Thank you!!! Best regards. Monica Della Pirriera MNT group Univeridad Poltecnica de Cataluña
apalmentieri  (posted 2009-12-18 11:37:15.0)
A response from Adam at Thorlabs: I would like to discuss this further with you. I will send you an email to try and find out the exact parameters that you are looking for.
juanpamunoz  (posted 2009-12-18 09:23:20.0)
Hi, i´m using your lamp in the "Opto Electronic Lab of UNIVERSIDAD DE CONCEPCION, CHILE", and i would like to know more specifications about the "High-Intensity Fiber Light Source OSL1-EC", like SNR coefficient and another kind of parameters. Thus, i could add more accuracy to my thesis measurements. Thanks a lot. Juan Pablo Muñoz Carmona. Thesis Student. Civil Engineering Electronics. Universidad de Concepción.
jens  (posted 2009-06-09 08:12:28.0)
A reply from Jens at Thorlabs: coupling of this 150W light source into a single mode fiber is virtually impossible. We might be able to offer a different solution if we get additional information regarding your setup. I will contact you directly for that.
user  (posted 2009-06-09 04:21:03.0)
what adapter do i use to couple the SMF(core 9um)?
jens  (posted 2009-05-18 17:45:55.0)
An answer from Jens at Thorlabs: the output power at 1100nm is virtually zero. We probably can offer a custom solution where we would replace the light bulb inside the unit. We will contact you with a quotation directly. As for the collimation you could try using a pinhole but if you need better collimation since you may want to guide the light over a longer distance a plano-concave singlet lens such as our BK7 lens LA1540 can be used. The lens will need to be place 15mm in front of the output. The output fiber bundle can be hold in place using our AD12F adapter. Using that adapter the fiber end can be mounted in a cage system using cage plate CP02. We will contact you directly as soon as possible.
nutik  (posted 2009-05-18 16:55:54.0)
Do you have any accessories for this light source to have a parallel output beam or a focused beam? What is the intensity of the output light at 1100nm?
Tyler  (posted 2008-08-14 10:54:17.0)
A response from Tyler at Thorlabs to sai: The blackbody radiation equation shown on the specs tab is really only intended to give the user of an OSL1 an idea of the spectral distribution of the light emitted from the halogen lamp. In reality, the lamp is not a perfect blackbody source and certainly the glass bulb and MM fiber bundle will have some absorption profile that will modify the emitted intensity versus wavelength even further from an ideal blackbody source.
sai  (posted 2008-08-04 11:03:38.0)
I have a question regarding the formula you have used to calculate the intensity in the "specs" tab. Will this give me power density (Watts per cubic meter)? If yes, can you please tell me how to find the intensity in terms of Power/ Surface area (Watts per sq meter)? Thanks!
Tyler  (posted 2008-08-01 13:58:59.0)
A response from Tyler at Thorlabs to smitachat2001: Thank you for your interest in the OSL1. There is no specific reason why the OSL1 halogen lamp cannot be left on continuously. The housing will get quite warm over time but if the unit is in a room temperature environment and the airflow to the cooling fan is not blocked the lamp will function properly. The one drawback to using the lamp continuously is that the hotter the lamp is the shorter its lifetime so for continuous use it might be wise to improve the cooling of the lamp.
smitachat2001  (posted 2008-07-30 21:20:50.0)
It is certainly usefull product but it looks as if they are not meant to be used for 24 hours, which makes them restricted for many lab purposes.
Tyler  (posted 2008-06-26 16:29:35.0)
A response from Tyler at Thorlabs to leosis: I have added a plot of the theoretical emission intensity as a function of wavelength to the "Specs" tab. The light will appear white, but as you can see from the plot, the emission intensity will peak near 910 nm when the unit is at maximum power.
leosis  (posted 2008-06-23 07:20:25.0)
i want to know the operating wavelengt of this product. please, reply to me about this information.
Tyler  (posted 2008-06-05 12:16:30.0)
A response from Tyler at Thorlabs: The divergence angle of the fiber bundle is not a controlled specification and as a result cannot be guaranteed. However, I tested a OSL1 and measured a divergence angle of 33 degrees (This was determined by measuring the spot diameter at several distances from the fiber bundle tip and fitting the data to a straight line. The inverse tangent of the slope of the fit line was 33 degrees.)
user  (posted 2008-06-05 10:13:02.0)
Whats the divergence angle of the fiber bundle at the output tip?

Below is a selection guide for all of our white-light, broadband light sources (or lamps). In addition to these sources, Thorlabs also offers unmounted white-light LEDs, white-light mounted LEDs, white-light fiber-coupled LEDs, and high-powered, white-light Solis™ LEDs.

Broadband Light Source Selection Guide
Item # (Click to
Enlarge;
Not to Scale)
Emitter Type Wavelength
Range
(Click for Plot)
Output Coupling Output Power Bulb
Electrical
Power
Color
Temperature
Bulb
Lifetime
Replacement
Bulb
SLS204 Deuterium 200 - 700 nm Free Space or
Fiber Coupled (SMA)
2 mWa
0.1 mWb
(Typ.)
30 W N/A 2000 hc SLS254B
SLS205 Xenon Arc 240 - 1200 nm Free Space or
Fiber Coupled (SMA)
290 mWa
5.5 mWd
(Typ.)
75 W 5800 Ka
5400 Kd
2000 hc SLS255B
SLS401 Xenon Arc 240 - 2400 nm Free Spacee >1.3 Wa 150 W 5800 K 2000 hc SLS401B
SLS402 Mercury-Xenon Arc 240 - 2400 nm Free Spacee >1.3 Wa 150 W 6000 K 2000 hc SLS402B
SLS201L(/M) Quartz
Tungsten-Halogen
360 - 2600 nm Free Spacee or
Fiber Coupled (SMA)
500 mWa
10 mWf
9 W 2796 K 10 000 h SLS251
SLS301 360 - 3800 nm Free Spacee >1.6 Wa 150 W 3400 K 1000 hg SLS301B
OSL2 Typical
Spectrum
Fiber Bundle 1.4 Wh 150 W 3200 K 1000 to
10 000 hc
OSL2B,
OSL2B2,
or OSL2BIR
QTH10(/M) 400 - 2200 nm Free Space 50 mW (Typ.) 10 W 2800 Ki (Typ.) 2000 h QTH10B
SLS202L(/M) Tungsten 450 nm - 5.5 µm Free Spacee or
Fiber Coupled (SMA)
400 mWa
2 mWj
7.2 W 1900 K 10 000 h SLS252
SLS203L(/M) Silicon Carbide Globar 500 nm - 9 µm Free Space >1.5 Wa 24 W 1500 K 10 000 h SLS253
SLS303 Silicon Nitride Globar 550 nm - 15 µm Free Space 4.5 Wa 70 W 1200 K 5000 hg SLS303B
  • Free-space optical power measured without adapters at the beginning of bulb lifetime.
  • Measured with Thorlabs' M114L01 solarization-resistant patch cable at beginning of bulb lifetime.
  • Operation time before the maximum optical output power of the bulb reaches 50% of its original output.
  • Measured with Thorlabs' M111L01 solarization-resistant patch cable at beginning of bulb lifetime.
  • Adapters are available separately to couple the free-space output into liquid light guides (LLGs).
  • Fiber-coupled optical power, measured with included M28L01 fiber patch cable at beginning of bulb lifetime.
  • Operation time before the controller cannot stabilize the output power of the bulb.
  • Power at Fiber Tip at Maximum Bulb Intensity
  • Color temperature will vary from unit to unit.
  • Measured with Thorlabs' MZ41L1 ZrF4 mid-IR patch cable at the beginning of bulb lifetime.

Fiber Light Source

  • 150 W, 3200 K Halogen Bulb
  • Continuously Variable Output Power via Front Panel Knob
  • SM1-Threaded Output Port with 91 cm (36") Long Fiber Bundle

Thorlabs' OSL2 High-Intensity Fiber Light Source is designed for illumination of brightfield microscopy setups and general-purpose laboratory use. A removable, 91 cm (36") long, Ø6.4 mm (Ø0.25") effective core fiber bundle is included. Replacement bundles are available below. Additionally, the light source has an internally SM1-threaded (1.035"-40) output port for custom integration into optomechanical setups.

This light source has a built-in protection mechanism to prevent the unit from overheating and to turn off the lamp when the access door is opened. The LED indicator on the front panel is green during normal operation. If the unit overheats or if the access door is opened, power to the lamp is cut off and the LED turns red.

The OSL2 has a built-in universal power supply and includes a location-specific detachable power cord. Additional user-replaceable light bulbs can be purchased below. To order the OSL2 without the included fiber bundle, or for general custom order inquiries, please contact Tech Support.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OSL2 Support Documentation
OSL2High-Intensity Fiber-Coupled Illuminator with 91 cm (36") Long Fiber Bundle
$990.14
Today

Fiber Bundles for the OSL2 Fiber Light Source

OSL2 Single-Output Bundle
Click to Enlarge

OSL2FB Bundle Laying Flat
on the Table
OSL2 Single-Output Bundle
Click to Enlarge

OSL2RFB Gooseneck Bundle Angled Upward
OSL2 Gooseneck Y-Bundle
Click to Enlarge

OSL2YFB Gooseneck
Y-Bundle Provides Two Independently Positionable Beams
  • Replacement Fiber Bundles for OSL2 Light Source
  • Gooseneck Bundles Provide Added Rigidity for Easy Manual Positioning
  • Y-Bundle Provides Two Independently Positionable Beams
  • Also Compatible with the Former OSL1 Light Source

Thorlabs offers fiber bundles designed to be used with the OSL2 Fiber Light Source sold above. These cables have fiber tips with Ø7.9 mm (Ø0.31") outer dimensions, enabling them to be used in place of the fiber bundle included with the OSL2.

Single-Output Fiber Bundle
The OSL2FB Single-Output Fiber Bundle has a flexible stainless-steel housing and is a direct replacement for the bundle included with the OSL2 Light Source.

Gooseneck Single-Output Fiber Bundle
The OSL2RFB Gooseneck Single-Output Fiber Bundle has the same fiber configuration as the bundle included with the OSL2, but has a gooseneck jacket for stability and easy manual positioning. The gooseneck jacket allows the bundle to maintain its position once it has been set.

Gooseneck Y-Bundle
The OSL2YFB Gooseneck Y-Bundle (Bifurcated) Cable splits the output of the fiber light source into two independently positionable beams, allowing larger work areas to be illuminated. Unlike the fiber bundle included with the OSL2, each leg of this bifurcated cable has a gooseneck jacket for easy manual positioning.

Item #OSL2FBOSL2RFBOSL2YFB
Description Single-Output Bundle Gooseneck
Single-Output Bundle
Gooseneck Y-Bundle
Fiber Bundle Length 91 cm (36") 91 cm (36") 51.69 cm (20.35")
Bundle Effective Core Diameterb 6.4 mm (0.25") 6.4 mm (0.25") 4.52 mm (0.18")
Operating Wavelength Range 400 - 1300 nm
Numerical Aperture (NA) 0.57
Number of Fibers (Input) 6718 (Calculated)
Fiber Core Diametera 50 µm
Fiber Cladding Diametera 52.5 µm
Fiber Material Silica
Fiber Strength >150 kg/mm2
Attenuation (at 940 nm) <0.6 dB/m
Minimum Bend Radius 100 mm 100 mm 150 mm
Operating Temperature 0 to 180 °C 0 to 135 °C 0 to 135 °C
  • Dimensions of the individual fibers within the bundle.
  • Effective core diameter at the output of the fiber bundle.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OSL2FB Support Documentation
OSL2FBCustomer Inspired! Single-Output Bundle for OSL2 Fiber Light Source, 91 cm (36")
$122.28
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OSL2RFB Support Documentation
OSL2RFBCustomer Inspired! Gooseneck Single-Output Bundle for OSL2 Fiber Light Source, 91 cm (36")
$143.92
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OSL2YFB Support Documentation
OSL2YFBGooseneck Y-Bundle for OSL2 Fiber Light Source, 51.69 cm (20.35") Legs
$165.56
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Microscope Ring Illuminator for the OSL2 Fiber Light Source

FRI61F50 Mounted to a Microscope
Click to Enlarge
FRI61F50 Mounted on a Zoom Microscope
  • Large Optimal Working Distance Range: 50 - 140 mm
  • Provides a Bright, Uniform, 360° Shadow-Free Illumination Area
  • Provides Lighting Along the Microscope's Optical Axis

Thorlabs’ FRI61F50 Fiber Ring Illuminator has a 915 mm (36.02") long fiber bundle that couples light from our OSL2 Fiber Light Source into a Ø55 mm ring illuminator composed of five concentric fiber rings. The illuminator easily mounts onto most standard upright microscopes, such as the one shown to the right, using three thumbscrews, each of which is nylon tipped to produce adequate holding friction while preventing scratching or marring of the microscope. The fiber ring slips around any objective housing with a diameter between 52 - 60 mm.

The 5 fiber rings in our fiber ring illuminator create overlapping beams incident upon the sample plane, which ensures a shadowless sample field. Additionally, the overlapping of these beams allows illuminators to provide a relatively long working distance (WD). This ring illuminator provides lighting very nearly aligned to the optical axis of the microscope that is uniform across the sample plane through the entire WD range. The use of 5 fiber rings increases light intensity and WD compared to a single fiber ring. 

An adapter is included to attach the fiber ring illuminator to the OSL2. Alternatively, the AD16F adapter may be used. The adapter secures the fiber ring illuminator using two nylon-tipped setscrews, which can be tightened using the included 1/16" hex key.

The FRI61F50 has a WD of 50 - 170 mm with an optimal WD range (shadow-free illumination) of 50 – 140 mm. The diameter of the illuminated circle scales with the WD, starting at ~Ø1.3 mm at a WD of 70 mm and reaching ~Ø6.1 mm at a WD of 140 mm. An external M60 × 1 thread on the head of the illuminator gives the option of attaching various elements such as custom filters or diffusers.

Clicking the info icon icon below will open a window that contains additional specifications, performance data, and drawings.

Item # Info Operating
Wavelength Range
Transmission Working Distance (WD) Compatible Objective Housing Diameter
FRI61F50 info 365 - 900 nm 46% 50 - 170 mm
50 - 140 mm (Optimal)a
52 - 60 mm
  • Defined as Projecting Greater Than or Equal to 50% of the Maximum Output Power onto the Sample Field
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FRI61F50 Support Documentation
FRI61F50Fiber Ring Illuminator for OSL2 Fiber Light Source, WD = 50 - 170 mm
$430.68
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Collimation and Focusing Packages for Fiber Bundles

Item #OSL2COLOSL2FOC
Description Collimation Package Focusing Package
Working Distance (WD) N/A 20 mm
Outer Dimensions Ø17.8 mm x 47.3 mm Ø17.8 mm x 56.0 mm
Threads on Output Port Internal SM05 (0.535"-40) Threads
Installed Lenses LA1289 (1 Place) LA1289 (2 Places)
Spot Size at 20 mm
Working Distance
Ø14.5 mm Ø5.5 mm
Collimation Package with Filter
Click for Details

OSL2COL Collimation Package with Mounted Ø25.0 mm Filter
  • Packages to Collimate or Focus Light
  • Designed for Use with the OSL2 and Former OSL1 Light Sources
  • Internal SM05 (0.535"-40) Threads at Output End for Thorlabs' Ø1/2" Lens Tubes
  • Same Ø0.70" (Ø17.8 mm) Outer Diameter as Our Ø1/2" Lens Tubes
Fiber Bundle Beam
Click for Details

Fiber Bundle Without Optics
Fiber Bundle Collimation Package
Click for Details

OSL2COL Collimating Package
Fiber Bundle Focusing Package
Click for Details

OSL2FOC Focusing Package

These collimation and focusing packages are designed for use with the fiber bundle included with the OSL2 and the fiber bundle included with the former OSL1, as well as all of the replacement fiber bundles sold above. Two 6-32 setscrews that accept a 1/16" hex key secure the tip of the fiber bundle into the back of the collimation or focusing package. Internal SM05 (0.535"-40) threads on the front of each package and a 0.70" (17.8 mm) outer diameter make these directly compatible with our family of Ø1/2" lens tubes and components.

The photos to the left show the light output from the fiber bundle included with the OSL2. The photo to the far left shows the highly divergent beam emitted from the fiber bundle when it does not have a lens assembly attached. The other two photos show the beam when the collimation and focusing packages are attached.

The photo to the right illustrates one way to filter the output light from the OSL2 using a mounted Ø25.0 mm filter. For details on alternate configurations using unmounted Ø12.5 mm or Ø25.0 mm filters, please click the photo.

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OSL2COL Support Documentation
OSL2COLCollimation Package for OSL2-Compatible Fiber Bundles
$98.47
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OSL2FOC Support Documentation
OSL2FOCFocusing Package for OSL2-Compatible Fiber Bundles, WD = 20 mm
$133.10
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Replacement Light Bulbs


Click to Enlarge

OSL2 Light Bulb Replacement
Access Door
  • OSL2B: Replacement 3200 K Bulb for the Original Light Bulb Included with the OSL2 Light Source
  • OSL2B2: 3400 K Bulb with Higher Output Power than OSL2B (See Graph Below)
  • OSL2BIR: 3200 K Bulb with Enhanced Illumination in the Near Infrared
  • Replacement Bulb for the Former OSL1 Light Source Sold Below

Thorlabs offers three different replacement bulbs for the OSL2 High-Intensity Fiber Light Source. The OSL2B is identical to the original bulb that comes with the OSL2, and the OSL2B2 is a high-power variant of the OSL2B. The OSL2B and OSL2B2 bulbs each have an integrated hot mirror that blocks most of the IR light. In contrast, the OSL2BIR provides enhanced output in the near-IR due to the aluminum-coated reflector and lack of integrated hot mirror. The graph below compares the spectra and relative power of these bulbs. To view a spectrum and raw data for each individual bulb, click on the graph icons in the table below.

To install the replacement bulb in the OSL2 source, open the door on the top of the unit, as shown in the photo to the right, and remove the old bulb. Details are available in Chapter 5 of the OSL2 manual, available as a PDF here.

Item # OSL2B OSL2B2 OSL2BIRa
Spectrumb
(Click for Details)
OSL2B Spectrum OSL2B2 Spectrum OSL2BIR Spectrum
Bulb Type 150 W, 3200 K, EKE/10H 150 W, 3400 K, EJV 150 W, 3200 K, EKE/AL,
Al-Coated Reflector
Lifetime 1000 Hours 40 Hours 200 Hours
  • The OSL2BIR emits strong infrared light. Thorlabs' fiber bundles designed for the OSL2 light source are compatible with this source, but we recommend verifying that any other fiber bundle used with this source can sustain the heat from the bulb. The OSL2BIR is not compatible with the former OSL1 light source.
  • Each spectrum represents the output of the bulb installed in the OSL2 light source, and does not account for attenuation within the fiber bundle.

Click to Enlarge

OSL2 Replacement Light Bulb Comparison
*OSL2B is Included with OSL2 Light Source
Click for Raw Data
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OSL2B Support Documentation
OSL2B3200 K Replacement Bulb for OSL2, 1000 Hour Lifetime
$51.94
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OSL2B2 Support Documentation
OSL2B2Customer Inspired! 3400 K Replacement Bulb for OSL2, 40 Hour Lifetime
$39.77
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OSL2BIR Support Documentation
OSL2BIRCustomer Inspired! 3200 K Enhanced IR Replacement Bulb for OSL2, 200 Hour Lifetime
$66.28
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Fiber Connector Adapters

Collimation and Focusing Packages
Click for Details

OSL2 with an SM1SMA Adapter and Multimode Fiber Bundle

Thorlabs' Fiber Connector Adapters allow fiber patch cables and bundles with standard connectors to be used with the OSL2 light source (see photo to the right). Please note that the light output from fiber patch cables or bundles will be lower than that of the fiber bundle included with the OSL2, due to the smaller core or effective core diameter and lower NA. We recommend verifying that any other fiber bundle used with the OSL2 light source can sustain the heat from the bulb; please contact Tech Support with inquires.

To connect a patch cable, the fiber bundle adapter that comes preinstalled on the OSL2 must first be removed by unscrewing it from the output port. Next, thread the fiber connector adapter into the output port. Each disk has four dimples, two in the front surface and two in the back surface, that allow it to be tightened from either side using either the SPW909 or SPW801 spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications. For Thorlabs' full line of SM1-threaded adapters, see Terminated Fiber Adapters.

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SM1FC Support Documentation
SM1FCFC/PC Fiber Adapter Plate with External SM1 (1.035"-40) Threads
$31.38
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SM1SMA Support Documentation
SM1SMASMA Fiber Adapter Plate with External SM1 (1.035"-40) Threads
$31.38
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Replacement Bulb for the Former OSL1 Fiber Light Source

Item # OSL1B
Spectruma
(Click for Details)
OSL1B Spectrum
Bulb Type 150 W, 3250 K, EKE
Lifetime 200 Hours
  • This spectrum represents the output of the bulb and does not account for attenuation within the fiber bundle.

The OSL1B replacement light bulb is identical to that included with our former OSL1 light source. The bulb has an integrated hot mirror that blocks most of the IR light. Click on the graph icon in the table to the right to view the bulb's emission spectrum.

To install the replacement bulb in the former OSL1 source, simply loosen the two fasteners on the front panel of the unit, slide out the bulb assembly, and remove the old bulb. Details are available in Chapter 4 of the OSL1 manual, available as a PDF here. The OSL1B bulb can also be installed in our OSL2 light source by following the installation instructions in Chapter 5 of the OSL2 manual.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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OSL1B Support Documentation
OSL1B3250 K Replacement Light Bulb for OSL1 and OSL2 Fiber Light Sources
$39.77
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SMA Fiber Bundle Adapter for the Former OSL1 Fiber Light Source

OSL1-SMA Adapter
Click to Enlarge
SMA Fiber Bundle Attached to OSL1-SMA Adapter

The OSL1-SMA fiber bundle adapter allows multimode fiber bundles with SMA connectors to be used as the output of our former OSL1 fiber light source. Our fiber bundles with SMA connectors offer broader operating wavelength ranges than the fiber bundle included with the former OSL1 and the OSL2YFB bifurcated fiber bundle (sold above), and they are available in longer lengths.

The OSL1-SMA adapter inserts into the front panel of the former OSL1 unit and is secured by a thumbscrew. It is compatible with SMA905- and SMA906-style connectors.

Note: The OSL1-SMA is not compatible with our current OSL2 light source.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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OSL1-SMA Support Documentation
OSL1-SMASMA Fiber Bundle Adapter for OSL1 Fiber Light Source
$33.28
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Last Edited: Mar 13, 2014 Author: Dave Gardner