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Liquid Light Guides


  • Outstanding White Light Transmission
  • Ø3 and Ø5 mm Core Sizes Available from Stock
  • Operating Temperature Range: -5 to 35 °C

AD3LLG

Ø3 mm Liquid Light Guide
to SM1 Adapter

LLG3A1-A

Collimating Adapter

LLG0338-8

Liquid Light Guide

Application Idea

Liquid Light Guide Mounted to SLS402 Broadband Source Using SLSLLG-2 Adapter w/ Shutter

SLSLLG3

Liquid Light Guide Adapter for Broadband Light Sources

Related Items


Please Wait
Ends of Standard and Yellow-Banded LLGs
Click to Enlarge

Aside from the yellow band, the LLG0338-4 (top) and LLG03-4H (bottom) liquid light guides are identical. The yellow band on the latter serves as a visual indicator when the LLG is used with the HPLS300 series light sources.

Features

  • Excellent Transmission from 340 to 800 nm
  • Numerical Aperture of 0.59
  • Half Angle of 36°
  • Suitable for Rugged Environments
  • Adapters Designed to Mate Ø3 mm or Ø5 mm Liquid Light Guides to SM1 or SM2 Thread Standard Available Below
  • Microscope Collimation Adapters Available Below

Thorlabs' Liquid Light Guides (LLGs) offer outstanding transmission from 340 - 800 nm for white light illumination applications, and can be used with our stabilized broadband sources, free-space broadband sources, or plasma light sources. For large core diameters, liquid light guides are a more efficient transmission solution than fiber bundles as they eliminate the packing fraction loss (dead space) that fiber bundles have. These light guides can be mounted to an optical breadboard by using one of our VH1(/M) V-Mounts, a Ø1/2" (12.7 mm) post, and post holder. The Ø3 mm and Ø5 mm light guides can also be mounted to SM1-threaded (1.035"-40) components using the adapters sold below.

These liquid light guides are offered from stock with a core diameter of either 3 or 5 mm, and their long-term temperature range is -5 to 35 °C. The LLG03-4H and LLG05-4H versions are stocked in 4' lengths, and the others are offered in lengths of 4', 6', and 8'. The only LLGs to feature a yellow band, shown in the image at the right, are the LLG03-4H and LLG05-4H, which are intended to be used with the HPLS343 and HPLS345 high-power plasma light sources, respectively. The yellow band acts as a visual indicator; the liquid light guide is correctly installed in the light source when the edge of the band is flush with the front panel of the instrument. The yellow band is a cosmetic feature. Thus, aside from the yellow band, the LLG03-4H and LLG0338-4 are identical. Similarly, the LLG05-4H and LLG0538-4 are also identical.

All of our LLGs are available with custom lengths as made-to-order items by contacting Tech Support.

Thorlabs also offers collimating and coupling adapters for the Ø3 mm and Ø5 mm liquid light guides, which are sold separately below. The SLSLLGx coupling adapters are directly compatible with our Broadband Light Sources. Additionally, we offer a variety of collimating adapters that allow the LLGs to be coupled to the illumination ports used by various microscope manufacturers.

All transmission data presented here is typical. The maximum variation from lot to lot is ±5%. As a function of length, only minimal variations (<5%) are expected between our 4' (1.2 m), 6' (1.8 m), and 8' (2.4 m) long liquid light guides.

The shaded regions in the graphs below denote the spectral range over which we recommend using these liquid light guides.

Liquid Light Guide Dimensions

Active Core Diameter Standard End Fittings Protective Sleeve Min. Bending Radius
d0 d1 l1 d2 l2 d3  
3 mm 5 +0/-0.1 mm 20 ± 0.1 mm 9 ± 0.1 mm 24 ± 0.1 mm 7 ± 0.1 mm 40 mm
5 mm 7 +0/-0.1 mm 20 ± 0.1 mm 10 ± 0.1 mm 24 ± 0.1 mm 9.5 ± 0.1 mm 60 mm

The drawing and photograph below illustrate the dimensions given in the table above. 180 ± 0° indicates the flatness tolerence between the metal and black material in the segment labled l2.

LLG Photo Schematic
LLG Drawing
Closeup of LLG Endface

Cleaning the Optical End Faces of Liquid Light Guides

The optical end faces of these liquid light guides are made of fused silica, Teflon and either aluminum, chrome plated brass, or stainless steel. All of these materials are very resistant to all common cleaning solvents, making them easy to clean. Please note that when using solvents to clean the end faces, you cannot submerge the tip of the light guide in the solvent, or use a heavily soaked cleaning pad, as the solvent may get into the light guide, causing damage. If you find that debris from the light guide end cannot be removed by using a solvent, you can gently use a razor blade to clean the tip, making sure that you do not chip the edge of the fused silica glass window.


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Posted Comments:
Poster:maelle.ogier
Posted Date:2017-10-13 17:08:15.837
Hello, we are looking for an adapter to make a coupling between an Intensilight Nikon source, which outputs through their 3mm core light guide and a fiber with SMA905 connector. Is there a simple way to do this ? We are wondering if we need to invest in micropositioning alignment ? and beam focusing ? What are the different options ? (given that the source probably delivers much more power than needed now). Thanks in advance. Maelle
Poster:harris.morrison
Posted Date:2017-08-09 13:13:21.947
Hi, Am about to dispose of a light guide and was wondering if there were any hazards associated with the light guide? Science being what it is now, they like to make sure we use the correct dumping procedure. Many thanks, Harris
Poster:tfrisch
Posted Date:2017-09-06 12:01:28.0
Hello Harris, thank you for contacting Thorlabs. I will reach out to you directly about returning that LLG to us for disposal.
Poster:carlos.macias
Posted Date:2017-06-28 17:54:23.457
Hello. Is it possible to couple the light from MNWHL4 into one of your light guides?
Poster:tfrisch
Posted Date:2017-07-11 10:22:39.0
Hello, it looks like you have already been in contact with our Tech Support team, but yes, AD3LLG and AD5LLG would be useful in adapting the LLG to a lens tube system which may contain optics to collect the light, or may just hold the LLG near the emitting LED.
Poster:jjgarcia
Posted Date:2017-01-31 04:23:40.78
Would you have a liquid light guide (LLG) like the one with the reference number: LLG0338-4, but for VIS-NIR wavelength range (say with transmission around 80% up to 1000nm or 1500nm) Thanks!
Poster:tfrisch
Posted Date:2017-02-16 02:26:16.0
Hello, thank you for contacting Thorlabs. Unfortunately, we cannot offer a custom version of the liquid light guide optimized for NIR at this time. I will reach out to you directly.
Poster:bobkov
Posted Date:2014-09-17 15:21:35.837
Could you please provide me with the transmission spectrum of LS liquid light guide (within range 200-1000nm)? I would love to have it in some sort of ASCII data or other data formats rather than a graphic material. Many thanks in advance.
Poster:jlow
Posted Date:2014-09-19 01:04:32.0
Response from Jeremy at Thorlabs: We can provide the raw data for the graphs online. I will contact you directly about this and we will look into having that available to download from the website as well.
Poster:jcarreras77
Posted Date:2014-05-29 10:34:23.263
Hi there. We are fabricating a prototype for a commercial product and we would like to couple the light output of an LED spotlight into a LLG (visible range, total optical power of 7W). The spotlight is made of a 40 LED PCB of 4x4cm with a conic reflector that makes a 25º aperture beam with a 7.5 diameter glass at the end of the system. Can you please tell me what kind of aspherical lenses and coupling systems from Thorlabs should we use? Thank you!
Poster:besembeson
Posted Date:2014-05-29 04:31:33.0
A response from Bweh E at Thorlabs Newton-USA: Thanks for contacting Thorlabs. I will followup with you by email to clarify your source characteristics so that we can determine best optical components for coupling to the LLG.
Poster:bdada
Posted Date:2012-03-15 13:00:00.0
Response from Buki at Thorlabs: We would not recommend a laser source for use with the Liquid Light Guides. The only light sources for the LLG that we have tested are our HPLS243 and HPLS245 plasma light sources. In addition to our light sources, we also recommend tungsten halogen, xenon or metal halide light sources. Please contact TechSupport@thorlabs.com to discuss your application further so we can suggest alternative solutions.
Poster:
Posted Date:2012-03-07 11:59:32.0
Are LLGs suitable for delivery of 532nm pulsed laser sources? Jon
Poster:bdada
Posted Date:2012-01-25 16:42:00.0
Response from Buki at Thorlabs: Thank you for using our feedback forum. The only light sources for the LLG that we have tested are our HPLS243 and HPLS245 plasma light sources. In addition to our light sources, we also recommend tungsten halogen, xenon or metal halide light sources. For any light source, the main factors to consider are the wavelength range and possible overheating. Light below 400nm and above 750 - 800nm could damage the LLG and should be filtered out. If the temperature of the LLG stays above 35 degrees Celcius for a prolonged period, it could affect the transmisison properties. We have contacted you to provide additional information.
Poster:iftachn
Posted Date:2012-01-18 09:45:26.0
Would this light guide work well for a mercury lamp illuminator such as the Nikon Intensilight ?
Poster:bdada
Posted Date:2012-01-12 20:02:00.0
Response from Buki at Thorlabs: The liquid light guide is recommeded for use with tungsten halogen, xenon or metal halide light sources. If you are looking for a fiber coupled LED (MCWHL2), please consider MCWHF1 - Cold White (5600K) Fiber-Coupled High-Power LED, SMA, 1000 mA. The product link is below. You would need to purchase the fiber cable separately. Please contact TechSupport@thorlabs.com if you have any questions. http://thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=5206
Poster:
Posted Date:2012-01-12 14:21:25.0
Is it possible to use the liguid light guide with an LED (part # MCWHL2)? Tefo
Poster:jjurado
Posted Date:2011-07-25 10:02:00.0
Response from Javier at Thorlabs to ckonek: Thank you very much for contacting us. We currently do not sell collimators specifically designed for liquid light guides. However, we do offer a few components that you can use to put together your own collimation insert. For example, if you are interested in the 5 mm core diameter liquid light guides, you can use an AD8F adapter to mount the LLG into an SM1 lens tube like the SM1M20. In order to collect the output from the LLG, you can use a condenser lens like ACL2520. Keep in mind that the output from the lens will still be divergent, due to the large core size of the LLG. AD8F: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1746 SM1M20: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=3307&pn=SM1M20#3387 ACL2520: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=3835
Poster:ckonek
Posted Date:2011-07-20 10:33:59.0
Im wondering if you sell collimators for your liquid light guide products. Chris
Poster:Thorlabs
Posted Date:2010-09-22 11:45:51.0
Response from Javier at Thorlabs to walter.clark: the main advantage of liquid light guides over fiber bundles is their large numerical aperture. Our liquid light guides have a numerical aperture of 72°, whereas most common fiber bundles have an NA around half of this value. Another advantage is that liquid light guides eliminate the packing fraction loss (dead space) that fiber bundles have.
Poster:walter.clark
Posted Date:2010-09-20 17:42:50.0
I dont understand why liquid is better than solid. Is it because it is more flexible? Then why not bundle more fibers? Walt

Ø3 mm Core Liquid Light Guides

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LLG0338-4 Support Documentation
LLG0338-4Liquid Light Guide Ø3 mm Core, 4' (1.2 m) Length
$352.00
Today
LLG03-4H Support Documentation
LLG03-4HLiquid Light Guide Ø3 mm Core, 4' (1.2 m) Length, Yellow Banded End for HPLS343
$352.00
Today
LLG0338-6 Support Documentation
LLG0338-6Liquid Light Guide Ø3 mm Core, 6' (1.8 m) Length
$414.00
Today
LLG0338-8 Support Documentation
LLG0338-8Liquid Light Guide Ø3 mm Core, 8' (2.4 m) Length
$475.00
Today

Ø5 mm Core Liquid Light Guides

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LLG0538-4 Support Documentation
LLG0538-4Liquid Light Guide Ø5 mm Core, 4' (1.2 m) Length
$454.00
Today
LLG05-4H Support Documentation
LLG05-4HLiquid Light Guide Ø5 mm Core, 4' (1.2 m) Length, Yellow Banded End for HPLS345
$454.00
Today
LLG0538-6 Support Documentation
LLG0538-6Liquid Light Guide Ø5 mm Core, 6' (1.8 m) Length
$536.00
Today
LLG0538-8 Support Documentation
LLG0538-8Liquid Light Guide Ø5 mm Core, 8' (2.4 m) Length
$607.00
3-5 Days

SM1 Adapter for Liquid Light Guides

Liquid Light Guide in Stabilized Tungsten-Halogen Source
Click to Enlarge

View Imperial Product List
Item #QtyDescription
Imperial Product List
SLS201L1Stabilized Light Source
AD3LLG1Ø3 mm LLG to SM1 Adapter
SM1M051SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
LLG0338-41Liquid Light Guide Ø3 mm Core, 4' (1.2 m) Length
View Metric Product List
Item #QtyDescription
Metric Product List
SLS201L/M1Stabilized Light Source
AD3LLG1Ø3 mm LLG to SM1 Adapter
SM1M051SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
LLG0338-41Liquid Light Guide Ø3 mm Core, 4' (1.2 m) Length
An SM1 Adapter for Liquid Light Guides is used with a lens tube to couple the output of a light source into a liquid light guide. Adjusting the depth of the SM1 adapter in the lens tube is necessary in order to achieve maximum throughput.
  • Designed to Mate Ø3 mm or Ø5 mm Liquid Light Guides to SM1 Standard
  • External SM1 (1.035"-40) Threading

These Liquid Light Guide Adapters allow the integration of our Ø3 mm and Ø5 mm liquid light guides into any of our selection of SM1-threaded (1.035"-40) components, such as fixed optic mounts, kinematic optic mounts, and lens tubes. The LLG is secured with a nylon-tipped setscrew using a 5/64" hex key (found in the CCHK kit).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
AD3LLG Support Documentation
AD3LLGCustomer Inspired!Ø3 mm LLG to SM1 Adapter
$32.25
Today
AD5LLG Support Documentation
AD5LLGCustomer Inspired!Ø5 mm LLG to SM1 Adapter
$32.25
Today

Liquid Light Guide Adapter for Broadband Light Sources

Liquid Light Guide in Stabilized Lamp
Click to Enlarge

An SLSLLG2 LLG adapter, with a liquid light guide, attached to an SLS402 light source.
  • Compatible with SLS301, SLS401, and SLS402 Sources
  • Couples the Output of the Broadband Light Sources into a Liquid Light Guide
  • Adapters Designed for 185 nm - 2.1 µm or 350 - 700 nm Wavelength Range
  • Compatible with Ø3 mm and Ø5 mm Core Liquid Light Guides
  • SLSLLG2 Includes Integrated Electronic Shutter with External Controller

These Liquid Light Guide Adapters are designed to integrate with our SLS301, SLS401, and SLS402 broadband light sources to couple the output into Ø3 mm or Ø5 mm core liquid light guides (LLGs). The adapters contain a collimating lens that is externally SM2-threaded (Ø2.035"-40), allowing them to directly thread onto the collimation lens assembly without the need to remove or adjust either lens.

The SLSLLG1 is designed with an uncoated collimating lens, which provides a wide operating range from 185 nm - 2.1 µm. For superior performance from 350 nm - 700 nm, the SLSLLG2 and SLSLLG3 lenses use an AR-coated lens that provides improved coupling efficiency in this wavelength range. Additionally, the SLSLLG2 features an integrated diaphragm shutter and an external controller that can operate at continuous frequencies up to 10 Hz and burst frequencies up to 15 Hz. For more information on the integrated shutter, please refer to the manual.

All liquid light guide adapters come with a Ø3 mm LLG to SM1 (Ø1.035"-40) AD3LLG adapter preinstalled, making them compatible with Ø3 mm core liquid light guides out of the box. They are also shipped with a Ø5 mm LLG to SM1 (Ø1.035"-40) AD5LLG adapter, which can be swapped in by unthreading the AD3LLG and replacing it with the AD5LLG. This allows the adapters to connect with Ø5 mm core liquid light guides.

Item # SLSLLG1 SLSLLG2 SLSLLG3
Wavelength Range Uncoated: 185 nm - 2.1 µm AR Coated: 350 nm - 700 nm; Ravg < 0.5%
Integrated Electronic Shutter No Yesa No
Lens LA4464 ACL5040U-A
Lens Material UV Fused Silica B270 Optical Crown Glass
Coupling Efficiency SLS401 / SLS402 >30% (3 mm LLG); >35% (5 mm LLG) >30% (3 mm LLG); >40% (5 mm LLG)
SLS301 >15% (3 mm LLG); >25% (5 mm LLG) >20% (3 mm LLG); >30% (5 mm LLG)
  • The external controller included with the SLSLLG2 is the same as the one included with the SHB1. For additional information, please see the full presentation here.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SLSLLG1 Support Documentation
SLSLLG1Liquid Light Guide Adapter for Broadband Light Sources, 185 nm - 2.1 µm
$357.00
Today
SLSLLG2 Support Documentation
SLSLLG2Liquid Light Guide Adapter with Shutter for Broadband Light Sources, 350 nm - 700 nm
$1,279.00
Today
SLSLLG3 Support Documentation
SLSLLG3Liquid Light Guide Adapter for Broadband Light Sources, 350 nm - 700 nm
$216.00
3-5 Days

Multi-Optic Collimating Microscope Adapters for Thorlabs' Cerna Microscopes

Optical Specifications
Effective Focal Length 40 mm
Collimating Optics Achromatic Doublet &
Double Convex Lens
AR Coating 350 nm - 650 nm
Ravg <0.5% at Each Surface
Numerical Aperture 0.3
Magnification Infinite

Thorlabs offers collimation adapters to couple Ø3 mm or Ø5 mm liquid light guides (LLGs) to our CSE2100 Cerna Epi-Illumination Module. For even illumination at the back focal plane of the objective, these adapters feature an optic pair of an achromatic doublet and a double convex lens; see the table to the right for details.

These adapters utilize a male D3T dovetail adapter to connect to the end of the CSE2100. For additional information about the CSE2100 and microscope dovetails, see the full web presentation. The LLG is secured via a thumbscrew at the back of the adapter.

These adapters are calibrated such that the image plane from the LLG output is located at the back aperture of the objective when used with the CSE2100 epi-illuminator module; to optimize illumination for your microscope or realign the image plane, the collimation can be fine-adjusted via the knurled ring on the thread adapter (see image to the bottom left).

Cutaway View of LLG Collimation Adapter
Click to Enlarge

Cutaway View of LLG Collimation Adapter Depicting Multi-Element Design
LLG Collimator Focal Shift
Click for Details

These diagrams illustrate chromatic focal shift in a system with a collimated light source and a CSE2100 epi-illumination module. A collimation adapter with a single aspheric condenser lens (top) produces larger focal shift for different wavelengths at the objective back aperture compared to a collimation adapter with a multi-element design (bottom), like our LLGxA6 adapters.
LLG Collimator Performance
Click to Enlarge

This simulated image compares the chromatic focal shift at the objective back aperture when using an adapter with an aspheric condenser lens versus an LLGxA6 multi-element adapter. The various colors represent light rays of different wavelengths.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LLG3A6 Support Documentation
LLG3A6Ø3 mm LLG Collimating Adapter for Cerna CSE2100 Module, ARC: 350-650 nm
$450.00
3-5 Days
LLG5A6 Support Documentation
LLG5A6Ø5 mm LLG Collimating Adapter for Cerna CSE2100 Module, ARC: 350-650 nm
$450.00
Today

Single-Element Collimating Microscope Adapters

Microscope Collimator Connected to an HPLS
Click to Enlarge

Output With Collimation Adapter
LLG Without a Collimator
Click to Enlarge

Output Without Collimation Adapter
Microscope Collimator Connected to an HPLS
Click to Enlarge

Collimation Adapter Fitted to the Tip of a LLG

Thorlabs offers collimation adapters with AR-coated aspheric condenser lenses (EFL = 40 mm) for collimating the output from our High-Power Light Sources. Four different collimator housings are available; each is designed to mate to the illumination port on an Olympus IX/BX, Leica DMI, Zeiss Axioskop, or Nikon Eclipse Ti microscope.

These adapters quickly mount onto the end of either the Ø3 mm or Ø5 mm Liquid Light Guide (LLG). The LLG is secured into the back of the collimator via a 4-40 setscrew with a 0.050" hex. The addition of these adapters allows the user to incorporate our HPLS300 series lamps into a microscope illumination port.

Compatible
Microscopes
Olympus BX & IX
Microscopes
Leica DMI
Microscopes
Zeiss Axioskop
Microscopes
Nikon Eclipse Ti
Microscopes
Item Photo
(Click to Enlarge)
Olympus BX & IX Microscope Adapter Leica DMI Microscope Adapter Zeiss Axioskop Microscope Adapter Nikon Eclipse Ti Microscope Adapter
Item # LLG3A1-A LLG5A1-A LLG3A2-A LLG5A2-A LLG3A4-A LLG5A4-A LLG3A5-A LLG5A5-A
LLG Diameter 3 mm 5 mm 3 mm 5 mm 3 mm 5 mm 3 mm 5 mm
Optic Specifications
Item # ACL5040-A Aspheric Condenser Lens
AR Coating 350 nm - 700 nm,
Ravg <0.5%
at Each Surface
Focal Length 40.00 mm ± 5%
NA 0.554
Magnification Infinite
Surface Quality 60-40 Scratch-Dig
Centration <30 arcmin
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LLG3A1-A Support Documentation
LLG3A1-AØ3 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
$316.00
Today
LLG5A1-A Support Documentation
LLG5A1-AØ5 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
$316.00
Today
LLG3A2-A Support Documentation
LLG3A2-AØ3 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
$316.00
Today
LLG5A2-A Support Documentation
LLG5A2-AØ5 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
$316.00
Today
LLG3A4-A Support Documentation
LLG3A4-AØ3 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
$316.00
Today
LLG5A4-A Support Documentation
LLG5A4-AØ5 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
$316.00
Today
LLG3A5-A Support Documentation
LLG3A5-AØ3 mm LLG Collimating Adapter, Cerna CSE1000 and Nikon Eclipse Ti, ARC: 350-700 nm
$416.00
Today
LLG5A5-A Support Documentation
LLG5A5-AØ5 mm LLG Collimating Adapter, Cerna CSE1000 and Nikon Eclipse Ti, ARC: 350-700 nm
$416.00
Today
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