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Liquid Light Guides


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

AD3LLG

Ø3 mm Liquid Light Guide
to SM1 Adapter

LLG3A1-A

Collimating Adapter

LLG0338-8

Liquid Light Guide

Application Idea

LLG with HPLS Microscope
Collimating Adapter

Related Items

LLG Closeup
Close-Up of Liquid Light Guide End

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 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. 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 are recommended for use with tungsten halogen, xenon, or metal halide light sources and can be mounted to an optical breadboard by using one of our VH1 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 in lengths of 4', 6', and 8' with a core diameter of either 3 or 5 mm, and their long-term temperature range is -5 to 35 °C. LLGs with custom lengths are also available as made-to-order items by contacting Technical Support.

Thorlabs also offers microscope collimation adapters for the Ø3 mm and Ø5 mm liquid light guides. These adapters allow the LLGs to be directed into the illumination ports used by various microscope manufacturers. For more information, please see below.

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 DiameterStandard End FittingsProtective SleeveMin. Bending Radius
d0d1l1d2l2d3 
3 mm5 +0/-0.1 mm20 ± 0.1 mm9 ± 0.1 mm24 ± 0.1 mm7 ± 0.1 mm40 mm
5 mm7 +0/-0.1 mm20 ± 0.1 mm10 ± 0.1 mm24 ± 0.1 mm9.5 ± 0.1 mm60 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 I2.

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.

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
AD3LLG Support Documentation AD3LLG : Ø3 mm LLG to SM1 Adapter
AD5LLG Support Documentation AD5LLG : Ø5 mm LLG to SM1 Adapter
LLG0338-4 Support Documentation LLG0338-4 : Liquid Light Guide Ø3 mm Core, 4' (1.2 m) Length
LLG0338-6 Support Documentation LLG0338-6 : Liquid Light Guide Ø3 mm Core, 6' (1.8 m) Length
LLG0338-8 Support Documentation LLG0338-8 : Liquid Light Guide Ø3 mm Core, 8' (2.4 m) Length
LLG0538-4 Support Documentation LLG0538-4 : Liquid Light Guide Ø5 mm Core, 4' (1.2 m) Length
LLG0538-6 Support Documentation LLG0538-6 : Liquid Light Guide Ø5 mm Core, 6' (1.8 m) Length
LLG0538-8 Support Documentation LLG0538-8 : Liquid Light Guide Ø5 mm Core, 8' (2.4 m) Length
Part Number Product Description
LLG3A1-A Support Documentation LLG3A1-A : Ø3 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
LLG3A2-A Support Documentation LLG3A2-A : Ø3 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
LLG3A4-A Support Documentation LLG3A4-A : Ø3 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
LLG3A5-A Support Documentation LLG3A5-A : Ø3 mm LLG Collimating Adapter, Nikon Eclipse Ti, ARC: 350-700 nm
LLG5A1-A Support Documentation LLG5A1-A : Ø5 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
LLG5A2-A Support Documentation LLG5A2-A : Ø5 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
LLG5A4-A Support Documentation LLG5A4-A : Ø5 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
LLG5A5-A Support Documentation LLG5A5-A : Ø5 mm LLG Collimating Adapter, Nikon Eclipse Ti, ARC: 350-700 nm

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Posted Comments:
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: 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: 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
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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/Imperial Price Available / Ships
LLG0338-4 Support Documentation
LLG0338-4 Liquid Light Guide Ø3 mm Core, 4' (1.2 m) Length
$345.00
Today
LLG0338-6 Support Documentation
LLG0338-6 Liquid Light Guide Ø3 mm Core, 6' (1.8 m) Length
$405.00
Today
LLG0338-8 Support Documentation
LLG0338-8 Liquid Light Guide Ø3 mm Core, 8' (2.4 m) Length
$465.00
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/Imperial Price Available / Ships
LLG0538-4 Support Documentation
LLG0538-4 Liquid Light Guide Ø5 mm Core, 4' (1.2 m) Length
$445.00
Today
LLG0538-6 Support Documentation
LLG0538-6 Liquid Light Guide Ø5 mm Core, 6' (1.8 m) Length
$525.00
Today
LLG0538-8 Support Documentation
LLG0538-8 Liquid Light Guide Ø5 mm Core, 8' (2.4 m) Length
$595.00
3-5 Days

SM1 Adapter for the Liquid Light Guides

  • 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 liquid light guide 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/Imperial Price Available / Ships
AD3LLG Support Documentation
AD3LLG Customer Inspired! Ø3 mm LLG to SM1 Adapter
$31.50
Today
AD5LLG Support Documentation
AD5LLG Customer Inspired! Ø5 mm LLG to SM1 Adapter
$31.50
Today

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

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, Nikon Eclipse, 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 via a setscrew into the back of the collimator. The addition of these adapters allows the user to incorporate our HPLS200 series lamps into a microscope illumination port.

Optic Specifications
Item # ACL5040-A
AR Coating 350 nm - 700 nm
Focal Length 40.00 mm ± 5%
NA 0.554
Magnification Infinite
Surface Quality 60-40 Scratch-Dig
Centration <30 arcmin
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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
LLG3A1-A Support Documentation
LLG3A1-A Ø3 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
$300.00
Today
LLG5A1-A Support Documentation
LLG5A1-A Ø5 mm LLG Collimating Adapter, Olympus BX / IX, ARC: 350-700 nm
$300.00
Today
LLG3A2-A Support Documentation
LLG3A2-A Ø3 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
$300.00
Today
LLG5A2-A Support Documentation
LLG5A2-A Ø5 mm LLG Collimating Adapter, Leica DMI, ARC: 350-700 nm
$300.00
Today
LLG3A4-A Support Documentation
LLG3A4-A Ø3 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
$300.00
Today
LLG5A4-A Support Documentation
LLG5A4-A Ø5 mm LLG Collimating Adapter, Zeiss Axioskop, ARC: 350-700 nm
$300.00
Today
LLG3A5-A Support Documentation
LLG3A5-A Ø3 mm LLG Collimating Adapter, Nikon Eclipse Ti, ARC: 350-700 nm
$395.00
Today
LLG5A5-A Support Documentation
LLG5A5-A Ø5 mm LLG Collimating Adapter, Nikon Eclipse Ti, ARC: 350-700 nm
$395.00
3-5 Days
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