Liquid Light Guides

Item #	LLG3-4T	LLG03-4H	LLG3-6H	LLG3-8H	LLG3-4Z
Wavelength Range	220 - 650 nm	340 - 800 nm			420 - 2000 nm
Numerical Aperture	0.42	0.59			0.52
Half Angle (θ)	25°	36°			31°
Minimum Bend Radius	50 mm	40 mm			40 mm
Operating Temperature Range	5 to 30 °C (41 to 86 °F)	-5 to 35 °C (23 to 95 °F)			5 to 35 °C (41 to 95 °F)
Transmission (Click for Plot)
Available Lengths	4' (1.2 m)	4' (1.2 m)	6' (1.8 m)	8' (2.4 m)	4' (1.2 m)
Input End Indicator	N/A	Yellow Banda			Yellow Bandb

• On the LLG03-4H, LLG3-6H, and LLG3-8H, the yellow band indicates the necessary insertion depth when used with our previous-generation HPLS343 high-power plasma light source. The LLG is correctly inserted when the edge of the band is flush with the front panel of the instrument.
• On the LLG3-4Z, the yellow band indicates the end that must be used as the input because it contains a filter to protect the light guide from radiation below 420 nm.

Item #	LLG5-4T	LLG05-4H	LLG5-6H	LLG5-8H	LLG5-4Z
Wavelength Range	220 - 650 nm	340 - 800 nm			420 - 2000 nm
Numerical Aperture	0.42	0.59			0.52
Half Angle (θ)	25°	36°			31°
Minimum Bend Radius	70 mm	60 mm			60 mm
Operating Temperature Range	5 to 30 °C (41 to 86 °F)	-5 to 35 °C (23 to 95 °F)			5 to 35 °C (41 to 95 °F)
Transmission (Click for Plot)
Available Lengths	4' (1.2 m)	4' (1.2 m)	6' (1.8 m)	8' (2.4 m)	4' (1.2 m)
Input End Indicator	N/A	Yellow Banda			Yellow Bandb

• On the LLG05-4H, LLG5-6H, and LLG5-8H, the yellow band indicates the necessary insertion depth when used with our previous-generation HPLS345 high-power plasma light source. The LLG is correctly inserted when the edge of the band is flush with the front panel of the instrument.
• On the LLG5-4Z, the yellow band indicates the end that must be used as the input because it contains a filter to protect the light guide from radiation below 420 nm.

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View Imperial Product List

Item #	Qty	Description
Imperial Product List
SLS201L	1	Stabilized Fiber-Coupled Light Source w/ Universal Power Adapter, 360 - 2600 nm, 1/4"-20 Taps
AD3LLG	1	Ø3 mm LLG to SM1 Adapter
SM1M05	1	SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
LLG03-4H	1	Liquid Light Guide, Ø3 mm Core, 340 - 800 nm, 4' (1.2 m) Length
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View Metric Product List

Item #	Qty	Description
Metric Product List
SLS201L/M	1	Stabilized Fiber-Coupled Light Source w/ Universal Power Adapter, 360 - 2600 nm, M6 Taps
AD3LLG	1	Ø3 mm LLG to SM1 Adapter
SM1M05	1	SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
LLG03-4H	1	Liquid Light Guide, Ø3 mm Core, 340 - 800 nm, 4' (1.2 m) Length
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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.

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• 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).

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An SLSLLG2 LLG adapter, with a liquid light guide, attached to an SLS402 light source.

• Collimate Light from or Couple Light into Ø3 mm and Ø5 mm Core Liquid Light Guide
• Externally SM2-Threaded (2.035"-40) Mounting Threads
• 185 nm - 2.1 µm or 350 - 700 nm Wavelength Range
• SLSLLG2 Includes Integrated Electronic Shutter with External Controller
• Directly Compatible with SLS301, SLS401, and SLS402 Broadband Light Sources

These Liquid Light Guide Adapters allow the integration of our Ø3 mm and Ø5 mm liquid light guides into any of our selection of SM2-threaded (2.035"-40) components, in particular our SLS301, SLS401, and SLS402 broadband light sources. The adapter can be directly threading onto a light source without the need to adjust the position of the collimating 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.

Thorlabs offers collimation adapters to couple Ø3 mm or Ø5 mm liquid light guides (LLGs) to our CSE2100 and CSE2200 Cerna Epi-Illuminator Modules; see the table at the bottom right for compatibility information. 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.

These adapters utilize a male D3T dovetail adapter to connect to the end of the epi-illuminator module; for additional information about 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 compatible 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).

Specifications
Item #	LLG3A6	LLG5A6	LLG3A7	LLG5A7
Effective Focal Length	40 mm		70 mm
Compatible Epi-Illuminator Module	CSE2100		CSE2200
LLG Diameter	3 mm	5 mm	3 mm	5 mm
Collimating Optics	Achromatic Doublet & Double Convex Lens
AR Coating	350 nm - 650 nm Ravg < 0.5% at Each Surface
Transmission Graph (Click Here for Raw Data)
Numerical Aperture	0.3
Magnification	Infinite

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Cutaway View of LLG Collimation Adapter Depicting Multi-Element Design

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These simulations illustrate chromatic focal shift in a system with a collimated light source and a CSE2100 epi-illuminator module. A collimation adapter using a single optic (top) produces a larger focal shift for different wavelengths at the objective back aperture compared to a collimation adapter with a multi-element design (bottom).

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Output With Collimation Adapter

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Output Without Collimation Adapter

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Collimation Adapter Fitted to the Tip of an LLG

Thorlabs offers collimation adapters with AR-coated aspheric condenser lenses (EFL = 40 mm) for collimating the output from our 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.

Compatible Microscopes	Olympus BX & IX Microscopes		Leica DMI Microscopes		Zeiss Axioskop Microscopes		Nikon Eclipse Ti Microscopes
Item Photo (Click to Enlarge)
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