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Laser Line Tunable Filter

The Laser Line Tunable Filter (LLTF CONTRAST) is a non-dispersive tunable bandpass filter based on volume Bragg gratings. It combines very high optical density (> OD6), an outstanding out-of-band rejection, and wide tunability. The LLTF can be customized to cover the entire 400 nm to 2500 nm spectral range with a high spectral resolution.

It can be coupled with a wide variety of broadband sources to create a tunable laser source. It can also be used as a cleanup filter for spectroscopy applications.

There are numerous possible LLTF configurations whose spectral range and bandwidth can be finely tuned to fit specific needs. The specifications below of several tried-and-tested standard models may serve as a starting point.

Product Specifications

Technical Specifications
CONTRAST-SR-VIS CONTRAST-SR-SWIR CONTRAST-EXT IV CONTRAST-X
Spectral range 400-1000 nm 1000-2300 nm (2500 nm optional) 400-2300 nm (2500 nm optional) X represents a custom spectral range
Bandwidth (FWHM) < 2.5 nm < 5.0 nm 400-1000 nm, < 2.5 nm 1000-2300 nm, < 5.0 nm 0.15 - 0.9 nm
Out-of-band rejection <-60dB@±40nm, <-30dB@±10nm <-60dB@±80nm, <-30dB@±20nm <-60dB@±40nm, <-30dB@±10nm <-60dB@±80nm, <-30dB@±20nm Depends on the bandwidth
Peak efficiency Typically around 65% Typically around 65% Typically around 65% Typically around 65%
Optical density (OD) > OD6 (measured at 1064 nm) > OD6 (measured at 1064 nm) > OD6 (measured at 1064 nm) Depends on spectral range
Stabilization time / wavelength step 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm 20 ms < 1 nm; 25 ms / 1 nm; 28 ms / 2 nm; 35 ms / 5 nm; 50 ms / 10 nm
Dimensions (L x W x H) 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm) 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm) 11.8 x 9.1 x 6.7 (inches), 30 x 23 x 17.4 (cm) 9 x 6.3 x 6.7 (inches), 23 x 16 x 17 (cm)
Options & Accessories
CONTRAST-SR-VIS CONTRAST-SR-SWIR CONTRAST-EXT IV CONTRAST-X
Fibered output A Øx-Øy rotation adjustment allows coupling optimization A Øx-Øy rotation adjustment allows coupling optimization A Øx-Øy rotation adjustment allows coupling optimization A Øx-Øy rotation adjustment allows coupling optimization
Harmonic filter Blocks the harmonics coming from the region 400-500 nm Blocks the harmonics coming from the regions 500-850 nm and/or 850-1150 nm Blocks the harmonics coming from the regions 400-500 nm and/or 500-850 nm and/or 850-1150 nm The filter is chosen according to the spectral range
Alignement kit In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment In free space configuration (input/output), the alignment kit allows the user to rapidly find the correct alignment

Videos

Introduction to the Laser Line Tunable Filter - LLTF

The LLTF combines a wide spectral tunability (400-2300 nm) with the highest out-of-band rejection (< -60 dB) available on the market. When coupled to a supercontinuum source, the LLTF is an ideal tool for spectroscopy, calibration and hyperspectral imaging.

White Papers

Abstract

The Laser Line Tunable Filter (LLTF) is a non-dispersive, widely tunable bandpass optical filter. At its core lies a volume Bragg grating (VBG) which efficiently selects and filters all but a narrow spectral window from a broadband light source. The LLTF provides a wider tunable range than other commercially available tunable filters. A single filter has the potential to offer full continuous…

Widely Tunable Filter: Technology & Measurement of Critical Specifications

Authors Daniel Gagnon and Laura-Isabelle Dion-Bertrand

Abstract

The out-of-band rejection and the optical density (OD) are two critical specifications of tunable filters. Unfortunately, these properties are often misinterpreted and their definitions tend to differ from one manufacturer to another. End users need to be careful when looking over the specifications of a filter. Also, the measurement of these properties for customers can be laborious. One needs…

Custom products

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