The Laser Line Tunable Filter (LLTF) is a non-dispersive tunable bandpass filter based on volume holographic gratings. It delivers the highest signal throughput in the industry, and is also unique in that it combines very high optical density (> OD6) and outstanding out-of-band rejection with wide tunability.

A single filter can be tuned from 400 nm to 1000 nm (VIS) or 1000 nm to 2300 nm (SWIR), with bandwidths (FWHM) of <2.5 nm and <5 nm respectively. Custom and extended spectral ranges (up to 2500 nm) and bandwidths (sub-nm) are also available. Photon etc’s LLTF can be coupled with a supercontinuum laser to provide a Tunable Laser Source (TLS).

We offer the following models of Laser Line Tunable Filters:

CONTRAST-SR-VIS
Spectral Range: 400-1000 nm
Bandwidth: < 2.5 nm

CONTRAST-SR-SWIR
Spectral Range: 1000-2300 nm (2500 nm optional)
Bandwidth: < 5.0 nm

CONTRAST-EXT IV
Spectral Range: 400-2300 nm (2500 nm optional)
Bandwidth: 400-1000 nm, < 2.5 nm 1000-2300 nm, < 5.0 nm

CONTRAST-X
Spectral Range: Custom
Bandwidth: 0.15 - 0.9 nm