Laser Line Tunable Filter from Photon etc.

The LLTF CONTRAST supplied by Photon etc. is a unique optical filtering technology that is perfect for tunable excitation sources in fluorescence and Raman spectroscopy. This non-dispersive, sub-nm tunable bandpass filter transmits a single laser line and blocks unwanted lines.

The LLTF CONTRAST offers excellent efficiency and high out-of-band rejection. It is the only tunable filter with isolation higher than OD4 and is suitable for thin film characterization.

Key Features

The main features of the LLTF CONTRAST are:

  • Wide tuning range
  • High out-of-band rejection
  • Efficiency up to 60%
  • Free-space or fiber coupled
  • Compatible with any VIS-NIR broadband source
  • Easy-to-use control software
  • Ideal for thin film characterization


The specifications of the LLTF CONTRAST are provided in the table below:

Peak Transmission up to 60%
Isolation 60 dB at 20 nm of central wavelength
Grating Damage Threshold > 100 kW/cm2 average power
> 5 GW/cm2 peak power @ 1064 nm, 8 ns
Tuning Speed 2nm displacement: 90 ms
Min to Max: 600 ms
Pointing Stability < 1 mm lateral displacement @ 1m from filter
Max Beam Diameter
Dimensions (L x W x H)
9" x 6.3" x 6.7"
23 cm x 16 cm x 17 cm
Wavelength Relative Resolution FWHM/8
Operating Temperature 10 to 40°C
Storage Temperature 5 to 50°C
Software PHySpec included
Computer Connection USB 2.0 (compatible 1.1)
Power Supply 100 - 240 V, 50 -60 Hz
Options Free-space/Fibered Output, Order Filter, Calibration Module, Shutter, FWHM < 0.4 nm

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