Narrow-band tunable optical filter made of a CdGa2S4 single crystal

An optical polarization filter was constructed from a CdGa₂S₄ single crystal. This filter was temperature-tunable in the range 487–580 nm. Its pass band was 2 nm and the transmission at the maximum of the spectral characteristic was 48%. The filter was also capable of withstanding high-power laser radiation (damage threshold 32 MW/cm²).