High values of laser damage threshold and conversion efficiency allow to use Mercury Thiogallate HgGa2S4 (HGS) non-linear crystals for frequency doubling and OPO/OPA in the wavelength range from 1.0 to 10 µm. It was established that SHG efficiency of CO2 laser radiation for 4 mm length HgGa2S4 element is about 10 % (pulse duration 30 ns, radiation power density 60 MW/cm2). The high conversion efficiency and wide range of radiation wavelength tuning allows to expect that this material may compete with AgGaS2, AgGaSe2, ZnGeP2 and GaSe crystals in spite of the considerable difficulty of big size crystals growth process.

APPLICATIONS:
   • Generation second harmonics on CO and CO2 - lasers
   • Different frequency generator to middle infrared regions.
   • Optical parametric oscilator
   • Frequency mixing in the middle IR region

Literature: F. Rotermund, V. Petrov and F. Noack, Difference-frequency generation of intense femtosecond pulses in the mid-IR (4-12 µm) using HgGa2S4 and AgGaS2.

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