HgGa2S4 Crystal

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