Silver Gallium Sulfide
Melting Point:851 °C. Density:5.700 g/cm3. Mohs Hardness:3-3.5. Wavefront Distortion:less than λ/6 @633 nm. Flatness:λ/6 @633 nm. Surface Quality:20/10. Parallelism:better than1 arc min. Perpendicularity:5 arc minutes. AgGaS2 and AgGaSe2 are among the most effective nonlinear laser crystals for the infrared. Large nonlinear coefficients, high infrared transmission, low optical absorption and scattering, and low wavefront distortion have encouraged their increasing infrared use. These crystals are currently described as the best choice for frequency doubling of CO2 lasers emitting at10.6μm. Owing to differences between the crystals, AgGaSe2 is commonly used in wavelength-selective medical devices, lidar, all-solid-state tunable infrared sources, laser spectroscopy instruments, and infrared waveplates. The differing short-wavelength transmission of AgGaS2 leads to applications in Nd:YAG OPOs, difference-frequency generation in IR dye lasers, and directional infrared countermeasure systems.
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