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| Non-linear crystal Silver Thiogallate (AgGaS2 or AGS) | |
| Silver Thiogallate
(AgGaS2 or AGS) is transparent from 0.53 to 12 µm and
has been demonstrated to be an efficient frequency doubling crystal
for infrared radiation such as the 10.6 µm output of CO2 lasers.
Although nonlinear optical coefficient is the lowest among the
above mentioned infrared crystals, its high short wavelength transparency
edging at 550 nm is used in OPOs pumped by Nd:YAG laser; in numerous
difference frequency mixing experiments using diode, Ti:Sapphire,
Nd:YAG and IR dye lasers covering 3–12 µm range; direct infrared
countermeasure systems, and SHG of CO2 laser. With suitable pump lasers, AgGaS2 optical parametric oscillators (OPO's) can produce continuously tunable radiation over a wide range of wavelengths in the infrared. Using 2050 nm pump laser, an optimally designed AgGaS2 OPO is tunable from about 2.5 to 12.0 µm. The output range can be extended by the sum or difference frequency mixing (SFM/DFM). This crystal has a high non-linear coefficient, high damage threshold, and a wide transmission range. It also has low optical absorption and scattering, low wavefront distortion. Among commercially available crystals, AgGaS2 has the highest figure of merit for non-linear interactions in the near and deep infrared. The availability of this crystal has stimulated new activities exploiting its interesting properties. Potential applications include wavelength selectable medical procedures and a wide variety of spectroscopic applications. It is useful for high performance IR waveplates. It has also been shown as an excellent crystal for non-linear three-wave interactions. APPLICATIONS: <<<Back |
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