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High quality Infrared nonlinear crystals GaSe 、AGS、AGGS、AGSe

Gallium Selenide (GaSe) non-linear optical single crystal have large non-linear coefficient, a high damage threshold and a wide transparency range. GaSe crystals is a very suitable material for SHG in the mid infrared. GaSe has been successfully used for efficient SHG of CO2 laser.
SHG materials: Gallium Selenide (GaSe) crystals

Another material which is very suitable for SHG in the mid-IR is Gallium Selenide (GaSe) non-linear optical single crystal. GaSe crsytals combines a large non-linear coefficient, a high damage threshold and a wide transparency range. The frequency-doubling properties of GaSe were studied in the wavelength range between 6.0 µm and 12.0 µm.
Gallium Selenide （GaSe）crystal

Gallium Selenide （GaSe） nonlinear optical single crystals combining a large nonlinear coefficient, a high damage threshold. GaSe crystals is suitable material for SHG in the mid-IR and typical materials for THz radiation generation.
BBO Crystal

BBO is a new ultraviolet frequency doubling crystal. BBO is a negative uniaxial crystal, with ordinary refractive index (no) larger than extraordinary refractive index (ne). Both type I and type II phase matching can be reached by angle tuning.
Zinc Sulphide (ZnS) Crystals

ZnS is a very important optical crystals applied in IR waveband. Transmitting range of CVD is 8um-14um. high transmittance low absorbtion. ZnS with multi-spectrum level by heating etc. static pressure technics has improved the transmittance of IR and visible range.
AGS Crystals

AGS is transparent from 0.50 to 13.2 µm. Although its nonlinear optical coefficient is the lowest among the mentioned infrared crystals, high short wavelength transparency edging at 550 nm is made use of in OPOs pumped by Nd:YAG laser; in numerous difference frequency mixing experiments with diode, Ti:Sapphire, Nd:YAG and IR dye lasers covering 3–12 µm range; in direct infrared countermeasure systems, and for SHG of CO2 laser. Thin AgGaS2 (AGS) crystal plates are popular for ultrashort pulse generation in mid IR range by difference frequency generation employing NIR wavelength pulses.