AGS(AgGaS2) 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. Lattice parameters: a = 5.757, c = 10.311 Å Melting Point: 997 °C Density: 4.702 g/cm3 Mohs Hardness: 3-3.5 Absorption Coefficient: 0.6 cm-1 @ 10.6 µm Relative Dielectric Constant @ 25: ε11s=10ε11t=14 parallel to c-axis：12.5 x 10-6 x °C-1 perpendicular to c-axis：-13.2 x 10-6 x °C-1
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Overview
Specifications
| Parameter | Value |
|---|---|
| Lattice parameters | a = 5.757, c = 10.311 Å |
| Non-linear coefficient d36 [10.6 um] | d36 = 12.5 pm/V |
| Optical damage threshold [10.6 um；150 ns] | 10 - 20 MW/cm2 |
| Crystal Structure | Tetragonal |
| Cell Parameters | a=5.756 Å, c=10.301 Å |
| Melting Point | 997 °C |
| Density | 4.702 g/cm3 |
| Mohs Hardness | 3-3.5 |
| Absorption Coefficient [10.6 µm] | 0.6 cm-1 @ 10.6 µm |
| Relative Dielectric Constant [25 MHz] | ε11s=10ε11t=14 |
| Thermal Expansion Coefficient | ||C: -13.2 x 10-6 /oC⊥C: +12.5 x 10-6 /oC |
| Thermal Conductivity | 1.5 W/M/°C |
| Wavefront distortion [633 nm] | less than λ/6 @ 633 nm |
| Dimension tolerance | (W +/-0.1 mm) x (H +/-0.1 mm) x (L +0.2 mm/-0.1 mm) |
| Clear aperture | > 90% central area |
| Flatness [633 nm；T>=1.0mm] | λ/6 @ 633 nm for T>=1.0mm |
| Surface Quality [MIL-O-13830A] | Scratch/dig 20/10 per MIL-O-13830A |
| Parallelism | better than 1 arc min |
| Perpendicularity | 5 arc minutes |
| Angle tolerance | Δθ < +/-0.25o, Δφ < +/-0.25o |
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