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AGS is transparent from 0.53 to 12 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.

Applications:

● Generation second harmonics on CO and CO2 - lasers

● Optical parametric oscilator

● Different frequency generator to middle infrared regions up to 12 mkm.

● Frequency mixing in the middle IR region from 4.0 to 18.3 μm

● Tuneable solid state lasers (OPO pumped by Nd:YAG and others lasers operating in 1200 to 10000 nm region with efficiency 0.1 to 10 %)

● Optical narrow-band filters in the region near isotropic point (0.4974 m at 300 °K), transmission band being tuned at temperature variation

● Up-conversion of CO2 laser radiation image into near-IR or visible region by using/ or use of Nd:YAG, ruby or dye lasers with efficiency up to 30 %

Basic properties
Crystal Structure	Tetragonal
Cell Parameters	a=5.992 ?, c=10.886 ?
Melting Point	851 °C
Density	5.700 g/cm3
Mohs Hardness	3-3.5
Absorption Coefficient	<0.05 cm-1 @ 1.064 μm <0.02 cm-1 @ 10.6 μm
Relative Dielectric Constant @ 25 MHz	ε11s=10.5 ε11t=12.0
Thermal Expansion Coefficient	\|\|C: -8.1 x 10-6 /°C ⊥C: +19.8 x 10-6 /°C
Thermal Conductivity	1.0 W/M/°C

Linear Optical Properties
Transparency Range	0.50-13.2 um
Refractive Indices	no	ne
@ 1.064 um	2.4521	2.3990
@ 5.300 um	2.3945	2.3408
@ 10.60um	2.3472	2.2934
Thermo-Optic Coefficients	dno/dt=15.4 x 10-5/°C dne/dt=15.5 x 10-5/°C
Sellmeier Equations (? in um)	no2=3.3970+2.3982/(1-0.09311/?2)+2.1640/(1-950/?2) ne2=3.5873+1.9533/(1-0.11066/?2)+2.3391/(1-1030.7/?2)

Nonlinear Optical Properties
Phase-Matching SHG Range	1.8-11.2 um
NLO Coefficients @ 1.064 um	d36=d24=d15=23.6 pm/V
Linear Electro-optic Coefficients	Y41T=4.0 pm/V Y63T=3.0 pm/V
Damage threshold @ ~ 10 ns, 1.064 um	25 MW/cm2(surface), 500 MW/cm2(bulk)
Basic Parameters
Wavefront distortion	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	λ/6 @ 633 nm for T>=1.0mm
Surface Quality	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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