AgGaS2 Crystals

AgGaS2 Crystals
AgGaS2 Crystals AgGaS2 Crystals

Silver Gallium Sulfide (AgGaS2, AGS) crystal is useful for the near and mid-infrared applications due to its large nonlinear optical (NLO) coefficients and high transmission in the IR region. The phase matching and transmission characteristics of AgGaS2 allow 3-wave interactions involving a very wide wavelength range in the near and mid-IR. It has been used as an efficient NLO crystal for 3 - 10 µm IR generation, particularly for OPO/OPA pumped by a Nd:YAG laser at 1064 nm or a Ti:sapphire laser at 800 nm, and frequency mixing (SFG or DFG) between the signal/idler wavelengths from an OPO/OPA.  AgGaS2  is also an efficient frequency doubling crystal for infrared radiation such as 10.6 μm from CO2 lasers. 

Newlight Photonics offers AgGaS2 crystals with a typical aperture of 5x5 mm. Larger apertures up to 10x10 mm are available upon request. The thickness can be as small as 0.2 mm. 

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Part No. Description Application Thickness Price Availability Add to Cart


Structure and Physical Properties:

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 0.6 cm-1 @ 10.6 µm
Relative Dielectric Constant @ 25 MHz ε11s=10
Thermal Expansion Coefficient  ||C: -13.2 x 10-6 /oC
⊥C: +12.5 x 10-6 /oC
Thermal Conductivity 1.5 W/M/°C


Linear Optical Properties:
Transparency Range

0.50-13.2 µm

Refractive Indices
@ 1.064 µm
@ 5.300 µm
@ 10.60 µm
Thermo-Optic Coefficients

dno/dt=15.4 x 10-5 /°C
dne/dt=15.5 x 10-5 /°C

Sellmeier Equations
(λ in µm)

Nonlinear Optical Properties:

Phase-Matching SHG Range
1.8-11.2 µm
NLO Coefficients @ 1.064 µm
d36=d24=d15=23.6 pm/V
Linear Electro-optic Coefficients
γ41T=4.0 pm/V
γ63T=3.0 pm/V
Damage threshold
         @ ~ 10 ns, 1.064 µm
25 MW/cm2 (surface),
500 MW/cm2 (bulk)

Typical Transmission Curve (L=10 mm, Internal):


Specifications of AGS components:

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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