Thin AgGaS2 Crystals

Thin AgGaS2 Crystals
Thin AgGaS2 Crystals Thin AgGaS2 Crystals

Silver Gallium Sulfide (AgGaS2, AGS) is very useful for middle and deep 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 in the mid and near IR. It has been used as an efficient NLO crystal for frequency mixing involving 3 - 10 µm IR pulses such as OPA pumped by a Ti:Sapphire laser and DFG or SFG of the signal/idler pulses from an OPA. 

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 0.01 cm-1@ 1.064 µm
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/8 @ 633 nm 
Surface Quality: Scratch/dig 20/10 per MIL-O-13830A 
Parallelism: better than 20 arc seconds 
Perpendicularity: 5 arc minutes
Angle tolerance: Δθ < +/-0.25o, Δφ < +/-0.25o


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