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	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	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	ε_11s=10 ε_11t=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

Linear Optical Properties:

Transparency Range	0.50-13.2 µm
Refractive Indices @ 1.064 µm @ 5.300 µm @ 10.60 µm	no 2.4521 2.3945 2.3472	ne 2.3990 2.3408 2.2934
Thermo-Optic Coefficients	dno/dt=15.4 x 10^-5/°C dne/dt=15.5 x 10^-5 /°C
Sellmeier Equations (λ in µm)	no²=3.3970+2.3982/(1-0.09311/λ²)+2.1640/(1-950/λ²) ne²=3.5873+1.9533/(1-0.11066/λ²)+2.3391/(1-1030.7/λ²)

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	γ_41T=4.0 pm/V γ_63T=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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