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	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	0.01 cm^-1@ 1.064 µm 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/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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