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AgGaS2 crystals
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AgGaS2 crystals

Main features

 

  • Unique non-linear properties across the transmission range from 0,5 to 12 µm
  • Low optical absorption and scattering
  • Transparency at short wavelengths

 

Application examples

 

  • Frequency mixing in the middle IR region from 4,0 to 18,3 µm
  • Second harmonic generation and up-conversion for CO2 lasers
  • Tunable OPO for solid-state lasers
Request custom
  • Description
  • Properties
  • Standard specifications

Silver Thiogallate (AgGaS2, AGS) has been demonstrated as an efficient crystal for nonlinear parametric interactions in the infrared spectral range. Its transparency region ranges from 0,53 to 12 µm. AGS based optical parametric oscillators feature continuously tunable radiation over a wide range of wavelengths in the infrared spectral range. High transparency in the short wavelength range beginning at 550 nm is used in OPOs pumped by Nd:YAG laser.
Using 2050 nm pump laser, an optimally designed AgGaS2 OPO is tunable from about 2,5 to 12,0 µm. The output range can be extended by the sum or difference frequency mixing (SFM/DFM). This crystal features a high non-linear coefficient, high damage threshold, and a wide transmission range. It also exhibits a low optical absorption and scattering, low wavefront distortion. AgGaS2 has the highest figure of merit for non-linear interactions in the near and deep infrared. 

Physical and optical properties
Chemical formula AgGaS2
Crystal structure Tetragonal, 42m
Lattice parameters a = 5,742 Å, c = 10,26 Å
Optical symmetry Negative uniaxial (no > ne, λ < 0,497 μm ne > no)
Density 4,58 g/cm3
Mohs hardness 3-3,5
Transparency range 0,47 - 13 µm @”0“ transmittance level
Sellmeier equations @T = 293 K (λ in µm) no2 = 5,79419 + 0,23114/(λ2 - 0,06882) - 2,4534 × 10−3 λ2 + 3,1814 × 10−7 λ4 - 9,7051 × 10−9 λ6;
ne2 = 5,54120 + 0,22041/(λ2 - 0,09824) - 2,5240 × 10−3 λ2 + 3,6214 × 10−7 λ4 - 8,3605 × 10−9 λ6
Refractive indices no = 2,3471; ne = 2,2914 @ 10,6321 µm
Thermal conductivity 1,4 (||c) Wm-1K-1, 1,5 (⊥ c) Wm-1K-1
AgGaS2 crystals
Orientation accuracy <30 arcmin
Clear aperture 85%
Face dimensions tolerance +0,0/-0,2 mm
Parallelism error <30 arcsec
Perpendicularity error <10 arcmin
Protective chamfers <0,2 mm at 45°
Surface quality 60-40 S-D
Coatings BBAR/[email protected],2-2,6 µm/2,6-11 µm
Mount Unmounted
Order your item
Face dimensions Length Theta Phi Coatings Application SKU PRICE QUANTITY
5x5 mm
1 mm
39°
45°
BBAR/[email protected],2-2,6/2,6-11 μm
[email protected],2-2,6 μm, type I
7356
Request
8x8 mm
1 mm
39°
45°
BBAR/[email protected],2-2,6/2,6-11 μm
[email protected],2-2,6 μm, type I
7395
Request
6x6 mm
2 mm
50°
BBAR/[email protected],2-2,6/2,6-11 μm
[email protected],2-2,6 μm, type II
7396
Request
8x8 mm
2 mm
50°
BBAR/[email protected],2-2,6/2,6-11 μm
[email protected],2-2,6 μm, type II
7397
Request