AgGaS2

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AgGaS2(Silver Gallium Sulfide, AGS) crystal is a typical I-III-VVI2 chalcopyrite structure compound semiconductor, light yellow at room temperature, crystal infrared transparency range is wide. 

The nonlinear coefficient is large, has a large birefringence (~ 0.054), an energy gap of 2.75eV, a high-quality factor, high threshold of optical damage. It can be used for second harmonic generation and frequency, optical parametric oscillation, etc. 

In particular, AgGaS2 crystal as a parametric upconversion device can achieve 90° non-critical phase matching at room temperature. It can convert infrared light in the 10.2~11.6 μm band to 0.566 μm green light in the range of 0~100 °C. These are important for remote sensing applications, ranging and spectroscopic measurements with tuned CO2 lasers as detection light sources. 

AgGaS2 crystal is a new type of advanced infrared nonlinear optical material with excellent performance, which has important research value and application prospects in the fields of infrared detection, infrared remote control, infrared monitoring, laser communication, national defense, science and technology.

Features of AgGaS2 Crystal:

  • Low light absorption
  • High conversion efficiency
  • Wide transmittance range
  • Large nonlinear optical coefficients
  • Low scattering short wavelength transmission

Basic Features

Chemical FormulaAgGaS2
Through Range0.47 - 13µm
Crystal StructureTetragonal System
Lattice Constanta=5.756Å，c=10.301 Å
Density4.48g/cm3
Mohs Hardness3.0 - 3.5
Nonlinear Coefficient @10.6 μm, pm/Vd36 = 12.5 pm/V
Melting Point993℃
Absorption Coefficient<0.05 cm-1 @ 1.064 µm
<0.02 cm-1 @ 10.6 µm
Negative Single Crystal Axisno>ne(ne>no when λ<0.497µm)
Thermal Conductivity1.0 W/M/℃
SHG Phase Matching1.8-11.2 µm
Damage Resistance Threshold@10 ns, 1.064 um30 MW/cm2(surface)
Thermal Expansion Coefficient||C: -8.1 x 10-6 /℃
⊥C: +19.8 x 10-6 /℃
Thermo-optic Coefficientdno/dt=15.4 x 10-5/℃
dne/dt=15.5 x 10-5/℃ 
Sellmeier Equation (λ in μm) T=20℃no2=3.3970+2.3982λ2/( λ2– 0.09311) +2.1640 λ2 /(λ2-950);
ne2=3.5873+1.9533λ2/(λ2 – 0.11066) + 2.3391λ2/(λ2-1030.7)
Bandgap2.7eV
Birefringence0.0231@0.53 µm
0.0504@0.694 µm
0.0542@1.06 µm
0.0533@5.3 µm
0.0542@10.6 µm

Processing Parameters

Orientation Accuracy<+-0.1°
Surface Finish20/10 per MIL-O-13830A 
Face Shapeλ/8@632.8nm for T>=1mm
Clear Surface Tolerance+0/-0.1mm
Length Tolerance±0.1mm
Parallelism30 ″
Perpendicularity10′
Bevel<0.2mm×45°

Spectrum

Nonlinear crystal AgGaSe2 phase matching CRYLINKNonlinear crystal AgGaSe2 transmittance-CRYLINK
Transmission Spectrum of AgGaS2 CrystalTransmission spectra of 14 mm long coated and uncoated AgGaS2 crystals for Nd:YAG laser-pumped OPO
Nonlinear crystal AgGaSe2 transmittance-CRYLINK
AgGaS2 Type 1 OPO and SHG Phase Matching Curves

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