AgGaGeS4

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AgGaGeS4 (Silver Germanium Gallium Sulfide) is a negative biaxial crystal with an orthogonal crystal system and a larger nonlinear coefficient than AgGaS. Compared with conventional materials, AgGaGeS4 has the following characteristics:

  • A wide transmission band (0.5~11.5 μm),
  • A small absorption coefficient (α<0.005 cm-1)
  • A high threshold of laser damage resistance (30 ns, 9.55 μm, 230 MW/cm2), which is about 1.6 times that of AgGaS2(149 MW/cm2), ZnGeP2 (142 MW/cm2), 1.6 times
  • Suitable for titanium gem 800 nm, Nd: YAG 1 μm laser pumping birefringence (0.057)
  • Can be applied to CO2 laser frequency doubling
  • Can withstand high-power laser pumping
  • Output high-power mid and far-infrared laser

Features of AgGaGeS4

  • High output power
  • Low absorption coefficient
  • High laser damage threshold
  • Withstand high power laser pumping
  • High nonlinear optical coefficient, wide transmission range

Physicochemical Properties

Nonlinear Optical Coefficientd31=15 pm/V
Transmission Range0.5-11.5µm
Absorption Coefficient0.05 cm-1@1064 nm
Damage Threshold＞1.2J/cm2@1064nm
Crystal StructureOrthogonal System, Fdd2 Space Group
Crystal Cell Parametersa=12.015Å,
b=22.904Å,
c=6.874Å
Melting Point850℃
Band Gap2.78eV
Through Range0.5-11.5μm
Birefringence0.0751@0.5μm
0.0656@0.6μm
0.0582@0.8μm
0.0555@1.064μm
0.0545@2μm
0.0516@4μm
0.0333@10.6μm
0.0301@11.5μm

Processing Parameters

Directional Accuracy<+-0.1°
Surface Finish 20/10 per MIL-O-13830A 
Surface Typeλ/8@632.8nm 当 T>=1mm
Smooth Surface Tolerance+0/-0.1mm
Length Tolerance±0.1mm
Parallelism30 ″
Perpendicularity10′
Bevel<0.2mm×45°

Spectrum

AgGaGeS4 nonlinear crystal transmittance curve crylink
Thickness 3.6 mm AgGaGeS4 Chip transmittance curve

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