Silver Gallium Selenite (AgGaSe₂ or AGSE) Crystals
Silver Gallium Selenite (AgGaSe₂ or AGSE), along with AgGaS₂, are useful NLO crystals, with large nonlinear (NLO) coefficients, which can operate in the infra-red (IR) part of the spectrum. AgGaSe2 has been proven in a broad range of NLO applications.

AGSE strengths/features include:
  • Transparency range - 0.7 to 18μm
  • Large NLO coefficient of 33pm/V @10.6μm
  • Proven performance in SFM/DFM interactions in the near and mid IR
  • Wide spectral and angular acceptances

AGSE applications include:
  • High efficiency SHG using CO₂ 10.6μm) and CO(5-6μm) lasers
  • OPO pumped by Ho:YLF(2.05μm) with a tunable output of 2.5 - 12μm
  • OPO pumped by Nd:YAG(1.06μm)
  • DFM pumped by Diode, IR Dye, Nd:YAG and Ti:Sapphire with outputs over range 3 - 12μm
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AgGaS2 Crystal - Availability
  • Format:
Rods, Discs and Slabs
  • Sizes:
Diameter: 5mm max and Length: 10mm max
AgGaSe2 Crystal Properties
Laser / Optical Properties Units Value
Transmission/Transparency Range µm 0.73 - 18.0
Refractive Index (n) @1.06µm n₀ = 2.7010
ne = 2.6792
@5.3µm n₀ = 2.6134
ne = 2.5808
@10.6µm n₀ = 2.5912
ne = 2.5579
Non-linear Coefficient @10.6µm (d36) pm/V 39.5
Phase Matching Angle - Type I SHG@10.6um º 55
Walk Off @5.3µm º 0.67
Absorption Coefficient @1.06µm cm‾¹ <0.05
@2.5µm cm‾¹ <0.01
@5.0µm cm‾¹ <0.01
@7.5µm cm‾¹ TBA
@10.0µm cm‾¹ <0.02
@11.0µm cm‾¹ TBA
Physical / Thermal Properties Units Value
Chemical Formula AgGaSe₂
Crystal Symmetry Tetragonal
Point Group 42M
Melting Point ºC 851
Thermal Expansion Coeff. @20ºC 10‾⁶/ºC ┴ 19.8
║ -8.1
Thermal Conductivity Coeff. @20ºC W/m/ºK 1
Specific Heat J/g K TBA
Density g/cm³ 5.7
Mohs Hardness 3 - 3.5
Optical Damage Threshold @1.064,10ns MW/cm² 20 - 30
AgGaSe2 Crystal - Sellmeier Equations
n₀²(λ) = 4.6453 + 2.2057/(1 - 0.1879/λ²) + 1.8577/(1 - 1600/λ²)

ne²(λ) = 5.2912 + 1.3970/(1 - 0.2845/λ²) + 1.9282/(1 - 1600/λ²)