GaSe

GaSe

GaSe crystals are a nonlinear optical material. They have the following features:

  • High damage broadening resistance
  • A large nonlinear coefficient (54 pm/V)
  • A transmission band between 0.65 and 18 μm
  • An ultra-low absorption coefficient

Those make them very important for mid-infrared broadband electromagnetic wave oscillations. GaSe crystals have achieved applications in:

  • SHG of CO2 lasers
  • Conversion of CO2 laser radiation conversion to visible or near-infrared wavelengths.
  • Mixing studies in the mid-wave infrared, OPG light generation in the 3.5-18 μm range.
  • Efficient terahertz generation in the 0.2-5 THz range during femtosecond pulse pumping.

Features of GaSe Crystals:

  • Large nonlinear coefficient
  • High damage threshold
  • Wide transmission range
  • Ultra low absorption coefficient
  • Broadband terahertz oscillation
  • SHG conversion efficiency of CO2 laser reaches 9%

Product Parameters

MaterialGaSe
Transparency range, µm0.62 – 20
Nonlinear Coefficient, pm/Vd22 = 54 @10.6 µm
Crystal SystemHexagonal system, point group 6m2
Lattice Constant, Åa=3.74, c=15.89
Refractive Index
no=2.6975, ne=2.3745 @10.6 µm
no=2.7233, ne=2.3966 @5.3 µm
Damage Threshold, MW/cm2@1064 nm (t=10 ns)30
Walk-off Angle4.1° @5.3 µm
Mohs Hardness
2
Density
5.03g/cm3
Forbidden Bandwidth (300K)2.2eV

Spectrum

Nonlinear crystal GaSe transmittance -CRYLINKNonlinear crystal GaSe transmittance -CRYLINK
Transmission spectrumTransmission spectrum of 17 mm long uncoated GaSe crystal
Nonlinear crystal GaSe phase matching angle -CRYLINK
Type Ⅰ and Type Ⅱ octave phase matching curves in GaSe

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