LiGaS2

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LiGaS2 (Lithium Gallium Sulfide, LGS), a new infrared nonlinear optical material (space group Pna21, point group mm2) with a fibrillated zincite structure. It is expected to be a new generation of nonlinear optical material with excellent overall performance due to its large nonlinear optical coefficient (d31=5.8 @2.26μm), wide transmission band (0.33~12 μm), large enough birefringence (Δn=0.04), and low two-photon absorption. 

LiGaS2 is expected to be a new generation of nonlinear optical material with excellent comprehensive performance in the mid-infrared band. 

Moreover, LiGaS2 has a wideband gap of 4.15 eV among the mid-infrared nonlinear crystals and is, therefore, effectively used in tunable laser systems in a wide spectral range.

Features of LiGaS2

  • High damage threshold
  • Large band gap width
  • Low two-photon absorption
  • Stable physical and chemical properties
  • Wide transparent range
  • Low group velocity mismatch

Basic Parameters

Crystal SystemOrthogonal Crystal System
Through Range, µm0.33 – 11.6
Symmetrymm2
Band Gap, eV4.15
Nonlinearity Coefficient, pm/V(@2.3 µm)d31=5.8;
d24=5.1;
d33= -10.7
Far infrared absorption edge at 0.2 transmittance level92µm
3.25THz
Damage Threshold, MW/cm2（1064 nm，t=14 ns)>240
Coefficient of Thermal Conductivity, WM/M°C6-8 calc.
SHG Scope1.47 - 7.53
Melting Point1050℃
Birefringence~0.04（1-10 μm）

Specifications

Perpendicularity< 30’
Parallelism< 30’’
Flatnessλ/4＠546nm
Surface Qualityscratch/dig，30/20

Spectrum

LiGaS2 nonlinear crystal transmittance crylink

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