LilnSe２

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LilnSe2 (Lithium Selenide), called LISe crystal, is a point group of mm2. The light transmission range is 0.43~13.2 μm. The effective nonlinear coefficient is large (d31=11.78, d24=8.17 @2.3 μm). It can be applied to pump titanium Sapphire laser. Optical parametric oscillation (OPO) can obtain 1-13 μm mid-infrared laser output and different frequencies in the mid-infrared range (2-13 μm).

Features of LilnSe2 Crystal:

  • Small band gap, suitable for neutron detection
  • High heat conductivity
  • High laser damage threshold
  • Crystal growth is not easy to crack
  • Good neutron recognition capability
  • It is not easy to crack during growth

Optical Element Parameters

Positional Accuracy<30’
Parallelism
<30’’
Flatness
λ/4@546nm
Surface Finish
30/20 sratch/dig

Physicochemical Properties

Crystal Structure
Orthorhombic，
point group: mm2，
space groups: Pna21
Lattice Parameters Åa=7.192, b=8.412, c=6.793 
Transparency range
0.43-13μm
Nonlinear Coefficient pm/Vd31=11.78, d24=8.17 @2.3μm
Standard Reflectance@10.0 µm nx=2.2015, ny=2.2522, nz=2.2566
@5.0 µm nx=2.2370, ny=2.2772, nz=2.2818
SHG Fundamental Frequency Light Rangex-y, Type II, eoe：2.73 – 8.24μm
 x-z, Type I, ooe： 2.08 – 12.4μm
y-z, Type II, oeo：2.73 – 3.07μm
y-z Type II, oeo， 7.66 – 8.24μm
Total wavelength coverage：2.08 – 12.4μm
Damage Threshold，GW/cm240 @1064 nm   (t=10 ns)
Thermal Conductivity
，WM/M°C		kx=4.73 ± 0.3; ky=4.67 ± 0.3; kz=5.45 ± 0.3
Band gap energy at room temperature2.73eV
Far infrared absorption edge at 0.2 level of transmittance1.24 THz @240 µm

Spectrum

Nonlinear Crystal LilnSe2 transmittance-CRYLINK

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