Nonlinear optical crystal LIS (LilnS2)

LIS

(lithium indium sulphide)

common2

LIS a

Main properties

Compound LiInS2
Transparency range, µm 0.35– 13.2 
Nonlinear coefficient, pm/V d31=7.25, d24=5.66 @2.3 
Symmetry Orthorombic, mm2 point group 
Cell parameters, Å a=6.893, b=8.0578, c=6.4816 
Typical
Reflection
index
1064 nm
532 nm

nx=2.1305, ny=2.1668, nz=2.1745
nx=2.2353, ny=2.2841, nz=2.2919

The fundamental wavelength ranges in µm for SHG x-y, Type II, eoe 2.35 – 6.11

x-z, Type I, ooe

1.78 – 8.22

y-z, Type II, oeo

2.35 – 2.67

y-z Type II, oeo

5.59 – 6.11

Total interval covered

1.617 – 8.71

Optical Damage Threshold, GW/cm2 1064 nm
(t=14 ns)

40 

Thermal conductivity k, WM/M°C kx=6.1 ± 0.3; ky=5.9 ± 0.3; kz=7.4 ± 0.3
Absorption edge in the far-IR on 0.2 transparency level

2.58 THz at 118 µm

The parameters of optical elements

Orientation accuracy, arc min < 30
Parallelism, arc sec < 30
Flatness 546 nm λ/6
Surface quality, scratch/dig 30/20

Application

  • Optical parametric oscilation (OPO) in range 1 – 12 µm with pump Ti: Sapphire laser
  • Different frequency generation in middle IR range (2-12 µm)

We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.

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