Nonlinear optical crystal LIS (LilnS2)
LIS
(lithium indium sulphide)
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 |
| 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.