Nonlinear optical crystals LGS (LiGaS2)
LGS
Main properties
| Compound | LiGaS2 | |
| Transparency range, µm | 0.33 – 11.6 | |
| Symmetry | mm2 | |
| Band gap, eV | 4.15 | |
| Nonlinear susceptibility, pm/V (at 2.3 µm) |
d31=5.8; d24=5.1; d33= -10.7 |
|
| Absorption edge in the far-IR on 0.2 transparency level | µm | 92 |
| THz | 3.25 | |
| Optical Damage Threshold, MW/cm2 | 1064 nm (t=14 ns) |
>240 |
| Thermal conductivity k, WM/M°C | 6-8 calc. | |
| SHG cut off | 1.47 - 7.53 | |
The parameters of optical elements
| Compound | LiGaS2 | |
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
LGS is a very recently proposed IR new nonlinear materials with a wurtzite-type structure and UV transmission down to 0.32. OPO, OPA, DFG to obtain mid-IR.
Crystals of LiBC2 group are characterised by a set of important physical parameters, such as large band gap, low two photon absorption, wide transparency range, including THz window, low group velocity mismatch, high thermal conductivity, low anisotropy of thermal expansion coefficient, etc. which lead to effective use in tunable laser systems in wide spectral range.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.