Nonlinear optical crystal AGS (AgGaS2)
AGS
(silver thiogallate)
Main properties
| Compound | AgGaS2 | |
| Transparency range, µm | 0.47 – 13 | |
| Nonlinear coefficient, pm/V | d36 = 12.6 @ 10.6 µm | |
| Negative uniaxial crystal | no > ne (at λ < 0.497 μm ne > no) | |
| Symmetry | Tetragonal, -42m point group | |
| Cell parameters, Å | a=5.757, c=10.311 | |
| Typical Reflection index |
10.6 µm 5.3 µm |
no=2.3475, ne=2.2918 no=2.3945, ne=2.3406 |
| Optical Damage Threshold, MW/cm2 | 1064 nm (t=10 ns) |
350 |
| Walk off angle, ° | 5.3 µm | 0.76 |
| Thermal conductivity k, WM/M°C | 1.5 | |
| Band-gap energy at room temperature, eV | Eg = 2.73 | |
| Optical activity ρ = 522deg/mm at isotropic point | n0= ne, λ = 0.4974 μm | |
| Absorption edge in the far-IR on 0.2 transparency level | 0.86 THz; 346 µm | |
The parameters of optical elements
| Orientation accuracy, arc min | < 30 | |
| Parallelism, arc sec | < 30 | |
| Flatness | 546 nm | λ/4 |
| Surface quality, scratch/dig | 30/20 | |
Application
- Efficient frequency doubling for mid-IR radiation
- Optical parametric oscilation and amplification, Different frequency generation to mid-infrared regions up to 12 µm
- Optical narrow-band filters in the region near isotropical point (0.4974 µm at 300 K)
Large/long optical elements are available, please, send your requests.
We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer’s specifications, reflectivity curves are applied upon request.