HGS Nonlinear Crystal
HGS Nonlinear Crystal
Due to its high damage threshold and high conversion efficiency, the HgGa₂S₄ (HGS) nonlinear crystal is particularly suitable for frequency doubling in the 1-10 μm range, as well as for OPO/OPA applications. For a 4 mm long HgGa₂S₄ element, the frequency doubling efficiency for CO₂ laser radiation is approximately 10% (pulse duration of 30 ns, radiation power density of 60 MW/cm²). Although growing large HGS crystals is quite challenging, their high conversion efficiency and broad radiation wavelength tuning range make them a promising competitor to AgGaS₂, AgGaSe₂, ZnGeP₂, and GaSe crystals.
Key Features and Applications
- Frequency doubling of CO and CO₂ lasers
- Optical parametric oscillation (OPO)
- Difference frequency generation (DFG) in the mid-infrared region
- Mixing frequencies in the mid-infrared region
Specifications
| Parameter | Specifications |
|---|---|
| Transmission range | 0.55~13.00 µm |
| Negative uniaxial crystal | n o >n e |
| Point group | 4 |
| Mohs hardness | 3~3.5 |
| Density | 4.95 g/cm3 |
| Bandgap | 2.34 eV |
| Refractive indices | n o =2.6592; n e =2.5979 @0.5495 μm |
| Nonlinear coefficients | d 36 (1.064um)=1.8; d 36 (AgGaS 2 )±15%=(35.2±5.3)pm/V |
| LIDT | 60~90MW/cm2(1064nm, 10ns) |
Data Sheet: HGS Nonlinear Crystal (PDF)
Dimensions, orientation and coatings are made to order - send us your specification for a quotation.
