AgGaSe2 is an optically negative uniaxial crystal with a reasonable transmittance over roughly 0.7μm-18μm region.
Features:
Excellent properties across the transmission range from 0,73 to 18 µm
Low optical absorption and scattering
High FOM (figure of merit) for non-linear interactions in NIR and MIR
Applications:
Frequency mixing in the IR region from 4,0 to 18,3 µm
Second harmonic generation and up-conversion for CO2 lasers
Tunable OPO for solid-state lasers with efficiency up to 10%
Performance comparison of commonly used mid-infrared birefringent uniaxial crystals:
Material | ZnGeP2 | AgGaSe2 | CdGaAs2 | CdS | CdSe |
Energy gap(eV) | 2.02 | 1.83 | 0.67 | 2.42 | 1.73 |
Absorption Coef, λ=10.6µm | 0.9cm-1 | 0.089cm-1 | 0.14cm-1 | 0.007cm-1 | 0.0015cm-1 |
Refractive index, λ=10.6µm | no=3.0738 | no=2.5917 | no=3.5054 | no=2.2245 | no=2.4258 |
ne=3.1137 | ne=2.5585 | ne=3.5922 | ne=2.2376 | ne=2.4437 | |
Max. light | 55 | 65 | 60 | 70 | 71 |
Transmittance | 0.7-12µm | 0.7-19µm | 0.7-20µm | 2.5-15µm | 0.8-25µm |
Mohs hardness | 5.5 | 3-3.5 | 3.5-4 | 3.4 | 3.25 |
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