AgGaSe2 Crystals
Silver Gallium Selenite (AgGaSe2, AGSE) crystal is of special interest for the middle and deep infrared (IR) applications due to its large nonlinear optical coefficients and high transmission in the IR region. Its IR cutoff wavelength of ~ 18 µm is much longer than that of the closely related crystal Silver Gallium Sulfide (AgGaS2, AGS) crystal. The phase matching and non-linear optical properties of AgGaSe2 allow OPO/OPA's pumped with lasers at 1400-2100 nm (e.g. Ho:YLF laser at 2050 nm ) and different frequency generation (DFG) to generate tunable middle or deep infrared wavelengths.
Newlight Photonics offers AgGaSe2 crystals with a typical aperture of 5x5 mm and a thickness of 0.5 - 3.0 mm. Other dimensions are available upon request.
| Part No. | Description | Application | Thickness | Price | Availability | Add to Cart |
Structure and Physical Properties:
| Crystal Structure | Tetragonal |
| Cell Parameters | a=5.992 Å, c=10.886 Å |
| Melting Point | 851 °C |
| Density | 5.700 g/cm3 |
| Mohs Hardness | 3-3.5 |
| Absorption Coefficient | <0.05 cm-1 @ 1.064 µm <0.02 cm-1 @ 10.6 µm |
| Relative Dielectric Constant @ 25 MHz | ε11s=10.5 ε11t=12.0 |
| Thermal Expansion Coefficient | ||C: -8.1 x 10-6 /°C ⊥C: +19.8 x 10-6 /°C |
| Thermal Conductivity | 1.0 W/M/°C |
Linear Optical Properties:
| Transparency Range |
0.78-18.0 μm |
|
| Refractive Indices @ 1.064 µm @ 5.300 µm @ 10.60 µm |
no 2.7010 2.6134 2.5912 |
ne 2.6792 2.5808 2.5579 |
| Thermo-Optic Coefficient |
dno/dt=15.0 x 10-5/°C |
|
| Sellmeier Equations ( λ in µm) |
no2=4.6453+2.2057/(1-0.1879/λ2)+1.8577/(1-1600/λ2) ne2=5.2912+1.3970/(1-0.2845/λ2)+1.9282/(1-16007/λ2) |
|
Nonlinear Optical Properties:
| NLO Coefficients @ 10.6 µm |
d36=d24=d15=39.5 pm/V
|
| Linear Electro-optic Coefficients |
γ41T=4.5 pm/V
γ63T=3.9 pm/V |
| Damage Threshold @ ~ 10 ns, 1.064 µm |
20-30 MW/cm2 (surface)
|
Specifications of AgGaSe2 components:
| Dimension tolerance: (W +/-0.1 mm) x (H +/-0.1 mm) x (L + 0.2 mm/-0.1 mm) |
| Clear aperture: > 90% central area |
| Flatness: λ/4 @ 633 nm for T>=1 mm |
| Surface Quality: Scratch/dig 20/10 |
| Parallelism: better than 60 arc seconds |
| Perpendicularity: 5 arc minutes |
| Angle tolerance: Δθ < +/-0.25o, Δφ < +/-0.25o |
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