AgGaS2 — Nonlinear Optical Infrared Crystals
Product Description
Thin AgGaS2 (AGS) crystal plates are popular for ultrashort pulse generation in mid IR range by difference frequency generation employing NIR wavelength pulses.
Applications
● Generation second harmonics on CO and CO2 - lasers
● Optical parametric oscilator
● Different frequency generator to middle infrared regions up to 12 mkm.
● Frequency mixing in the middle IR region from 4.0 to 18.3 µm
● Tuneable solid state lasers (OPO pumped by Nd:YAG and others lasers operating in 1200 to 10000 nm region with efficiency 0.1 to 10 %)
● Optical narrow-band filters in the region near isotropic point (0.4974 m at 300 °K), transmission band being tuned at temperature variation
● Up-conversion of CO2 laser radiation image into near-IR or visible region by using/ or use of Nd:YAG, ruby or dye lasers with efficiency up to 30 %
Features
● Transmission in 0.25-5.0 mm, no absorption in 2-3 mm
● High thermal conductivity
● High index of refraction and Non-birefringence
Basic 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 | 0.50-13.2 um | |
| Refractive Indices | no | ne |
| @ 1.064 um | 2.4521 | 2.3990 |
| @ 5.300 um | 2.3945 | 2.3408 |
| @ 10.60um | 2.3472 | 2.2934 |
| Thermo-Optic Coefficients |
dno/dt=15.4 x 10-5/°C dne/dt=15.5 x 10-5/°C |
|
| Sellmeier Equations (ʎ in um) | no2=3.3970+2.3982/(1-0.09311/ʎ2) +2.1640/(1-950/ʎ2) ne2=3.5873+1.9533/(1-0.11066/ʎ2) +2.3391/(1-1030.7/ʎ2) |
|
Nonlinear Optical Properties
| Phase-Matching SHG Range | 1.8-11.2 um |
| NLO Coefficients @ 1.064 um | d36=d24=d15=23.6 pm/V |
| Linear Electro-optic Coefficients |
Y41T=4.0 pm/V Y63T=3.0 pm/V |
| Damage threshold @ ~ 10 ns, 1.064 um | 25 MW/cm2(surface), 500 MW/cm2(bulk) |
Basic Parameters
| Wavefront distortion | less than λ/6 @ 633 nm |
| 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/6 @ 633 nm for T>=1.0mm |
| Surface Quality | Scratch/dig 20/10 per MIL-O-13830A |
| Parallelism | better than 1 arc min |
| Perpendicularity | 5 arc minutes |
| Angle tolerance | Δθ < +/-0.25o, Δφ < +/-0.25o |
