Quality Inspection for Silica Window - AgGaSe2 Crystals – Dien
Quality Inspection for Silica Window - AgGaSe2 Crystals – Dien Detail:
AgGaSe2 crystals have band edges at 0.73 and 18 µm. Its useful transmission range (0.9–16 µm) and wide phase matching capability provide excellent potential for OPO applications when pumped by a variety of different lasers. Tuning within 2.5–12 µm has been obtained when pumping by Ho:YLF laser at 2.05 µm; as well as non-critical phase matching (NCPM) operation within 1.9–5.5 µm when pumping at 1.4–1.55 µm. AgGaSe2 (AgGaSe2) has been demonstrated to be an efficient frequency doubling crystal for infrared CO2 lasers radiation.
• Generation second harmonics on CO and CO2 - lasers
• Optical parametric oscillator
• Different frequency generator to middle infrared regions up to 18 um.
• Frequency mixing in the middle IR region
Standard cross sections are 8x 8mm, 5 x 5mm, Crystal length range from 1 to 30 mm. Custom sizes are also available on request.
| 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 |
0.73-18.0 um |
|
| Refractive Indices @ 1.064 um @ 5.300 um @ 10.60 um |
no |
ne |
| Thermo-Optic Coefficient |
dno/dt=15.0 x 10-5/°C |
|
| Sellmeier Equations ( ʎ in um) |
no2=4.6453+2.2057/(1-0.1879/ʎ2)+1.8577/(1-1600/ʎ2) ne2=5.2912+1.3970/(1-0.2845/ʎ2)+1.9282/(1-16007/ʎ2) |
|
|
Nonlinear Optical Properties |
|
| NLO Coefficients @ 10.6 um | d36=d24=d15=39.5 pm/V |
| Linear Electro-optic Coefficients | Y41T=4.5 pm/V Y63T=3.9 pm/V |
| Damage Threshold @ ~ 10 ns, 1.064 um |
20-30 MW/cm2(surface) |
|
Technical Properties |
|
| Dimension tolerance | (W +/-0.1 mm) x (H +/-0.1 mm) x (L + 1 mm/-0.5 mm) |
| Clear aperture | > 90% central area |
| Flatness | λ/8 @ 633 nm for T>=1 mm |
| Surface Quality | Scratch/dig 60-40 after coating |
| Parallelism | better than 30 arc seconds |
| Perpendicularity | 10 arc minutes |
| Orentation accuracy | <30’’ |
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By Sara from Hongkong - 2017.08.15 12:36
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