Cr:YAG Crystals
Cr:YAG (Chromium doped Ytterium Aluminum Garnet, Cr:Y3Al5O12) crystal is an ideal material for passive Q-switching of Nd:YAG and other Nd or Yb doped lasers in the wavelength range of 0.8 to 1.2 μm. One of the remarkable features of Cr:YAG is its high damage threshold of 500-1000 MW/cm2. Its absorption band extends from 800 nm to 1200 nm and peaks at around 1060nm with a very large absorption cross section. Passive Q-switched lasers incorporating Cr:YAG crystals have been extensively manufactured at low cost and with reduced system size and weight.
| Part No. | Application | Aperture | Coating | Price | Availability | Add to Cart |
Basic Properties:
| Chemical Formula | Cr4+:Y3Al5O12 |
| Crystal Structure | Cubic garnet |
| Recovery time | 8.5 μs |
| Hardness | 8.5 Mohs |
| Density | 4.56 g/cm3 |
| Thermal conductivity | 12.13 W/m/K |
| Refractive index | 1.82 @ 1064 nm |
| Ground state absorption cross section | σs1=4.3x10-18 cm2 |
| Excited state absorption cross section | σs2=8.2x10-19 cm2 |
| Fluorescence lifetime | 3.4 μs |
Specifications of Cr:YAG components:
| Orientation: | The rod axis is along <111> or <100> |
| Cr4+ concentration: | 0.5 mol% ~ 3 mol% |
| Aperture | 2x2 ~ 14x14 mm |
| Length: | 0.1 ~ 12 mm |
| Initial transmission (T0): | 5% ~ 99% |
| T0 tolerance: | +/- 2% |
| Flatness: | λ /8 @ 633 nm |
| Parallelism: | 20 arc sec |
| Perpendicularity: | 5 arc minutes |
| Surface finishing: | 20/10 scratch/dig to MIL-O-13830A |
| Wavefront distortion: | less than λ/8 @ 633 nm |
Anti-Reflection (AR) Coating:
AR coatings are available @ 1064 nm or other wavelengths. The typical reflectance is R < 0.20% per surface.
Typical AR coating curve @ 1064 nm:
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