Laser Crystals: Cr4+:YAG
Cr4+:YAG (Y3Al5O12) (Chromium Doped Yttrium Aluminum Garnet ) is an ideal material for passive Q-switching of Nd:YAG and other Nd and Yb doped lasers in the wavelength range of 0.8 to 1.2 mm. One of the remarkable features of Cr4+:YAG is high damage threshold (better than 500 MW/cm2). Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight.
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 @ 1064nm |
| Ground state absorption cross section | σs1=4.3×10-18cm2 |
| Excited state absorption cross section | σs2=8.2×10-19cm2 |
| Fluorescence lifetime | 3.4 μs |
We offer Cr:YAG Specifications
| Orientation: | The rod axis is along [100] within5°,[111] and [110] within5° |
| Cr4+ concentration: | 0.5 mol% ~ 3 mol% |
| Aperture | 2×2 ~ 20×20 mm |
| Length: | 0.1 ~ 12 mm |
| Initial transmission: | 5% ~ 99% |
| Angle tolerance: | Δθ< ± 0.5°; Δφ< ±0.5° |
| 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 |
| Coating | AR/HR/PR coating upon customer’s request |
Note: When ordering Cr4+:YAG crystal, please specify the aperture, initial transmission(To) and coatings.
Cr:YAG crystals with various ion doped YAG diffusion bonded are also available from us.
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