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Cr:YAG
(Chromium Doped
Yttrium Aluminum Garnet, Cr:Y3Al5O12)
Cr:YAG 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 800nm to1200nm 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.
Please contact Newlight
Photonics Inc. for crystal sizes and
initial transmissions for your
applications.
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=4.3x10-18cm2 |
|
Excited state absorption cross section |
σs2=8.2x10-19cm2 |
|
Fluorescence lifetime |
3.4 μs |
Specifications on
Finished Products
| Orientation:
|
The rod axis is along [100]
|
| Cr4+
concentration: |
0.5 mol% ~ 3 mol% |
| Aperture |
2x2 ~ 14x14 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
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| Surface finishing:
|
20/10 scratch/dig to
MIL-O-13830A |
| Wavefront distortion:
|
less than λ/8 @ 633 nm
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Anti-Reflection
(AR) Coating
AR coatings are
available upon request @ 1064nm or other wavelengths. The typical reflectance is R < 0.20% per surface.
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