|
Chromium doped
yttrium aluminum garnet or Cr4+:YAG has higher damage threshold and is mostly used in passively Q-switching diode
pumped or lamp pumped passive Q-switching materials. Its main advantages
are high damage threshold, and absorptions wavelength of 900nm--1200nm,
and peak of around 1060nm with large absorption section.
Red Optronics supplies a wide variety of finished crystals. Our general production of Cr4+:YAG
follows.
Specification:
| Cr4+ dopant concentration: |
0.5 mol% ~
3 mol% |
| Aperture: |
2x2 ~
14x14mm |
| Length: |
0.1 ~
12mm |
| Initial
transmission: |
10% ~
99% |
| Coating: |
Antireflective |
Typical specification and
tolerance:
| Angle
tolerance: |
Δθ< ±
0.5°; Δφ< ±0.5° |
| Dimension
tolerance: |
(W ±
0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
| Flatness: |
λ/8 @
633nm |
| Scratch/Dig code: |
10/5 Scracth/dig per MIL-O-13830A |
| Parallelism: |
better
than 20 arc seconds |
| Perpendicularity: |
5 arc
minutes |
| Wavefront
distortion: |
less than
λ/8 @ 633nm |
| Clear
aperture: |
> 90%
central area |
Note:
To inquire or order a
finished Cr4+ crystals, please provide specification
as listed above, particularly the size, initial transmission
and coatings.
Physical and Optical
Properties:
| Chemical
Formula |
Cr4+:Y3A15O12 |
| Crystal
Structure |
Cubic
garnet |
| Recovery
time |
8.5μs |
| Hardness |
8.5
Mohs |
| Density |
4.56g/cm |
| Orientation |
[100]+/-10° |
| Thermal
conductivity |
12.13w/m/kv |
| Refractive
index |
1.82 @
1064nm |
| Base state
absorption cross section |
σs1=4.3x10-18cm2 |
| Emission
state absorption cross section |
σs2=8.2x10-19cm2 |
| Fluorescence lifetime |
3.4us |
|
