A High Power, Solid State and Compact Passive Q-switch
Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight. Cr
4+:YAG (Y3Al5O12) is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Yb:YAG or other Nd and Yb doped lasers at wavelength from 1.0 to 1.2 mm. Because of its chemically stable, durable, UV resistant, good thermal conductivity and high damage threshold (> 500 MW/cm2) and being easy to be operated, it will replace traditional materials, such as, LiF, organic Dye and color centers.| Basic Properties of Cr4+:YAG | |
Formula |
Cr4+:Y3Al5O12 |
Crystal Structure |
Cubic Garnet |
Dopant Level |
0.5 mol% ~ 3 mol% |
Hardness |
8.5 (Mohs) |
Damage Threshold |
> 500 MW/cm2 |
Refractive Index |
1.82 @ 1064 nm |
| Main Specifications | |
Flatness |
< l/8 |
Wavefront Distortion |
< l/4 |
Parallelism |
< 30Ħħ |
Surface quality |
20/10 scratch/dig |
AR-coating |
R<0.2% @ 1064 nm |
Standard Aperture |
3X3 ~ 10X10 mm |
AR-coatings and HR-coatings are also available. We can control the initial transmission(To) from 10% to 95% according to customers's requirements. Standard size of 3X3 mm2 with T0=80% or 90% in inventory for immediate delivery. Please refer to page 62, Diode Pumped Laser Optics Kits for more information.
The preliminary experiments of CASIX's
Cr:YAG showed that the pulse width of passively Q-switched lasers could be as short as 9 ns for diode pumped Nd:YAG lasers and repetition as high as 10kHz for diode pumped Nd:YVO4 lasers. Furthermore, an efficient green output @ 532 nm, and UV output @ 355 nm and 266 nm were generated, after a subsequent intracavity SHG in KTP or LBO, THG and 4HG in LBO and BBO for diode pumped and passive Q-switched Nd:YAG and Nd:YVO4 lasers.Cr:YAG is also a laser crystal with tunable output from 1.35
mm to 1.6 mm. It can generate ultrashort pulse laser (to fs pulsed) when pumped by Nd:YAG laser at 1.064mm. Note: When ordering Cr4+:YAG crystal, please specify the aperture, initial transmission(To) and coatings.Copyright 1998 CASIX, Inc. All rights reserved.
Last Revised: May 19, 1999
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