Cr4+:YAG Crystal is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO4 or other Nd and Yb doped lasers at wavelength from 0.8 to 1.2 μm. 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.

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CASTECH provides Cr 4+ :YAG with Cr 4+ doping level from 0.5mol% to 3mol%.  The size could be from 2×2mm2 to 14×14mm2 with length from 0.1mm to 12mm available.  We can control the initial transmission from 10% to 92% according to customers'  requirements.


Table 1. Basic Properties of  Cr4+:YAG

Crystal Structure     


Dopant Level

0.5 mol% ~ 3 mol%             



Damage Threshold

> 500 MW/cm2

Refractive Index

1.82 @ 1064 nm


       The preliminary experiments of CASTECH's Cr 4+ :YAG showed that the pulse width of passively Q-switched lasers could be as short as 5ns for diode pumped Nd:YAG lasers and repetition as high as 10kHz for diode pumped Nd:YVO4 lasers. Furthermore, an efficient green output @ 532nm, and UV output @ 355nm and 266nm 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 4+ :YAG is also a laser crystal with tunable output from 1.35 μm to 1.55 μm. It can generate ultrashort pulse laser (to fs pulsed) when pumped by Nd:YAG laser at 1.064 μm.



       When ordering Cr 4+ :YAG crystal, please specify the size, initial transmission and coatings. For further information, please contact CASTECH.

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