Cr4+:YAG 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 a wavelength of 0.8-1.2µm. Because of its high damage threshold ( > 500MW/cm2) and being easy to be operated, it will replace LiF and Dye which are commonly used as passive Q-switching materials.



Basic Properties of Cr4+:YAG

Molecular Formula:


Crystal Structure:

Cubic Granet


Hardness: 8.5 (Mohs)
Damage Threshold: > 500MW/cm2
Reflective Index: 1.82 @ 1064nm



Sinoceramics provides Cr4+:YAG with Cr4+ doping level from 0.5 – 3mol%. The size could be from 2×2 mm2 with length from 0.1 – 12mm. AR-coatings and HR-coatings are also available. We can control the
transmission from 1% to 99% according to the customers’ requests.


For Cr:YAG, 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 at 532nm and UV output at 355nm and 266nm were generated, after a subsequent intra-cavity SHG in KTP or LBO, THG in LBO, or BBO and 4HG in BBO for diode pumped, passive Q-switched Nd:YAG and Nd:YVO4 lasers.


Cr:YAG is also a laser crystal with tunable output from 1.35-1.6mm. It can generate ultra short pulse laser (to femtosecond pulsed) when pumped by Nd:YAG laser at 1064mm


Cr4+:YAG crystal has been demonstrated as a self-pumped phase-conjugate mirror in a nanosecond Nd:YAG high power loop resonator. It compensates not only for phase aberrations, but also for polarization aberrations induced into the loop resonator.





< λ /8 @ 633nm

Wavefront Distortion:

< λ /4 @633nm


< 30″
AR-Coating: R < 0.2% @ 1064nm
Surface Quality: 10/5 to MIL-O-13830A
Transmission Tolerance: T ± 3%