Cr4+:YAG (Y3Al5O12) is an ideal material for passive Q-switching of Nd:YAG and other Nd and Yb doped lasers in the wavelength range of 0.8 to 1.2 mm. One of the remarkable features of Cr4+:YAG is high damage threshold of 500-1000 MW/cm2. It is easy to be operated and therefore outstandingly suited to replace LiF and Dye which are commonly used for passive Q-switching. Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight.




Basic Properties



Cr4+ :Y3Al5O12

Crystal Structure

Cubic Garnet

Dopant Level

0.5 mol%  ~ 3 mol%

Thermal conductivity [W/m/K]



8.5 (Mohs)

Damage Threshold

> 500 MW/cm2

Refractive Index

1.82 @ 1064 nm


The preliminary experiments of 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.






Dimension Tolerance:          +/-0.2mm

Flatness:                            < 1/8 lambda @633nm

Wavefront Distortion:           <  1/4 lambda @633nm

Parallelism:                        < 30"

Surface quality:                 10/5 scratch/dig

AR-coating:                       R<0.2% @ 1064 nm



When ordering Cr4+:YAG crystal, please specify the aperture, initial transmission(To) and coatings.




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