Laser Crystals: Cr4+:YAG

Cr4+:YAG (Y3Al5O12) (Chromium Doped Yttrium Aluminum Garnet ) 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 (better than 500 MW/cm2). Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight.

Basic Properties

Chemical Formula Cr4+:Y3Al5O12
Crystal Structure Cubic garnet
Recovery time 8.5 μs
Hardness 8.5 Mohs
Density 4.56 g/cm3
Thermal conductivity 12.13 W/m/K
Refractive index 1.82 @ 1064nm
Ground state absorption cross section σs1=4.3×10-18cm2
Excited state absorption cross section σs2=8.2×10-19cm2
Fluorescence lifetime 3.4 μs


We offer Cr:YAG Specifications

Orientation: The rod axis is along [100] within5°,[111] and  [110] within5°
Cr4+ concentration: 0.5 mol% ~ 3 mol%
Aperture 2×2 ~ 20×20 mm
Length: 0.1 ~ 12 mm
Initial transmission: 5% ~ 99%
Angle tolerance: Δθ< ± 0.5°; Δφ< ±0.5°
Flatness: λ /8 @ 633 nm
Parallelism: 20 arc sec
Perpendicularity: 5 arc minutes
Surface finishing: 20/10 scratch/dig to MIL-O-13830A
Wavefront distortion: less than λ/8 @ 633 nm
Coating AR/HR/PR coating upon customer’s request

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

Cr:YAG crystals with various ion doped YAG diffusion bonded are also available from us.


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