Cr:YAG Crystals

Cr:YAG Crystals
Cr:YAG Crystals

Cr:YAG (Chromium doped Ytterium Aluminum Garnet, Cr:Y3Al5O12) crystal is an ideal material for passive Q-switching of Nd:YAG and other Nd or Yb doped lasers in the wavelength range of 0.8 to 1.2 μm. One of the remarkable features of Cr:YAG is its high damage threshold of 500-1000 MW/cm2. Its absorption band extends from 800 nm to 1200 nm and peaks at around 1060nm with a very large absorption cross section. Passive Q-switched lasers incorporating Cr:YAG crystals have been extensively manufactured at low cost and with reduced system size and weight.

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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 @ 1064 nm
Ground state absorption cross section σs1=4.3x10-18 cm2
Excited state absorption cross section σs2=8.2x10-19 cm2
Fluorescence lifetime 3.4 μs


Specifications of Cr:YAG components:

Orientation:    The rod axis is along <111> or <100>  
Cr4+ concentration:    0.5 mol% ~ 3 mol%
Aperture 2x2 ~ 14x14 mm  
Length: 0.1 ~ 12 mm
Initial transmission (T0):  5% ~ 99%
T0 tolerance:                +/- 2%
Flatness:   λ /10 @ 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


Anti-Reflection (AR) Coating:

AR coatings are available @ 1064 nm or other wavelengths. The typical reflectance is R < 0.20%  per surface.

Typical AR coating curve @ 1064 nm:


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