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Passive Q-Switch V:YAG Crystal
Cr4+:YAG Crystal
Co2+:MgAl2O4 crystals

Cr4+:YAG Crystal

Cr4+:YAG Crystal

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

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=4.3x10-18cm2
Excited state absorption cross section σs2=8.2x10-19cm2
Fluorescence lifetime 3.4 μs
 

Cr:YAG Specifications 

Orientation:     The rod axis is along [100] within5°,[111] and  [110] within5°
Cr4+ concentration:     0.5 mol% ~ 3 mol%
Aperture 2x2 ~ 20x20 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. 

Eydia

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