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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.

 

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

 

HG offer 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.

 

Cr:YAG crystals with various ion doped YAG diffusion bonded are also available from HG Optronics.,Inc.. Please visit here