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Cr4+:YAG Crystal (Chromium doped yttrium aluminum garnet)

Crystals >>> Passive Q Swith Crystal >>>  Cr4+:YAG Crystal

Chromium doped yttrium aluminum garnet or Cr4+:YAG has higher damage threshold and is mostly used in passively Q-switching diode pumped or lamp pumped passive Q-switching materials.  Its main advantages are high damage threshold, and absorptions wavelength of 900nm--1200nm, and peak of around 1060nm with large absorption section.  

New Rise Optics supplies a wide variety of finished crystals.  Our general production of Cr4+:YAG follows:

Main Specifications  
Cr4+ dopant concentration: 0.5 mol% ~ 3 mol%
Aperture: 2x2 ~ 14x14mm
Length: 0.1 ~ 12mm
Initial transmission: 10% ~ 99%
Coating: Antireflective
Angle tolerance: Δθ< � 0.5�; Δφ< �0.5�
Dimension tolerance: (W � 0.1mm) x (H � 0.1mm) x (L + 0.2mm/-0.1mm)
Flatness: λ/8 @ 633nm
Scratch/Dig code: 10/5 Scracth/dig per MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 5 arc minutes
Wavefront distortion: less than λ/8 @ 633nm
Clear aperture: > 90% central area

To inquire or order a finished Cr4+ crystals, please provide specification as  listed above, particularly the size, initial transmission and coatings.

Physical Properties  
Chemical Formula Cr4+:Y3A15O12
Crystal Structure Cubic garnet
Recovery time 8.5μs
Hardness  8.5 Mohs
Density 4.56g/cm
Orientation [100]+/-10�
Thermal conductivity 12.13w/m/kv
Refractive index 1.82 @ 1064nm
Optical Properties
Base state absorption cross section σs1=4.3x10-18cm2
Emission state absorption cross section σs2=8.2x10-19cm2
Fluorescence lifetime 3.4us





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