Cr YAG Crystal

• High power laser pulses without electro-optic Q-switches

• Good thermal conductivity

• High damage threshold

• Pricision control in Transmittance


Cr4+:YAG Crystal is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO4 or other Nd and Yb doped lasers at wavelength from 0.8 to 1.2 µm. Because of its chemical stability, durability, UV resistance, good thermal conductivity and high damage threshold (> 500 MW/cm2) and easy machining, it is replacing traditional materials, such as LiF, organic Dye and color centers.

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=4.3×10-18cm2
Emission state absorption cross section σs2=8.2×10-19cm2
Fluorescence lifetime 3.4us

Specification of CrYAG

Main Specifications
Cr4+ dopant concentration: 0.5 mol% ~ 3 mol%
Aperture: 2×2 ~ 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-13830B
Parallelism: better than 20 arc seconds
Perpendicularity: 5 arc minutes
Wavefront distortion: less than λ/8 @ 633nm
Clear aperture: > 90% central area