CRYLIGHT 社製 Passive Crystals


Cr4+:YAG Crystal




 Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight. Cr 4+ :YAG (Y3Al5O12) is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Yb:YAG or other Nd and Yb doped lasers at wavelength from 1.0 to 1.2 mm. Because of its chemically stable, durable, UV resistant, good thermal conductivity and high damage threshold (> 500 MW/cm2) and being easy to be operated, it will replace traditional materials, such as, LiF, organic Dye and color centers.

Advantages of Cr 4+ :YAG Crystals 

Providing high power laser pulses without electro-optic Q-switches
More robust and stable than dyes or color centers
High damage threshold




Cr4+ dopant: 0.5 mol% ~ 3 mol%
Aperture: 2×2 ~ 14x14mm
Length: 0.1 ~ 12mm
Initial Ttransmission 10% ~ 99%



Orientation: <111> or <100> within 5°
Dimensional Tolerance: +/-0.1mm
Flatness: <λ/8 at 633nm
Surface Quality: 20/10 Scracth/Dig
Parallelism: < 20 arc seconds
Perpendicularity: < 5 arc minutes
Wavefront Distortion: <λ/8 at 633nm
Clear Aperture: Central 90%
Chamfer: 0.15×45°
Coating: * S1,S2: AR@1064nm
* S1: HR@1064nm; S2: AR@1064nm


Chemical Formula Cr4+:Y3A15O12
Crystal Structure Cubic garnet
Recovery time 8.5μs
Hardness Mohs 8.5
Density 4.56g/cm
Orientation [100]+/-10°
Thermal conductivity 12.13w/m/k
Refractive index 1.82 @ 1064nm


Base state absorption cross section σs1=4.3×10-18cm2
Emission state absorption cross section σs2=8.2×10-19cm2
Fluorescence lifetime 3.4us

*When ordering Cr4+:YAG crystal, please specify the aperture, initial transmission(To) and coatings.