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Cr4+:YAG

Passive Crystals--------- Cr4+ :YAG

Passive Q-Switching has advantages of passive (no necessary for the input power),compact,low

cost and easy to manufacture and operate.Cr4+:YAG is an excellent passive Q-switch crystals

for Nd and Yb doped laser whose wavelength is in the range of 900-1200 nm,especially for the

diode pumped or lamp pumped Nd:YAG,Nd:YLF and Yb:YAG. Due to Cr4+:YAG has chemically

stable,durable,UV resistant,good thermal conductivity and high damage threshold, it will

replace traditional materials.

DeLn Optics general Cr4+:YAG production capabilities include:

Cr 4+ dopant concentration 0.5 mol% ~ 3 mol%

Aperture 2x2 ~ 14x14mm

Length:0.1 ~ 12mm 0.1 ~ 12mm

Initial transmission 10% ~ 99%

Dimension tolerance (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

Flatness <λ/8 @ 633nm

Scratch/Dig code better than 10/5 Scracth/dig per MIL-O-13830A

Parallelism < 20 arc seconds

Perpendicularity <5 arc minutes

Wavefront distortion less than λ/8 @ 633nm

Clear aperture > 90% central area

Coating Anti-reflective

Chemical Formula Cr 4+ :Y 3 A 15 O 12

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 σs 1 =4.3x10 -18 cm 2

Emission state absorption cross section σs 2 =8.2x10 -19 cm 2

Fluorescence lifetime 3.4us

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