metrolux Optische Messtechnik GmbH

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 (>500 MW/cm2),it will replace traditional materials,such as,LiF,organic Dye and color centers for passive Q-switching online_ordering.
Capabilities:
1) Cr 4+ dopant concentration:0.5 mol% ~ 3 mol%
2) Aperture:2x2 ~ 14x14mm
3) Length:0.1 ~ 12mm
4) Initial transmission:10% ~ 99%
coating 11-1

Typical Specification and Tolerance:
1) Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
2) Flatness:<λ/8 @ 633nm
3) Scratch/Dig code: better than 10/5 Scracth/dig per MIL-O-13830A
4) Parallelism:< 20 arc seconds
5) Perpendicularity:<5 arc minutes
6) Wavefront distortion:less than λ/8 @ 633nm
7) Clear aperture:> 90% central area
8)Coating:Anti-reflective
Notes:
To inquiry or order a finished Cr4+ crystals, please specify the specification listed above in particular the size, initial transmission and coatings.
Physical and Optical Properties
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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