Yb：YAG
Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems.Compared with the commonly used Nd:YAG crsytal,Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers,a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power.
Advantages of Cr4+:YAG Crystals
l Very low fractional heating,less than 11%
l Very high slope efficiency
l Broad absorption bands,about 8nm@940nm
l No excited-state absorption or up-conversion
l Conveniently pumped by reliable InGaAs diodes
l At 940nm(or970nm)High thermal conductivity
l High optical quality
Typical finished part specifications and tolerances are listed below:
l Rod sizes from 2mm to 50mm in diameter and from 5mm to180mm in length
l Yb dopant concentrations between 0.5 and 25at%
l Polished and AR coated
l Damage threshold of over 750MW/cm2
Specifications:
Material | Yb:YAG |
Diameter Tolerance | +0,-0.02mm |
Thickness Tolerance | +0.5,-0mm |
Parallelism | <10 arc seconds |
Perpendicularity | <5 arc minutes |
Chamfer | 0.1mm@45 |
Wavefront Distortion | <λ/8 per inch @632.8nm |
Extinction Ratio | >30dB |
Barrel Finish | Ground Finish400#Grit |
Flatness | <λ/10 @632.8nm |
Surface Quality | 10/5 |
Anti-Reflection Coating | R<0.20%@1030nm per surface |