Yb:YAG Laser Crystal
Ytterbium-doped yttrium aluminum garnet(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 Nd:YAG crystal, 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
1 ) Very low fractional heating, less than 11%
2 ) Very high slope deficiency
3 ) Broad absorption bands, about 8nm@940nm
4 ) No excited-state absorption or up-conversion
5 ) Conveniently pumped by reliable in GaAs diodes
6 ) High thermal conductivity@ 940nm (or 970nm)
7 ) High optical quality
Specifications
Material | Yb:YAG |
Yb-Dopant Concentration | 0.5%–25at% |
Orientation | <111> or <100> |
Dimensions | Diameter:2mm-50mm, Length:5-180mm(Upon customer’s request) |
Clear Aperture | Central 95% |
Extinction Ratio | >30dB (depends on actual size) |
Diameter Tolerance | +0/-0.04mm |
Length Tolerance | +0.5/-0mm |
Flatness | <λ/10@632.8nm |
Damage Threshold | >700MW/cm2 @10ns 10HZ |
Barrel Finish | Ground Finish 400#Grit |
Scratch/Dig | 10-5@MIL-0-13830A |
Parallelism | <10 arc seconds |
Perpendicularity | <5 arc minutes |
Wavefront Distortion | λ/8 per inch @632.8nm |
Anti-Reflection Coating | R<0.2%@1030nm per surface |
Properties
Laser Transition | 2F5/2 →2F7/2 |
Laser Wavelength | 1030nm |
Photon Energy | 1.93*10ˉ19 J@1030nm |
Emission Linewidth | 9nm |
Fluorescence Lifetime | 1.2ms |
Diode Pump Band | 940nm or 970nm |
Pump Absorption Band Width | 8nm |
Index of Refraction | 1.82@1030nm |
Loss Coefficient | 0.003 cm-1 |