Yb:YAG
YbYAG crystal is more suitable for diode-pumping than the traditional Nd-doped systems. It can be pumped at 0.94 μm laser output. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-state lifetime, three to four times lower thermal loading per unit pump power. Yb:YAG crystal is expected to replace Nd:YAG crystal for high power diode-pumped lasers and other potential applications.
Technical parameters of Yb:YAG
Doping(atm%): | 1.0% ~ 20% |
Orientation: | <111> crystalline direction |
Wavefront Distortion: | λ/10 per inch @ 632.8 nm |
Dimension Tolerances： | rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm |
Surface Quality: | 10/5 Scratch/Dig MIL-O-1380A |
Parallelism: | < 10″ |
Perpendicularity: | < 5′ |
Clear Aperture: | > 90% |
Surface Flatness: | < λ/10 @ 632.8 nm |
Chamfer: | < 0.1 mm @ 45o |
Barrel Finish | 50-80 micro-inch (RMS) , |
Size | Upon customer request |
Coating | AR/HR/PR coating upon customer’s request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
Quality Warranty Period | One year under proper use |
Slabs, thread rod, Er:YAG, Yb:YAG,Cr:YAG, Ce:YAG, Tm:YAG, Ho:YAG and other ion doped YAG crystals are also available upon request.
Optical properties of Nd:YAG
Laser Transition | 2 F 5/2→2 F 7/2 |
Laser Wavelength | 1030nm |
Photon Energy | 1.93×10-19 J(@1030nm) |
Emission Linewidth | 9nm |
Emission Cross Section | 2.0×10-20 cm2 |
Fluorescence Lifetime | 1.2ms |
Diode Pump Band | 940nm or 970nm |
Pump Absorption Band Width | 8nm |
Index of Refraction | 1.82 |
Thermal Optical Coefficient | 9×10-6/℃ |
Loss Coefficient | 0.003 cm-1 |
