Description:
Yb:YAG crystals (Ytterbium Doped Yttrium Aluminum Garnet)
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.
Optical and spectral properties of YbYAG
| 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 |
HGO offers YbYAG specifications:
| Doping(atm%): | 0.5% ~ 20% |
| Rod Sizes | Diameter: 2~20 mm, Length: 5~150 mm
Upon request of customer |
| Wavefront Distortion: | λ/8 per inch @ 632.8 nm |
| Dimension Tolerances： | Diameter: ±0.1mm
Length: ±0.5 mm |
| Surface Quality: | 10/5 Scratch/Dig MIL-PRF-1380A |
| Parallelism: | < 20″ |
| Perpendicularity: | < 15′ |
| Clear Aperture: | > 90% |
| Surface Flatness: | < λ/8 @ 632.8 nm |
| Chamfer: | < 0.2mm @ 45o |
| Barrel Finish | 50-80 micro-inch (RMS) , |
| Size | Upon customer request |
| Coating | AR/HR/PR coating upon customer’s request |
| Damage Threshold | AR-1030/940 nm, R < 0.2% @1030 nm, R < 0.5% @940 nm.
Other coatings are available upon request. |
| Quality Warranty Period | One year under proper use |
