Yb:YAG レーザ結晶
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 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. Yb:YAG crystal at 1030nm is a good substitute for a Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser(with a large volume), which emit at 514nm.
Advantages of Yb:YAG Crystals
- Very low fractional heating, less than11%
- Very high slope efficiency
- Broad absorption bands, about 8nm@940nm
- No excited-state absorption or up-conversion
- Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm)
- High thermal conductivity and large mechanical strength * High optical quality
Material and Specifications
| Dopant concentration | Yb: 5～15 at% |
| Wavefront Distortion | ≤ 0.125λ/inch |
| Extinction Ratio | ≥28 dB |
| Rod Sizes | Diameter:2～20mm,Length:5～150mm Upon request of customer |
| Dimensional Tolerances | Diameter:+0.00"/-0.002"mm, Length: ± 0.02" |
| Barrel Finish | Ground Finish: 400# Grit |
| Parallelism | ≤10" |
| Perpendicularity | ≤5′ |
| Flatness | λ/10 |
| Surface Quality | 10/5(MIL-PRF-13830B) |
| Chamfer | 0.006"±0.002" at 45°± 5° |
| AR Coating Reflectivity | ≤ 0.25% (@1030nm) |
| Single pass loss | <3×103cm-1 |
Optical and Spectral Properties of Yb:YAG Crystal
| Laser Transition | 2F5/2→2F7/2 |
| Laser Wavelength | 1030nm |
| Photon Energy | 1.93×10-19J(@1030nm) |
| Emission Linewidth | 9nm |
| Emission Cross Section | 2.0×10-20cm2 |
| Fluorescence Lifetime | 1.2 ms |
| Diode Pump Band | 940nm or 970nm |
| Pump Absorption Band Width | 8 nm |
| Index of Refraction | 1.82 |
| Thermal Optical Coefficient | 9×10-6/℃ |
| Loss Coefficient | 0.003 cm-1 |
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