pk10开奖记录 Yb:YAG
pk10开奖记录 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 Crystal：
• Very low fractional heating, less than 11%;
• 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.
Table 1. 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 | ＜3×10-3 cm-1 |
Table 2. Optical and Spectral Properties of Yb:YAG Crystal
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 |
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