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Yb:YAG
- 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.
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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
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Dopant concentration |
Yb: 5~15 at% |
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Wavefront Distortion |
≤ 0.125λ/inch |
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Extinction Ratio |
≥28 dB |
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Rod Sizes |
Diameter:2~20mm, Length:5~150mm Upon request of customer |
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Dimensional Tolerances |
Diameter:+0.00“/-0.002”mm, Length: ± 0.02" |
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Barrel Finish |
Ground Finish: 400# Grit |
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Parallelism |
≤10″ |
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Perpendicularity |
≤5′ |
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Flatness |
λ/10 |
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Surface Quality |
10/5 (MIL-PRF-13830B) |
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Chamfer |
0.006"±0.002" at 45°± 5° |
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AR Coating Reflectivity |
≤ 0.25% (@1030nm) |
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Single pass loss |
＜3×10-3 cm-1 |
Table 2. Optical and Spectral Properties of Yb:YAG Crystal
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Laser Transition |
2 F 5/2→2 F 7/2 |
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Laser Wavelength |
1030nm |
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Photon Energy |
1.93×10-19 J(@1030nm) |
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Emission Linewidth |
9nm |
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Emission Cross Section |
2.0×10-20 cm2 |
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Fluorescence Lifetime |
1.2ms |
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Diode Pump Band |
940nm or 970nm |
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Pump Absorption Band Width |
8nm |
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Index of Refraction |
1.82 |
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Thermal Optical Coefficient |
9×10-6/℃ |
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Loss Coefficient |
0.003 cm-1 |
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Laser Crystals_Yb_YAG.pdf
