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:
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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