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Yb:YAG
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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