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Yb:YAG - Ytterbium Doped Yttrium Aluminum Garnet
- Yb:YAG is an important laser-active material. Compared with Nd:YAG, Yb:YAG has a much larger absorption, a longer upper-laser level lifetime, 3 to 4 times lower thermal loading per unit pump power.
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Introduction
Ytterbium Doped Yttrium Aluminum Garnet (Yb:Y3Al5O12, 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 1030 nm is a good substitute for a Nd: YAG crystal at 1064 nm and its second harmonic at 515 nm may replace Ar-ion laser (with a large volume), which emit at 514 nm.
CASTECH's Yb:YAG Crystal is featured by
• 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 940 nm(or 970 nm)
• High thermal conductivity and large mechanical strength
• High optical quality
Table 1. Optical and Spectral Properties of Yb: YAG Crystal
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Laser Transition |
2F5/2→2F7/2 |
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Laser Wavelength |
1030 nm |
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Photon Energy |
1.93 × 10-19 J (@1030 nm) |
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Emission Linewidth |
9 nm |
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Emission Cross Section |
2.0 × 10-20 cm2 |
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Fluorescence Lifetime |
1.2 ms |
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Diode Pump Band |
940 nm or 970 nm |
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Pump Absorption Band Width |
8 nm |
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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 |
Specifications of Yb: YAG crystal from CASTECH
Table 2. Material and Specifications
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Dopant Concentration |
Yb: 5~15 at% |
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Rod Sizes |
Diameter: 2~20 mm, Length: 5~150 mm Upon request of customer |
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Dimensional Tolerances |
Diameter: ±0.1mm Length: ±0.5 mm |
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Surface Quality |
10/5 to MIL-PRF-13830B |
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Wavefront Distortion |
< λ/8 @633 nm |
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Flatness |
λ/8 @633 nm |
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Parallelism |
20 arc sec |
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Perpendicularity |
≦ 15 arc min |
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Extinction Ratio |
≧ 28 dB |
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Barrel Finish |
Ground Finish: 400＃Grit |
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Chamfer |
≦ 0.2 mm × 45° |
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AR Coating Reflectivity |
AR-1030/940 nm, R < 0.2% @1030 nm, R < 0.5% @940 nm. Other coatings are available upon request. |
|
Single Pass Loss |
< 3 × 10-3 cm-1 |
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Laser Crystals_Yb_YAG.pdf
Size:2020-11-19 10:58:08
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