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Yb:YAG - Ytterbium Doped Yttrium Aluminum Garnet
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 8 nm @940 nm
• 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
|
Laser Transition |
2F5/2→2F7/2 |
|
Laser Wavelength |
1030 nm |
|
Photon Energy |
1.93 × 10-19 J (@1030 nm) |
|
Emission Linewidth |
9 nm |
|
Emission Cross Section |
2.0 × 10-20 cm2 |
|
Fluorescence Lifetime |
1.2 ms |
|
Diode Pump Band |
940 nm or 970 nm |
|
Pump Absorption Band Width |
8 nm |
|
Index of Refraction |
1.82 |
|
Thermal Optical Coefficient |
9 × 10-6 /℃ |
|
Loss Coefficient |
0.003 cm-1 |
Specifications of Yb: YAG crystal from CASTECH
Table 2. Material and Specifications
|
Dopant Concentration |
Yb: 0.5~20 at% |
|
Rod Sizes |
Diameter: 2~20 mm, Length: 5~150 mm Upon request of customer |
|
Dimensional Tolerances |
Diameter: ±0.1mm Length: ±0.5 mm |
|
Surface Quality |
10/5 to MIL-PRF-13830B |
|
Wavefront Distortion |
< λ/8 @633 nm |
|
Flatness |
λ/8 @633 nm |
|
Parallelism |
20 arc sec |
|
Perpendicularity |
≦15 arc min |
|
Extinction Ratio |
≧28 dB |
|
Barrel Finish |
Ground Finish: 400＃Grit |
|
Chamfer |
≦0.2 mm × 45° |
|
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 |
Products
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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.
-
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 8 nm @940 nm
• 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
|
Laser Transition |
2F5/2→2F7/2 |
|
Laser Wavelength |
1030 nm |
|
Photon Energy |
1.93 × 10-19 J (@1030 nm) |
|
Emission Linewidth |
9 nm |
|
Emission Cross Section |
2.0 × 10-20 cm2 |
|
Fluorescence Lifetime |
1.2 ms |
|
Diode Pump Band |
940 nm or 970 nm |
|
Pump Absorption Band Width |
8 nm |
|
Index of Refraction |
1.82 |
|
Thermal Optical Coefficient |
9 × 10-6 /℃ |
|
Loss Coefficient |
0.003 cm-1 |
Specifications of Yb: YAG crystal from CASTECH
Table 2. Material and Specifications
|
Dopant Concentration |
Yb: 0.5~20 at% |
|
Rod Sizes |
Diameter: 2~20 mm, Length: 5~150 mm Upon request of customer |
|
Dimensional Tolerances |
Diameter: ±0.1mm Length: ±0.5 mm |
|
Surface Quality |
10/5 to MIL-PRF-13830B |
|
Wavefront Distortion |
< λ/8 @633 nm |
|
Flatness |
λ/8 @633 nm |
|
Parallelism |
20 arc sec |
|
Perpendicularity |
≦15 arc min |
|
Extinction Ratio |
≧28 dB |
|
Barrel Finish |
Ground Finish: 400＃Grit |
|
Chamfer |
≦0.2 mm × 45° |
|
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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