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.
Advantages of Yb:YAG Crystal
- Very low fractional heating, less than11%
- 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
Material and Specifications
Dopant concentration |
Yb: 5¡«15 at% |
Wavefront Distortion |
¡Ü 0.125¦Ë/inch |
Extinction Ratio |
¡Ý28 dB |
Rod Sizes |
Diameter:2¡«20mm,Length:5¡«150mm Upon request of customer |
Dimensional Tolerances |
Diameter:+0.00"/-0.002"mm, Length: ¡À 0.02" |
Barrel Finish |
Ground Finish: 400# Grit |
Parallelism |
¡Ü10" |
Perpendicularity |
¡Ü5¡ä |
Flatness |
¦Ë/10 |
Surface Quality |
10/5(MIL-PRF-13830B) |
Chamfer |
0.006"¡À0.002" at 45¡ã¡À 5¡ã |
AR Coating Reflectivity |
¡Ü 0.25% (@1030nm) |
Single pass loss |
<3¡Á103cm-1 |
Optical and Spectral Properties of Yb:YAG Crystal
Laser Transition |
2F5/2¡ú2F7/2 |
Laser Wavelength |
1030nm |
Photon Energy |
1.93¡Á10-19J(@1030nm) |
Emission Linewidth |
9nm |
Emission Cross Section |
2.0¡Á10-20cm2 |
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¡Á10-6/¡æ |
Loss Coefficient |
0.003 cm-1 | |