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Item: YAG-013
Item: YAG-013
Product Name: 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 crsytal , 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 is expected to replace Nd:YAG crystal for high power diode-pumped lasers and other potential applications.
Advantages of Yb:YAG Crystals
- 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: 0.5~25 at% |
| Orientation | [100] or[111]within 5° |
| 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-O-13830A) |
| Chamfer | 0.006"±0.002" |
| AR Coating Reflectivity | ≤ 0.25% (@1030nm) |
| Single pass loss | <3×10-3cm-1 |
Optical and Spectral Properties of Yb:YAG Crystals
| 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/oC |
| Loss Coefficient | 0.003 cm-1 |
Physical and Chemical Properties
| Crystal Structure | Cubic |
| Lattice Parameters | 12.01 Å |
| Melting Point | 1970oC |
| Moh Hardness | 8.5 |
| Density | 4.56±0.04g/cm3 |
| Specific Heat (0-20) | 0.59J/g.cm3 |
| Modulus of Elasticity | 310GPa |
| Young's Modulus | 3.17×104Kg/mm2 |
| Poisson Ratio | 0.3(est.) |
| Tensile Strength | 0.13~0.26GPa |
| Thermal Expansion Coefficient | [100]Direction:8.2×10-6/oC(0~250oC) |
| [110]Direction:7.7×10-6/oC(0~250oC) | |
| [111]Direction:7.8×10-6/oC(0~250oC) | |
| Thermal Conductivity | 14W/m/K(@20oC) |
| 10.5W/m/K(@100oC) | |
| Thermal Optical Coefficient (dn/dT) | 7.3×10-6/oC |
| Thermal Shock Resistance | 790W/m |
| Solubility | Water: Insoluble; Common Acids: Slightly |