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Yb:YAG is an important diode-pumped laser crystal, which is more suitable for diode pumping than traditional Nd-doped laser materials. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a wider diode pump absorption bandwidth
Product Description
Yb:YAG is an important diode-pumped laser crystal, which is more suitable for diode pumping than traditional Nd-doped laser materials. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a wider diode pump absorption bandwidth, which can effectively reduce the thermal management requirements of laser diodes. At the same time, the Yb ion laser has a long upper-level fluorescence lifetime, no excited state absorption and energy up-conversion, no radiation heat loss, and the heat load generated per unit pump power is 3 to 4 times lower than that of Nd:YAG crystals. Excellent crystal for average power solid-state lasers.
Main Features
high slope efficiency
High optical quality , thermal conductivity and mechanical strength
No excited state absorption and upconversion
The heat load generated by unit pump power is lower than that of Nd:YAG crystal
Diode pump absorption bandwidth is about 8nm@940nm
Suitable for common high power InGaAs laser diode (wavelength 940nm or 970nm) pumping
Material Properties
| Lattice constant | a = 0.518 nm , b = 0.532 nm c = 0.736 nm |
| Melting point | 1870 °C |
| Density | 5.35 g/ cm3 |
| Moh's hardness | 8.5 |
| Specific heat capacity | 400 J/(kg ·K) |
| Thermal conductivity | 11W/(m·K) |
| Coefficient of thermal expansion | a-axis: 9.5x 10 -6 /K ; b-axis: 4.2 x 10 -6 /K ; c-axis: 10.8x 10 -6 /K |
| Refractive index | na=1.91 , nb=1.92 , nc=1.94 |
| Thermo-optic coefficient | dn a /dT=9.7 x 10 -6 /K ; dn c /dT=14.5 x 10 -6 /K |
Product Parameters
| Doping concentration | Tm: 0.2~15at% |
| Orientation | [010] or [100] ±5° |
| Crystal size | Diameter 2~10mm, length 2~100mm , can be customized |
| Wavefront distortion | ≤0.125l/25mm @632.8nm |
| Extinction Ratio | ≥25dB |
| Dimensional tolerance | Diameter: +0.00/-0.04, length ±0.5mm |
| Cylindrical processing | Grinding or Polishing |
| Parallelism of end faces | ≤10" |
| Perpendicularity between end face and rod axis | ≤5′ |
| Flatness of end face | l/8 @632.8nm |
| Surface finish | 10/5 (MIL-O-13830A) |
| Chamfer | 0.15±0.05mm |
| AR Coating Reflectance | ≤0.25% |
