Yb:YAG Laser Crystal
Yb:YAG (Ytterbium Doped Yttrium Aluminum Garnet) is very important in the design of diode-pumped lasers and optical applications.
This excellent crystal has low fractional heat loading, high conversion efficiency, broad absorption bandwidth, excitable with reliable InGaAs diodes, high thermal conductivity and large mechanical strength, and high optical quality.
Yb:YAG crystals are widely used in fields such as laser processing, optical communication, life sciences, medical, physics, and sensing.
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: 5～15 at% |
|---|---|
| Wavefront Distortion | ≤0.125 λ/inch |
| Extinction Ratio | ≥28 dB |
| Rod Sizes | Diameter:2～20 mm, Length:5～150 mm 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-PRF-13830B) |
| Chamfer | 0.006" ±0.002" at 45°±5° |
| AR Coating Reflectivity | ≤0.25% (@1030 nm) |
| Single pass loss | <3 × 103 cm-1 |
Optical and Spectral Properties of Yb:YAG Crystal
| Laser Transition | 2F5/2→2F7/2 |
|---|---|
| Laser Wavelength | 1030 nm |
| Photon Energy | 1.93 × 10-19J (@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 |