Cr, Tm, Ho: YAG is high efficient laser crystal pumped by Xenon lamp or diode with wavelength of 2.1μm. the pump source main originates from the flashlamp energy absorbed by Cr3+, Ho3+ is working ion and Tm3+ acts as intermediary to transfer energy. 2.1 μm laser wave can be absorbed by water very well, transmits atmosphere easily and is safe to eye. Therefore, it is widely used in medical treatment, laser radar, military and so on. What’s more 2.1 μm laser is ideal pump source for 3-5 μm mid-infrared optical parametric oscillator.
Physical and Chemical Properties
| Structure | Cubic |
| Lattice Constant | 12.01Å |
| Melting Point | 1970°C |
| Density | 4.56g/cm3 |
| Orientation | <111> or <100]> crystalline within 5° |
| Thermal Expansion | 7.8×10-6 /K |
| Thermal Conductivity | 14W/m/K, 20°C；10.5W/m/K, 100°C |
| Mohs Hardness | 8.5 |
| Dielectric Constant | 11.7 |
Optical and Spectral Properties
| Laser Transition | 5I7 → 5I8 |
| Laser Wavelength | 2.094 µm |
| Photon Energy | 9.55 x 10-20 J |
| Emission Cross Section | 7 x 10-21 cm2 |
| Fluorescence Lifetime | 8.5 ms |
| Index of Refraction | 1.80 @2.08 µm |
| Aperture | >90% |
| Absorption Linewidth | 4 nm |
| Diode Pump Band | 781 nm |
| Major Pump Band | 400~800 nm |
Absorption and Emission Spectrum
Material and Specifications
| Doped Concentration | Ho:0.3~0.4at% Cr:0.3~1.2at% Tm:5~6at% |
| Wavefront Distortion | <λ/4@632nm |
| Extinction Ratio | ≥25 dB |
| Rod Sizes | Diameter:3~6mm,Length:50~120mm |
| Dimensional Tolerances | Diameter:+0.00/-0.05mm, Length: ± 0.5mm |
| Barrel Finish | 50-80 micro-inch (RMS) |
| Parallelism | ≤30″ |
| Perpendicularity | ≤5′ |
| Flatness | λ/10@ 633 nm |
| Surface Quality | 10/5 Scratch / Digper MIL-O-1380A |
| Chamfer | 0.006″±0.002″ at 45°± 5° |
| AR Coating Reflectivity | ≤ 0.25% (@2094nm) |
Wide absorption band
Working at room temperature
2.1 mm lasing wavelength is for eye
High slope efficiency
Can be pumped by flash lamp or diode
Medical Applications
Laser medicine
Military
Laser radar