Ho:Cr:Tm:YAG Laser Crystal
The Ho:Cr:Tm:YAG crystal is a high-efficiency laser crystal that oscillates at 2.1 µm and is used in a wide range of applications such as surgery, dentistry, and atmospheric testing.
It has a high slope efficiency, operates well at room temperature, and operates within a relatively eye-safe wavelength range.
Advantages of Ho:Cr:Tm:YAG Crystal
- High slope efficiency
- Pumped by lamp or diode
- Operates well at room temperature
- Operates in a relatively eye-safe wavelength range
Optical and Spectral Properties
| Laser Transition | 5I7 - 5I8 |
|---|---|
| Laser Wavelength | 2.097 µm |
| Photon Energy | 9.55 × 10-20 J |
| Emission Cross Section | 7 × 10-21 cm2 |
| Fluorescence Lifetime | 8.5 ms |
| Index of Refraction | 1.80 @2.08 µm |
| Absorption Linewidth | 4 nm |
| Diode Pump Band | 781 nm |
| Major Pump Bands | 400～800 nm |
Specifications of Ho:Cr:Tm:YAG crystal from CHEMI
| Dopant Concentration | Ho:～0.35 at %, Tm:～5.8 at%, Cr:～1.5at % |
|---|---|
| Wavefront Distortion | ≤0.125 λ/inch (@1064 nm) |
| Extinction Ratio | ≥25 dB |
| Rod Sizes | Diameter:3～6 mm, Length:50～120 mm Upon request of customer |
| Dimensional Tolerances | Diameter: +0.00/-0.05 mm, Length: ± 0.5 mm |
| Barrel Finish | Ground Finish: 400# Grit |
| Parallelism | ≤30" |
| Perpendicularity | ≤5′ |
| Flatness | λ/10 |
| Surface Quality | 10/5 |
| Chamfer | 0.006"±0.002" at 45°± 5° |
| AR Coating Reflectivity | ≤ 0.25 % (@2094 nm) |