Crystals Materials
Ho:YLF Crystals for Remote Sensing and Pollutant Detection Applications
Ho:YLF crystal (Holmium-doped:YAG) is a very attractive laser material, because the lifetime of the upper laser level is much longer ( ~ 14 ms) than in Ho:YAG and the emission cross sections are higher. Additionally the thermal lens in Ho:YLF is much weaker, which helps to generate diffraction limited beams even under intense end-pumping.
| Material | Ho:LiYF4 |
|---|---|
| Diameter | 3 ~ 10 mm |
| Length | 5 ~ 120 mm |
| Doping | 0.2% ~ 3 atm% |
| Orientation | a-cut or c-cut |
| Dimension Tolerances | ±0.05 mm |
| Surface Quality | 10/5 S/D |
| Parallelism | < 10 arcsec |
| Perpendicularity | < 5 arcmin |
| Clear Aperture | > 90% |
| Wavefront Distortion | λ/10 @ 633 nm |
| Surface Flatness | < λ/10 @ 632.8 nm |
| Chamfer | < 0.1 mm @ 45° |
| Coating | AR/HR/PR coating upon customer's request |
| Chemical Formula | Ho3+:LiYF4 |
| Crystal Structure | Tetragonal |
| Lattice Constant | 12.01 Å |
| Density | 3.95 g/cm3 |
| Melting Point | 825 °C |
| Thermal Conductivity | 0.06 W/cm/K |
| Thermal Optical Coefficient (dn/dT) | 8 x 10-6/K |
| Hardness (Mohs) | 4 - 5 |
| Laser Transition | 5I7 → 5I8 |
| Absorption Cross Section | 1.2 x 10-20 cm2 |
| Emission Cross Section | 1.8 x 10-20 cm2 |
| Absorption Bandwidth at Peak Wavelength | ~18 nm |
| Absorption Peak Wavelength | 1940 nm |
| Laser Wavelength | 2060 nm |
| Lifetime of 5I7 Energy Level | 10 ms |
| Refractive Index @1.064 μm | no=1.448, ne=1.470 |
Stock specification list
If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
Anti-reflection coatings are available at your specified wavelength.
Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
To inquiry or order a finished Ho:YLF laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Ho-dopant concentration, sizes, and coating. For special request,
please specify specification in details for evaluation and fabrication.
| Part Number | Face size | Length | Doping, atm.% | Orientation | Coating |
|---|---|---|---|---|---|
| Ho-YLF-001 | Φ3.0 mm | 30.0 mm | 1.0 | a-cut | AR/AR@1900-2100 nm |
| Ho-YLF-002 | 5.0*5.0 mm | 2.0 mm | 1.0 | a-cut | AR/AR@1900-2100 nm |
| Ho-YLF-003 | Φ8.0 mm | 2.0 mm | 1.0 | a-cut | AR/AR@1900-2100 nm |
Documents Download