Er3+:YLF crystals are characterized by low phonon frequency, which decreases the probability of non-radiative multi-phonon relaxations, therefore increases luminescence quantum efficiency. Long lifetime of laser emitting levels allow higher energy storage, which is useful for the Q-switch lasing regime. High band-gap along with low phonon energy determines very wide transparency range, which is possibly from VUV to 10μm region. Negative Er3+:YLF thermo-optic coefficient is an advantage, since it reduces thermal-lensing effect and improves beam shape as well as stability at high average pump power.
Parameter
| Orientation | A-cut |
| Parallelism | <10〞 |
| Perpendicularity | <10ˊ |
| Surface Quality | 10-5 S-D |
| Wavefront Distortion | <λ/4 per inch@632.8 nm |
| Surface Flatness | <λ/10 @632.8 nm |
| Clear Aperture | >90% |
| Face Dimensions Tolerance | +0.0/-0.1 mm |
| Length Tolerance | ±0.1mm |
| Chamfer | <0.1mm@45° |
| Structure Symmetry | Tetragonal |
| Lattice Constants | a=5.173, c=10.747 Å@1.5% |
| Specific mass | 3.95g/cm3 |
| Melting Point | 819°C |
| Thermal Conductivity /(W·m-1·K-1) | ～5 |
| Specific Heat(J·g-1·K-1) | 0.79 |
| Thermal Expansion /（10-6·K-1 ） | 8 |
| Hardness (kg/mm2@Mohs) | 5 |
| Young`s Modulus /(108g/cm2) | 7.65 |
| Typical Doping Level | 15@.% |
| Refractive Index (@2070nm) | no=1.442, ne=1.464 |
| Thermo-optic Coefficient（10-6·K-1） | -2(∥a), -4.1(∥c) |
| Lifetime of 4I11/2 Erbium Energy Level(ms) | 4 |
| Emission Cross Section(10-20/cm2) | 1.5@2800nm |
| Absorption Peak Wavelength | 972nm |
| Absorption Coefficient at Peak Wavelength | 28cm-1 |
| Absorption Bandwidth at Peak Wavelength | ～1nm |
| Laser Wavelength | 2810nm |
Feature
- A low phonon frequency
- Long lifetimes of the laser emitting levels
- Wide transparency range (from the VUV to the 10 μm region)
- Negative thermo-optic coefficient
- Custom crystals available upon request
Application
- CW and Q-switched ~3 μm lasers for oral surgery, dentistry, implant dentistry, and otolaryngology
- Up-conversion visible lasers for display technology, medicine (diagnosis and treatment)
Literature
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