Er:YLF crystals
Main features
- 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 examples
- 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)
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
Er3+:YLF crystals are characterized by a low phonon frequency, which decreases the probability of non-radiative multi-phonon relaxations, therefore increases the luminescence quantum efficiency. A long lifetime of laser emitting levels allow higher energy storage, which is useful for the Q-switch lasing regime. A high bandgap along with low phonon energy leads to a very wide transparency range, which is possibly from VUV to 10 µm region. Negative Er3+:YLF thermo-optic coefficient is an advantage since it reduces the thermal-lensing effect and improves beam shape as well as stability at high average pump power.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 972 nm |
| Absorption coefficient at a peak wavelength | 28 cm-1 |
| Absorption bandwidth at a peak wavelength | ~1 nm |
| Laser wavelength | 2810 nm |
| Lifetime of 4I11/2 erbium energy level | 4 ms |
| Emission cross-section @2800 nm | 1,5 × 10-20 cm2 |
| Refractive index @2070 nm | n0=1,442, ne=1,464 |
| Crystal structure | Tetragonal |
| Density | 3,95 g/cm3 |
| Mohs hardness | 5 |
| Thermal conductivity | ~5 Wm-1K-1 |
| dn/dT | -2 × 10-6 (//a) K-1, -4,1 × 10-6 (//c) K-1 |
| Thermal expansion coefficient | 8 × 10-6 K-1 |
| Typical doping level | 15 at.% |
| Er:YLF crystals | |
|---|---|
| Orientation | a-cut |
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <10 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/10@632,8 nm |
| Coatings | Uncoated, coatings available upon request |
| Mount | Unmounted |
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