Ce:LiSAF
Lithium strontium hexafluoroaluminate (LiSrAlF6, LiSAF) are excellent host materials for tunable all-solid-state lasers in the UV region when doped with trivalent cerium(Ce:LiSAF).The gain spectra of Ce:LiSAF is in the range 280-320 nm and is characteristic of the Ce3+ 5d1–4f1 interconfigurational transition. Ce:LiSAF is attractive UV solid-state laser materials with the central emission wavelength at 290 nm and a practical tuning range from 288 to 315 nm. The slope efficiencies of Ce:LiSAF has been reported to reach as high as 29%. The broad gain-bandwidth of this fluoride crystals in the UV region has made it appealing for ultrashort-pulse generation and amplification. It can also be pumped by the fourth harmonic of a Nd:YAG laser. Ce:LiSAF is the preferred material of the colquiriite hosts, since it shows higher gains than Ce:LiCAF.
Parameter
| Orientation Tolerance | 5ˊ |
| Parallelism | <10〞 |
| Perpendicularity | 5ˊ |
| Chamfer | 0.1mm@45° |
| Surface Quality | 10/5 or better |
| Wavefront Distortion | λ/8 @632.8 nm |
| Surface Flatness | λ/10 @632.8 nm |
| Clear Aperture | >95% |
| Diameter Tolerance | +0/-0.05mm |
| Length Tolerance | ±0.1mm |
| Coatings | As per requirement |
| Dopant Concentration Tolerance | 0.10% |
| Crystal Structure | Trigonal |
| Space Group | P31C |
| Lattice Constants | a=5.08, c=10.15Å@1mol%CeF3 |
| Density (g/cm3) | 3.45 |
| Melting Point | 766°C |
| Thermal Conductivity(W·m-1·K-1) | 3.1 |
| Thermal Expansion(10-6K-1) | 21.6(∥a),-6.7(∥c) |
| Absorption Cross-section(10-18cm2)@266nm | 7.3(π), 6.6(σ) |
| Absorption Coefficient@266nm | 7cm-1 |
| Refractive Index | n=1.42 |
| Peak Lasing Wavelength(nm) | 290 |
| Fluorescence Lifetime(ns) | 28 |
| Emission Cross-section(10-18cm2)@290nm | 9.5(π), 6.1(σ) |
| Laser Threshold(μJ) | 15-25 |
| Laser Slope Efficiency | 29% |
| Estimated Pumping Efficiency | 50(π), 20(σ) |
| ESA Cross-section(10-18cm2)@266nm | 6.5π), 23(σ) |
| Gain Cross-section(10-18cm2)@290nm | 6.8(π), 1.5(σ) |
| Saturation Fluence(mJ/cm2) | 100 |
| λ(μm) | n | λ(μm) | n | λ(μm) | n |
| 0.18 | 1.51 | 0.32 | 1.45 | 5.82 | 1.39 |
| 0.19 | 1.50 | 0.43 | 1.44 | 6.20 | 1.38 |
| 0.21 | 1.49 | 0.88 | 1.43 | 6.71 | 1.37 |
| 0.22 | 1.48 | 2.67 | 1.42 | 7.00 | 1.36 |
| 0.24 | 1.47 | 3.94 | 1.41 | 7.53 | 1.35 |
| 0.27 | 1.46 | 5.01 | 1.40 | 8.22 | 1.34 |
Feature
- large band gaps and low phonon energies
- Characteristic of the Ce3+5d1–4f1 interconfigurational transition
- High fluorescence efficiencies
- Small non-linear refractive indices
- Can be pumped by the fourth harmonic of a Nd:YAG laser
- Transparency, tolerance to laser-induced damage
- Broad UVtunability (from 280 to 325 nm)
Application
- Scintillator
- Tunable ultraviolet lasers
- Remote-sending applications
- Ultrafast pulse generation and amplification
- Power UV laser amplifiers
Literature
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