LiSAF
Lithium strontium hexafluoroaluminate(LiSAF) crystals are widely used as vacuum ultraviolet(VUV) and ultraviolet(UV) laser host media. It has excellent transmission characteristics down to the vacuum ultraviolet (VUV) region. The transmission edge of LiSAF was measured experimentally to be 116nm. LiSAF(LiSrAIF6) are excellent laser materials with high energy storage and high slope efficiency, also ideal working material under conditions of ultra short pulse and ultra high power. Like Ti:sapphire, LiSAF exhibits a broad bandwidth, tunable from 760 to 1000 nm. Unlike Ti:sapphire, however, it has a relatively long upper-state lifetime (60µs) and, therefore, can be flashlamp-pumped. This advantage, coupled with the fact that LiSAF has a low nonlinear refractive index and low thermal lensing, make it an ideal candidate for high-power short pulse laser systems.
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 |
| Damage Threshold | over 15J/cm2 TEM00, 10ns, 10Hz |
| Dopant Concentration Tolerance | 0.10% |
| Lattice | HexagonaL |
| Space Group | P31C |
| Lattice Constants | a=5.08, c=10.214Å |
| Density (g/cm3) | 3.45 |
| Melting Point | 750°C |
| Thermal Conductivity(W·m-1·K-1) | 3.09(∥a), 4.58(∥c) |
| Thermal Expansion(10-6·K-1) | -10(∥a), 18.8(∥c) |
| Specific Heat(J·g-1·K-1) | 0.842 |
| Fracture Toughness(MPa·m1/2) | 0.4 |
| Band Gap(eV)@LDA | 7.92(indirect) |
| Young’s Modulus(GPa) | 86.33(∥a), 83.45(∥c) |
| Bulk Modulus(GPa) | 83.75 |
| Dielectric Constant | 1.26 |
| Absorption Edge | 116nm |
| Refractive Index | no=1.3944, ne=1.3988@632,8nm |
| Thermal-optical Coefficient(10-6/°C) | -4.5(no), -9.1(ne) |
| Wavelength(nm) | no | ne |
| 632.8 | 1.3944 | 1.3988 |
| 546.1 | 1.3972 | 1.4011 |
| 435.8 | 1.4014 | 1.4052 |
| 253.7 | 1.422 | 1.4276 |
Feature
- Large band gaps and low phonon energies
- Optical transmission and low thermal lensing distortion
- Absorption edge is 116nm
- Small non-linear refractive indices
- Transparency, tolerance to laser-induced damage
Application
- Lase host media
- Lens in VUV photolithography
Literature
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