Description
Introduction
- Rod sizes from 2 mm to 10 mm in diameter and from 1 mm to 150 mm in length
- Orientation of rod axis to crystal axis <1 degree
- Polished only or AR coated rods
- Nd dopant concentrations between 0.4 and 1.2 at.%
- Large rod and slab dimensions and non-standard dopant concentrations are available upon request
Table 1. Basic Properties
| Chemical Formula | LiY1.0-xNdxF4 |
| Crystal Structure | Tetragonal |
| Space Group | I41/a |
| Nd (at/cm3) | 1.40 × 1020 at/cm3 for 1% Nd doping |
| Modulus of Elasticity | 85 GPa |
| Lattice Parameter | a = 5.16 Å, c = 10.85 Å |
| Melting Point | 819℃ |
| Mohs Hardness | 4~5 Mohs |
| Density | 3.99 g/cm3 |
| Thermal Conductivity | 0.063 W/cm/K |
| Specific Heat | 0.79 J/g/K |
| Thermal Expansion Coefficient | 8.3 × 10-6 /K∥c, 13.3×10-6 /K⊥c |
Table 2. Optical Properties
| Transparency Range | 180-6700 nm |
| Peak Stimulated Emission Cross Section | 1.8 × 10-19 /cm2 (E∥c) at 1047 nm
1.2 × 10-19 /cm2 (E⊥c) at 1053 nm |
| Fluorescence Lifetime | 485 µs for 1% Nd doping |
| Scatter Losses | <0.2% /cm |
| Peak Absorption Coefficient
(for 1.2% Nd) |
α = 10.8 cm-1 (792.0 nm E∥c)
α = 3.59 cm-1 (797.0 nm E⊥c) |
| Laser Wavelength | 1047 nm (∥c, a-cut crystal)
1053 nm (⊥c, a or c-cut crystal) |
| Sellmeier Equations (λ in µm): | |
| no2 = 1.38757 + 0.70757λ2 / (λ2 – 0.00931) + 0.18849λ2 / (λ2 – 50.99741)
ne2 = 1.31021 + 0.84903λ2 / (λ2 – 0.00876) + 0.53607λ2 / (λ2 – 134.9566)
|
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Table 3. Index of Refraction
| Wavelength (nm) | no | ne |
| 262 | 1.485 | 1.511 |
| 350 | 1.473 | 1.491 |
| 525 | 1.456 | 1.479 |
| 1050 | 1.448 | 1.47 |
| 2065 | 1.442 | 1.464 |
Table 4. dn / dT
| Wavelength (nm) | E // c | E ⊥ c |
| 436 | -2.44 × 10-6/℃ | -0.54 × 10-6/℃ |
| 578 | -2.86 × 10-6/℃ | -0.91 × 10-6/℃ |
| 1060 | -4.30 × 10-6/℃ | -2.00 × 10–6/℃ |
Specifications of Nd:YLF crystal
Table 5. Specifications
| Standard Dopant Concentration | Nd: 1.1 ± 0.1% |
| Surface quality (scratch/dig) | 10/5 to MIL-PRF-13830B |
| Wavefront Distortion | ≦λ/4 @633 nm |
| Surface Flatness | λ/8 @633 nm |
| Parallelism | 20 arc sec |
| Perpendicularity | ≦15 arc min |
| Chamfer | ≦0.2 mm × 45° |
| End Coating | R<0.15% @1047/1053 nm |
