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Nd:YLF
- CASTECH grows Nd:YLF crystals using Czochralski method. The use of high quality starting materials for crystal growth, whole boule interferometry, and precise inspection of scattering particle in crystal using He-Ne laser assures that each crystal will perform well.
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Optical Properties
|
Transparency Range |
180-6700nm |
|
Peak Stimulated Emission Cross Section |
1.8×10-19/cm2(E∥c) at 1047nm |
|
Spontaneous Fluorescence Lifetime |
485 µs for 1% Nd doping |
|
Scatter Losses |
<0.2%/cm |
|
Peak Absorption Coefficient（for 1.2% Nd） |
α= 10.8cm-1 (792.0 nm E∥c) |
|
Laser Wavelength |
1047nm (∥c, a-cut crystal) |
Physical Properties
|
Chemical Formula |
LiY 1.0-x Nd x F4 |
|
Space Group |
I41/a |
|
Nd atoms/cm3 |
1.40 X 1020 atoms/cm3 for 1% Nd doping |
|
Modulus of Elasticity |
85 GPa |
|
Crystal Structure |
Tetragonal |
|
Cell Parameters |
a=5.16 Å , c=10.85 Å |
|
Melting Point |
819℃ |
|
Mohs Hardness |
4~5 |
|
Density |
3.99 g/cm3 |
|
Thermal Conductivity |
0.063 W/cm/K |
|
Specific Heat |
0.79 J/g/K |
|
Thermal Expansion Coefficients |
8.3×10-6/k∥c |
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 |
1.470 |
|
2065 |
1.442 |
1.464 |
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/℃ |
The 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)
CASTECH’s general Nd:YLF production capabilities including：
• Rod sizes from 2mm to 10mm in diameter and from 1mm to 150mm in length;
• Orientation of rod axis to crystal axis within 1 degree;
• Polished only or AR coated rods;
• Nd dopant concentrations between 0.4 and 1.2at%;
• Large rod and slab dimensions and non-standard dopant concentrations are available upon request.
Specifications
|
Standard Dopant |
1.1 ± 0.1% |
|
Wavefront Distortion |
<λ/4 per inch @633nm |
|
Parallelism |
<10 ″ |
|
Perpendicularity |
<5 ′ |
|
Chamfer |
0.13± 0.07mm @45° |
|
Surface Quality |
10/5 |
|
End Coating |
R<0.15%@1047/1053nm |
|
Surface Flatness |
λ/8 @632.8nm |
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Laser Crystals_Nd_YLF Crystal.pdf
