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Nd:YLF (Nd:LiYF4) offers an alternative to the more common YAG host for near IR operation. The combination of weak thermal lensing (19 times lower than that of YAG), large fluorescence line width and naturally polarized oscillation makes Nd:YLF an excellent material for CW, modelocked operation. 1.053 µm output of Nd:YLF matches gain curves of Nd:Glass and performs well as an oscillator and pre-amplifier for this host. YLF is grown utilizing the modified Czochralsky technique. The as-grown crystals are then processed into laser rods or slabs, coated in house, and inspected per customer specifications.
Nd:YLF Crystal Physical Properties:
|
Chemical Formula |
LiY1.0-xNdxF4 |
|
Space Group |
141/a |
|
Nd atoms/m3 |
1.40X1020atoms/cm3 for 1% Nd doping |
|
Modulus of Elasticity |
85 GPa |
|
Crystal Structure |
Tetragonal |
|
Cell Parameters |
a=5.16Å, c=10.85Â |
|
Melting Point |
819℃ |
|
Mohs Hardness |
4~5 |
|
Density |
3.99g/cm3 |
|
Thermal Expansion Coefficient |
0.063W/cm K |
|
Specific Heat |
0.79J/gK |
|
Thermal Conductivity |
8.3x10-6/k ‖c 13.3x10-6/k ┴c B |
Nd:YLF Crystal Optical Properties:
|
Transparency range |
180-6700nm |
|
Peak Stimulated Emission Cross Section |
1.8x10-19cm2 (E‖C)at 1064nm 1.2x10-19cm2 (E┴C)at 1053nm |
|
Spontaneous Fluorescence Lifetime |
485μs for 1% Nd doping |
|
Scatter Losses |
<0.2%/cm |
|
Peak Absorption Coefficient (for 1.2% Nd doping) |
a=10.8cm-1(792.0 nm E‖C) a=3.59cm-1(797.0 nm E┴C) |
|
Laser Wavelength |
1047nm(‖c, a-cut crystal)
1053nm(┴c, a or c-cut crystal) |
|
Sellemeier equations (λ in um) |
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) |
Nd:YLF Standard Product Specifications:
|
Standard Dopant |
1.1±0.1% |
|
Diameter |
2mm ~ 10mm |
|
Length |
1mm ~ 100mm |
|
Orientation |
a-axis or c-axis |
|
Wavefront Distortion |
<λ/4 per inch @633nm |
|
Surface Flatness |
λ/8@632.8nm |
|
Parallelism |
<10 arc seconds |
|
Perpendicularity |
<5 arc minutes |
|
Chamfer |
0.13±0.07mm@45° |
|
Surface Quality |
10/5(MIL-PRF-13830B) |
|
End Coating |
R<0.15%@1047/1053nm |