Nd:YLF (Neodymium Doped Lithium Yttrium Fluorides, Nd:LiYF4)
Nd:YLF 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, ML operation, and Q-SW operation at a moderate repetition rate. The linear polarized beam is ideal for Q-switching and frequency doubling. The 1.053 µm output matches gain curves of Nd:Glass and performs well as an oscillator and pre-amplifier for this host. |
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Basic Properties
| Formula |
Nd:LiYF4 |
| Structure symmetry |
Tetragonal , I41/a |
| Lattice constants |
a=5.16Å, b=10.85Å |
| Melting point |
819℃ |
| Hardness ( Mohs) |
4 ~ 5 |
| Density |
3.99 g/cm3 |
| Thermal conductivity |
0.063 W cm-1 K-1 |
| Thermal expansion |
8.3x10-6/K (^c) , : 13.3x10-6/K (||c) |
| Transmission range |
180 to 6700 nm |
| Refractive index (@1053nm) |
no=1.448, ne=1.470 |
| Fluorescent lifetime |
485us for 1% Nd doping |
| Peak emission cross section |
1.8 x 10-19/cm2 @1053nm |
| Yong modules |
7.65x108 g/cm2 |
| Lasing wavelength |
1053nm ( ^c),1047nm ( //c) |
| Peak absorption wavelength |
a=10.8cm-1 (792.0 nm E || c)
a=3.59cm-1 (797.0 nm E ^ c) |
Standard Products
The standard products are cut along a-axis of the crystal. The ends of the crystal are either Brewster angle cut or anti-reflection coated at 1053nm (or 1047nm).
Please contact Lasertec for your specific requirement of Nd:YLF.
Specifications on finished products
Diameter tolerance: |
+/-0.1mm |
Length tolerance: |
+/-0.5mm |
Wavefront distortion: |
l/8 per inch at 632.8nm |
Surface quality: |
better than 10/5 Scratch/Dig per MIL-O-1380A |
Parallelism: |
< 10 arc seconds |
Perpendicularity: |
< 5 arc minutes |
Surface flatness: |
<l/10 at 632.8nm |
Clear aperture: |
Central 90% |
Chamfer: |
0.15mm x 45 deg |
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