|
Comparing with YAG laser gain materials, Nd:YLF features weak thermal lensing, large fluorescence
line width and naturally polarized oscillation, makes Nd:YLF an excellent material for CW, mode-locked
laser operations.
Basic Physical Properties:
| Crystal Structure |
Tetragonal |
| Lattice Parameters (Å) |
a = 5.16, c = 10.85 |
| Melting Point (¡ãC) |
825 |
| Mohs Hardness |
~5 |
| Density (gram/cm3) |
3.99 |
| Transparency Range |
180nm - 6700nm |
| Thermal Conductivity (W/m/K) |
6.3 |
| Thermal Expansion Coefficients (10-6/K) |
¦Áa = 13.3, ¦Ác = 8.3 |
| Refractive Indices @ 1050nm |
no = 1.4481, ne = 1.4704 |
Laser Gain Properties:
| Lasing Wavelength |
1047nm (¡Îc
axis), 1053nm (¡Íc axis) |
| Stimulated Emission Cross-Section |
1.8 x 10-19 cm2 @1047nm, 1.2
x 10-19 cm2 @1053nm |
| Spontaneous Fluorescent Lifetime |
485 ¦Ìs for 1% Nd doping |
| Absorption Coefficient (1.2% doping) |
¦Á= 10.8 cm-1 @ 792.0 nm E¡Îc
¦Á= 3.59 cm-1 @ 797.0nm E¡Íc |
| Scatter Losses |
0.2% cm-1 |
OSICO Specifications:
| Crystal Orientation and Tolerance |
c cut or
a cut ¡À 1.0° |
| Dopant Concentration |
0.4 - 1.2 atm% |
| Available Rod Diameters |
2 - 8 mm |
| Diameter Tolerance |
¡À 0.1 mm |
| Available Rod Length |
1 - 80 mm |
| Length Tolerance |
¡À 0.5 mm |
| Parallelism |
< 10 arc seconds |
| Perpendicularity |
< 5 arc minutes |
| Chamfer |
0.1mm x 45° |
| Surface Flatness |
¦Ë/10 @ 633nm |
| Surface Quality |
10/5 Scratch/Dig |
| Wavefront Distortion |
¦Ë/4 @ 633nm |
| Standard AR coating Reflectivity |
R < 0.15 @ 1047nm
or 1053nm |
|
