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Neodymium doped Yttrium Vanadate (Nd:YVO4) is one of the most promising commercially
available diode pumped solid state laser materials. Comparing with Nd:YAG, its 5 times larger absorption
coefficient in a broader band centered at 807nm and favorable mechanical properties make Nd:YVO4 well
suited for compact, efficient, high power diode-pumped lasers. Its natural birefringence gives rise to a
highly polarized output at 1064nm and 1342nm.
Neodymium doped Gadolinium Vanadate (Nd:GdVO4) is an improved laser material based on Nd:YVO4.
Besides the advantages of Nd:YVO4, Nd:GdVO4 exhibits much higher thermal conductivity and optical
conversion efficiency.
Basic Physical Properties:
| |
Nd:YVO4 |
Nd:GdVO4 |
| Crystal Structure |
Tetragonal |
Tetragonal |
| Lattice Parameters (Å) |
a = 7.20, c = 6.29 |
a = 7.21, c = 6.35 |
| Melting Point (¡ãC) |
1825 |
1780 |
| Mohs Hardness |
~5 |
~5 |
| Density (gram/cm3) |
4.24 |
5.47 |
| Transparency Range |
400nm - 3800nm |
400nm - 3800nm |
| Thermal Conductivity (W/m/K) |
¡Íc: 5.1, ¡Îc: 5.23 |
¡Íc: 11.7 |
| Thermal Expansion Coefficients (10-6/K) |
¦Áa = 4.43, ¦Ác = 11.37 |
¦Áa = 1.5, ¦Ác = 7.3 |
| efractive Indices @ 1064nm |
no = 1.958, ne = 2.168 |
no = 1.972, ne = 2.192 |
Laser Gain Properties:
| |
Nd:YVO4 |
Nd:GdVO4 |
| Lasing Wavelength |
1064nm, 1342nm |
1063nm, 1340nm |
| Linewidth |
0.96nm @ 1064nm |
- |
| Stimulated Emission Cross-Section |
25 x 10-19cm2 @ 1064nm |
7.6 x 10-19cm2 @ 1064nm |
| Spontaneous Fluorescent Lifetime |
100 ¦Ìs |
95 ¦Ìs |
| Absorption Coefficient (1.0% doping) |
~ 41 cm-1 @ 808nm |
~ 57 cm-1 @ 808nm |
| Polarized Laser Emission |
¦Ð polarized, parallel to optical axis (c
axis) |
| Scatter Losses |
0.02 cm-1 @ 1064nm |
0.1 cm-1 @ 1064nm |
OSICO Specifications:
| |
Nd:YVO4 |
Nd:GdVO4 |
| Crystal Orientation and Tolerance |
c cut or
a cut ¡À 0.5° c cut ¡À 0.5° |
| Dopant Concentration |
0.1-3.0
atm% |
| Lateral Dimension Tolerance |
¡À 0.1mm |
| Available Rod Length |
60mm |
30mm |
| Length Tolerance |
+0.2mm/-0.1mm |
| Parallelism |
< 20
arc seconds
|
| Perpendicularity |
< 5
arc minutes |
| Chamfer |
0.1mm x
45° |
| Surface Flatness |
¦Ë/8 @ 633nm |
| Surface Quality |
10/5 Scratch/Dig |
| Wavefront Distortion |
¦Ë/4 @ 633nm |
| Standard AR coating Reflectivity |
R <
0.2% @ 1064nm, R < 2.0% @ 808nm |
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