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 Neodymium-doped yttrium vanadate (Nd:YVO4) crystal is an excellent laser crystal, which is suitable for manufacturing diode laser pumped especially low-power lasers. Compared to Nd:YAG, Nd:YVO4 possessing a higher absorption coefficient and greater stimulated emission cross section. Diode laser-pumped Nd:YVO4 and LBO, BBO, KTP nonlinear crystals of high coefficient can be used together to achieve better frequency conversion efficiency and obtain all-solid-state lasers having the output from near-infrared, green and blue to UV. Nowadays, Nd:YVO4 laser has been widely used in the areas of mechanical, materials processing, spectroscopy, chip testing, displays, medical testing, laser printing, and data storage. Moreover, Nd:YVO4 diode-pumped solid-state laser is quickly replacing the market share of traditional laser constitute of water-cooled ion laser and light-pumped laser, especially in small and single longitudinal mode output.
Nd:YVO4¨s advantages over Nd:YAG
As high as about five times larger absorption efficient over a wide pumping bandwidth around 808 nm(therefore, the dependency on pumping wavelength is much lower and a strong tendency to the single mode soutput)
As large as three times larger stimulated emission cross-section at the lasing wavelength of 1064nm
Lower lasing threshold and higher slope efficiency
As a uniaxial crystal with a large birefringence, the emission is only a linearly polarized.
Basic Properties of Nd:YVO4
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Atomic Density: |
1.26x1020 atoms/cm3 (Nd1.0%) |
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Crystal Structure: |
Zircon Tetragonal, space group D4h-I4/amd
a=b=7.1193A,c=6.2892A |
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Density: |
4.22g/cm3 |
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Mohs Hardness: |
4-5(Glass-like) |
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Thermal Expansion Coefficient(300K) |
αa=4.43x10-6/K
αc=11.37x10-6/K |
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Thermal Conductivity Coefficient(300K) |
//C:0.0523W/cm/K
〕C:0.0510W/cm/K |
Optical Properties of Nd:YVO4:
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Lasing wavelength: |
1064nm,1342nm |
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Thermal optical coefficient (300K) |
dno/dT=8.5〜10-6/K
dne/dT=2.9〜10-6/K |
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Stimulated emission cross-section: |
25〜10-19cm2 @ 1064nm |
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Fluorescent lifetime: |
90μs(1%) |
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Absorption coefficient: |
31.4cm-1 @810nm |
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Intrinsic loss: |
0.02cm-1 @1064nm |
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Gain bandwidth: |
0.96nm@1064nm |
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Polarized laser emission: |
π polarization; parallel to optic axis(c-axis) |
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Diode pumped optical to optical efficiency: |
>60% |
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Nd:YVO4(mm3) |
KTP SIZ(mm3) |
Pump Power |
OUT (532nm Wave TEM00) |
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3x3x1 |
2x2x5 |
890mW |
76mW |
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3x3x1 |
2x2x5 |
50mW |
2.5mW |
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