Applications | ◆For Single-longitudinal-mode output and compact design | |||
◆Diode laser-pumped Nd:YVO4 compact laser and its frequency-doubled green, red or blue laser will be the ideal laser tools of machining, material processing, spectroscopy, wafer inspection, light show, medical diagnostics, laser printing and other most widespread applications | ||||
Features | ◇Better choice than Nd:YAG for low-power devices such as hand-held pointers, and others compact lasers | |||
◇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. | ||||
Main Specification | Material | Neodymium Doped Yttrium Orthovanadate | ||
Nd dopant concentration Dopant tolerance |
0.1 - 5.0 atm% | |||
Diameter | 3×3×3 mm3, 3×3×1 mm3, 3×3×0.5 mm3 | |||
Length | 0.02 ~ 20mm | |||
Dimensional Tolerance | ±0.1mm | |||
Coating | AR @ 1064nm, R< 0.1% & HT @ 808nm, T>95% HR @ 1064nm, R>99.8% & HT@ 808nm, T>9% HR @ 1064nm, R>99.8%, HR @ 532 nm, R>99% & HT @ 808 nm, T>95% |
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Orientation | a-cut crystalline direction (+/-5℃) | |||
Orientation Tolerance | ±0.5deg | |||
Wavefront Distortion | <λ/8 at 633nm | |||
Surface quality Scratch/Dig | 10/5 Scratch and Dig | |||
Parallelism | < 10 arc sec | |||
Perpendicularity | < 5 arc min | |||
Surface flatness | <λ/10 at 632.8nm | |||
End-faces Configuration | Plano/Plano | |||
Clear aperture | > Central 90% | |||
Chamfer | 0.15×45o | |||
Damage Threshold | over 15J/cm2 (rods without coating) over 700 MW/cm2 (coating) |
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Physical and Chemical Properties | Crystal Structure | Zircon Tetragonal, space group D4h-I4/amd a=b=7.1193A,c=6.2892A |
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Dimensional tolerances | +/-0.1mm(typical), High precision +/-0.005mm can be available upon request |
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Melting Point | 1810 ± 25℃ | |||
Atomic Density | ~1.37×1020 atoms/cm2 | |||
Density/密度 | 4.22 g/cm3 | |||
Mohs Hardness | Glass-like, 4.6 ~ 5 | |||
Refractive Index | positive uniaxial, no=na=nb ne=nc no=1.9573, ne=2.1652, @ 1064nm no=1.9721, ne=2.1858, @ 808nm no=2.0210, ne=2.2560, @ 532nm |
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Thermal Expansion Coefficient | (300K) αa=4.43×10-6/K αc=11.37×10-6/K |
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Thermal Conductivity | //C:0.0523W/cm/K ⊥C:0.0510W/cm/K |
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Optical properties | Lasing Wavelength | 914nm, 1064 nm, 1342 nm | ||
Scattering | Invisible, probed with a He-Ne laser | |||
Stimulated Emission Cross Section | 25.0×10-19 cm2 , @1064 nm | |||
Fluorescent Lifetime | 90 ms (about 50 ms for 2 atm% Nd doped) @ 808 nm | |||
Absorption Coefficient | 31.4 cm-1 @ 808 nm | |||
Absorption Length | 0.32 mm @ 808 nm | |||
Polarized Laser Emission | parallel to optic axis (c-axis) | |||
Thermal Optical Coefficient | dno/dT=8.5×10-6/K dne/dT=2.9×10-6/K (300K) |
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Intrinsic Loss | < 0.1% cm-1 , @1064 nm | |||
Gain Bandwidth | 0.96 nm (257 GHz) @ 1064 nm | |||
Diode Pumped Optical to Optical Efficiency | > 60% | |||
Sellmeier Equation (for pure YVO4 crystals) | no2(λ) =3.77834+0.069736/(λ2 - 0.04724) - 0.0108133λ2 no2(λ) =4.59905+0.110534/(λ2 - 0.04813) - 0.0122676λ2 |
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Crystal Class | Positive uniaxial, no=na=nb, ne=nc, no=1.9573, ne=2.1652, @1064nm no=1.9721, ne=2.1858, @808nm no=2.0210, ne=2.2560, @532nm |