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Nd:YVO4

Nd:YVO4 - Neodymium Doped Yttrium Orthovanadate is one of most efficient laser crystal for diode-pumped solid-state lasers. Compared with Nd:YAG, Nd:YVO4 lasers crystal posses the advantages of lower dependency on pump wavelength and temperature control of a diode laser, wide absorption band, higher slope efficiency, lower lasing threshold, linearly polarized emission and single-mode output. For the applications in which compact design and the single frequency output are desired, Nd:YVO4 shows its particular advantages over other commonly used laser crystals.

The Nd:YVO4 diode-pumped compact laser and its frequency-doubled green, red or blue laser light have been used in machining, material processing, spectroscopy, wafer inspection, light show, medical diagnostics, laser printing.

Features of Nd:YVO4 Crystal

- No high voltage power supply needed
- High absorption coefficient, wide absorption bandwidth
- High laser induced damage threshold
- Good physical, optical and mechanical properties.

Properties of Cr⁴⁺:YAG Crystal

Chemical Formula:

Nd³⁺YVO₄

Crystal Structure:

Zircon Tetragonal, space group D4h,

Lattice Constants:

a=b=7.12, c=6.29Å

Melting Point:

1825°C

Density:

4.22 g/cm³

Mohs Hardness:

Glass-like, Mohs 5

Thermal Expansion Coefficient:

α(a)=4.43^-6, α(c)=11.37x10^-6/K

Thermal Conductivity:

//c: 5.23 W/m.K; ⊥c: 5.10 W/m.K

Cr:YAG Optical Properties

Refractive Index:

no=1.9573, ne=2.1652 @1064nm no=1.9721, ne=2.1858 @808 nm no=2.0210, ne=2.2560 @532 nm

Lasing Wavelength:

914 nm, 1064 nm, 1342 nm

Stimulated emission cross section:

25.0 x 10-19/cm² @1064nm

Flouresence Lifetime:

90 µs (1.1% doping), 50 µs ( 2.0% doping)

Thermal Optical Coefficient:

dna/dT = 8.5x10-6/K dnc/dT =3.0x10-6/K

Absorption Coeffient:

31.4/cm @808nm 1.1% doping

Polarized Laser Emission:

π polarization //c

Sellmeier equation( λ in μm):

General Specifications of Nd:YVO4 Laser Crystal

1) Orientation:

a-cut, c-cut crystalline direction (+/-0.5°)

2) Dimension Tolerance:

+0/-0.1mm

3) Surface quality:

10/5 Scratch/Dig

4) Parallelism:

10 arc seconds

5) Perpendicularity:

5 arc minutes

6) Surface flatness:

λ/10 at 633 nm

7) Clear aperture:

Central 90%

8) Chamfer:

0.15mm @45°

9) Damage threshold:

>15J/cm² (without coating) or >700 MW/cm² (coating)

10) Dopant Level:

0.2 mol% ~ 3 mol%

AR Coating:

R < 0.1%@ 1064nm & HT @ 808nm T>95%

HR Coating:

R>99.8%@ 1064nm & HT@ 808nm T>95%

i. Nd:YVO4 laser crystal

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