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     Nd:YVO 4
Home >> Laser Crystal >> Nd:YVO 4 

Yttrium vanadate has been growing in popularity because of its high gain, low threshold, and high absorption coefficients at pumping wavelengths, which result from the excellent fit of the neodymium dopant in the crystal lattice. These advantages make Nd:YVO 4 is a better choice than Nd:YAG for low-power devices such as hand-held pointers, and others compact lasers.

With advanced technology on growing and manufacturing high optical quality Nd:YVO 4 crystals, Dayoptics can provide a wide variety of finished crystals, our general Nd:YVO 4 production capabilities include:

1)Nd dopant concentration: 0.2 ~ 3 atm%
Dopant tolerance: within 10% of concentration
2)Length: 0.02 ~ 20mm
Length: 0.02 ~ 20mm
Coating Specification:

  • 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%
  • AR @ 1064 nm, R < 0.1%
Typical specification and tolerance:
Orientation a-cut crystalline direction (+/-0.5C)
Dimensional tolerance +/-0.1mm(typical), High precision +/-0.005mm can be available upon request.
Wavefront Distortion < /8 at 633nm
Surface quality better than 20/10 Scratch/Dig per MIL-O-1380A
Parallelism < 10 arc seconds
Perpendicularity < 5 arc minutes
Surface flatness < /10 at 632.8nm
Clear aperture Central 95%
Chamfer 0.15x45
Damage threshold over 15J/cm 2 (rods without coating) over 700 MW/cm 2 (coating)

Notes:

To inquiry or order a finished Nd:YVO 4 laser crystals, please specify the specification listed above, for common application, we only need to know the main specification:
1) Nd-dopant concentration. 2) sizes. 3) surface quality. 4) coating specification.
For special request, please specify specification in details for evaluation and fabrication.

 
Physical and Optical properties
Atomic Density ~1.37x10 20 atoms/cm 2
Crystal Structure Zircon Tetragonal, space group D4h, a=b=7.12, c=6.29
Density 4.22 g/cm3
Mohs Hardness Glass-like, ~5
Thermal Expansion Coefficient aa=4.43x10-6/K, ac=11.37x10-6/K
Thermal Conductivity Coefficient ||C: 5.23 W/m/K; ^C: 5.10 W/m/K
Lasing Wavelengths 914nm, 1064 nm, 1342 nm
Crystal Class positive uniaxial, n o =n a =n b n e =n c
n o =1.9573, n e =2.1652, @ 1064nm
n o =1.9721, n e =2.1858, @ 808nm
n o =2.0210, n e =2.2560, @ 532nm
Thermal Optical Coefficient dn a /dT=8.5x10 -6 /K, dn c /dT=3.0x10 -6 /K
Stimulated Emission Cross-Section 25.0x10 -19 cm 2 , @1064 nm
Fluorescent Lifetime 90 m s (about 50 m s for 2 atm% Nd doped) @ 808 nm
Absorption Coefficient 31.4 cm -1 @ 808 nm
Absorption Length 0.32 mm @ 808 nm
Intrinsic Loss Less 0.1% cm -1 , @1064 nm
Gain Bandwidth 0.96 nm (257 GHz) @ 1064 nm
Polarized Laser Emission p arallel to optic axis (c-axis)
Diode Pumped Optical to Optical Efficiency > 60%
Sellmeier Equation (for pure YVO 4 crystals) n o 2 =3.77834+0.069736/( l 2 - 0.04724) - 0.0108133. l 2
n o 2 =4.59905+0.110534/( l 2 - 0.04813) - 0.0122676. l 2

 

Nd:YVO 4 properties compare with Nd:YAG

 

properties Nd:YAG, 1 atm% Nd Nd:YVO 4 1 atm% Nd
Fluorescence lifetime ( t ) 230 m s 100 m s
Stimulated emission cross section ( s ) s 21=2.7-8.8x10-19cm-2 15.6x10-19cm-2( p -pol)
Absorption coefficient 7.1cm-1 31.2 cm-1
La 1.41mm 0.32mm
Threshold power 115mw 78mw
Converstion efficiency h s 38.6% 48.6%
Thermal conductivity coefficient ||c:14w/m/k ^ c: 10.5w/m/k ||c:5.23w/m/k ^ c: 5.10w/m/k
Highest dopant level 1.2% 3%
Crystals length for the same output power(<200mw) ~5mm (1%) ~0.5mm (3%)
~1mm (1%)
Crystals length for the same output power(~2w) ~50(1%) 5mm(0.5%)