Nd:YVO4 (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:YVO4 a better
choice than Nd:YAG for low-power devices such as hand-held pointers, and
others compact lasers.
With advanced
technology in growing and manufacturing of high quality Nd:YVO4 crystals, Red Optronics supplies a wide variety of finished
crystals. Our standard Nd:YVO4 production
includes:
Main Specifications
|
Nd dopant
concentration |
0.2 ~ 3 atm% |
Dopant
tolerance |
within 10% of concentration |
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% |
Orientation |
a-cut crystalline
direction (+/-5℃) |
Dimensional
tolerance |
+/-0.1mm(typical), High precision +/-0.005mm can be available upon
request. |
Wavefront
distortion |
<λ/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 |
<λ/10 at 632.8nm |
Clear
aperture |
Central 95% |
Chamfer |
0.15x45o |
Damage
threshold |
over 15J/cm2 (rods without
coating) over 700 MW/cm2
(coating) |
|
Notes: To inquire or order a finished Nd:YVO4 laser crystals,
please provide specifications as listed above. For most
applications, we
only need to know the following: 1)Nd-dopant concentration;
2)sizes; 3)surface quality; and 4) coating.
For special
request, please provide detailed specification for evaluation and
fabrication.
Physical Properties
|
|
Atomic
Density |
~1.37x1020
atoms/cm2 |
Crystal
Structure |
Zircon
Tetragonal, space group D4h, a=b=7.118, c=6.293 |
Density |
4.22
g/cm2 |
Mohs
Hardness |
Glass-like, 4.6 ~ 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 |
Melting Point |
1810 ±
25℃ |
Optical
Properties |
|
Lasing
Wavelengths |
914nm,
1064 nm, 1342 nm |
Refractive indexes |
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 |
Thermal
Optical Coefficient |
dna/dT=8.5x10-6/K, dnc/dT=3.0x10-6/K |
Stimulated
Emission Cross-Section |
25.0x10-19 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 |
Intrinsic
Loss |
Less 0.1%
cm-1 , @1064 nm |
Gain
Bandwidth |
0.96 nm
(257 GHz) @ 1064 nm |
Polarized Laser
Emission |
parallel to optic axis
(c-axis) |
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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