Introduction
Nd:YVO4
is one of the most efficient laser host crystal currently existing for
diode laser-pumped
solid-state lasers. Nd:YVO4 is an excellent crystal for high
power, stable and cos
4
Low
lasing threshold and high slope efficiency
4
Large
stimulated emission cross-section at lasing wavelength
4
High
absorption over a wide pumping wavelength bandwidth
4
Optically
uniaxial and large birefringence emits polarized laser
4
Low dependency on pumping wavelength and tend to single mode output
CRYSTECH massively produces and provides
high quality Nd:YVO4 crystals at competitive prices.
Basic Properties:
Atomic Density:
|
1.26x1020 atoms/cm3 (Nd 1.0%)
|
Crystal Structure:
|
Zircon Tetragonal, space group D4h-I4/amd
a=b=7.1193, c=6.2892
|
Density:
|
4.22g/cm3
|
Mohs Hardness:
|
4-5 (Glass-like)
|
Thermal Expansion Coefficient (300K):
|
a a=4.43x10-6/K
a
c=11.37x10-6/K
|
Thermal Conductivity Coefficient (300K):
|
//C: 0.0523W/cm/K
^
C: 0.0510W/cm/
K
|
Optical Properties:
Lasing
wavelength:
|
1064nm,
1342nm
|
Thermal optical coefficient (300K):
|
dno/dT=8.5x
10-6/K
dne/dT=2.9x 10-6/K
|
Sellmeier
Equation
(for pure YVO4 crystals):
|
no2=3.77834+0.069736/(l2-0.04724)-0.0108133.l2
ne2=4.59905+0.110534/(l2-0.04813)-0.0122676.l2
|
Stimulated emission cross-section:
|
25x
10-19cm2
@1064nm
|
Fluorescent
lifetime:
|
90m
s
|
Absorption
coefficient:
|
31.4cm-1
@810nm
|
Intrinsic
loss:
|
0.02cm-1
@1064nm
|
Gain
bandwidth:
|
0.96nm
@1064nm
|
Polarized
laser emission:
|
p
polarization; parallel to optic axis(c-axis)
|
Diode
pumped optical to optical efficiency:
|
>60%
|
Laser
Properties:
The
Nd:YVO4 crystal has large stimulated emission cross-sections
at both 1064nm and 1342nm. The
stimulated emission cross-section of an a-axis cut Nd:YVO4
crystal at 1064nm is about 4 times higher than that of the Nd:YAG crystal.
Although the lifetime of Nd:YVO4 is about 2.7 times shorter
than that of Nd:YAG. Because of its high pump quantum efficiency, the
slope efficiency of Nd:YVO4 can be very high if the laser cavity
is properly designed. Table 1 lists the major laser properties of Nd:YVO4
in comparison with those of Nd:YAG.
Table 1. Laser Properties of Nd:YVO4
Laser
crystal |
Doping(atm%)
|
s(x10-19cm2)
|
a
(cm-1) |
t
(ms) |
la
(mm) |
Pth(mW)
|
h
s(%) |
Nd:YVO4(a-cut)
|
1.0
2.0 |
25
25 |
31.2
72.4 |
90
50 |
0.32
0.14 |
30
78 |
52
48.6 |
Nd:YVO4(c-cut)
|
1.1
|
7
|
9.2
|
90
|
¡@ |
231
|
45.5
|
Nd:YAG
|
0.85
|
6
|
7.1
|
230
|
1.41
|
115 |
38.6
|
Diode pumped Nd:YVO4 laser output comparing
with diode pumped Nd:YAG laser.
Crystals
|
Size
(mm3) |
Pump
Power |
Output
(at 1064nm) |
Nd:YVO4
|
3x3x1
|
850mW
|
350mW
|
Nd:YVO4
|
3x3x5
|
15W
|
6W
|
Nd:YAG
|
3x3x2
|
850mW
|
34mW
|
Nd YVO4's Specification:
Nd: Dopant Level
|
0.1 - 3.0 atm%
|
Wavefront Distortion
|
< l/8 at 633 nm
|
Scattering Sites
|
invisible, probed with a He-Ne laser
|
Orientation
|
¡Ó0.5deg.
|
Dimensional Tolerance
|
¡Ó0.1mm
|
End-faces Configuration
|
Plano/Plano
|
Surface quality
|
10/5 Scratch/Dig per MIL-O-13830B
|
Flatness
|
l/10 at 633 nm
|
Clear Aperture
|
> Central 90%
|
Parallelism
|
< 10 arc sec.
|
Intrinsic Loss
|
< 0.1% cm-1
|
Standard
Products
Part
No. |
Doping
|
Dimension
|
Coating
|
NYV2301
|
2%
|
3x3x1mm
|
HR/AR
Coating |
NYV2302 |
2%
|
3x3x1mm
|
AR/AR
Coating |
NYV1301 |
1%
|
3x3x1mm
|
HR/AR
Coating |
NYV1305 |
1%
|
3x3x5mm
|
AR/AR
Coating |
NYV5310 |
0.5%
|
3x3x10mm
|
AR/AR
Coating |
NYV7408 |
0.27% |
4x4x8mm |
AR/AR
Coating |
AR/AR:
S1:AR@1064(R<0.1%)&532nm(R<0.5%)
HT@808nm(R<5%); S2:AR@1064&532nm
HR/AR: S1:HR@1064(R>99.8%)&532nm(R>99%)
HT@808nm(R<5%);
S2:AR@1064&532nm
Note:
Other
specifications of Nd:YVO4 crystals and coatings are also available
upon request.
Nd:YVO4+KTP for Green Laser Pointer
The
most outstanding advantage of DPSS laser is its compact package, especially
for Green Laser Pointer. CRYSTECH supply which combine Nd:YVO4
crystal with KTP crystal, resulting in efficient, ultra-compact, diode
pumped laser devices emitting the green laser. It greatly reduces your
material cost and enhances assembling efficiency.
•
Diode pumped Nd:YVO4+KTP green laser point
Nd:YVO4
(mm3) |
KTP
(mm3) |
Pump
Power |
Output
|
2x2x1
|
2x2x3
|
150mW
|
>1mW
|
3x3x1
|
3x3x5
|
500mW
|
>20mW
|
Coating:
S1: R>99.8% @1064 nm, R<5% @808 nm;S2: R>99.8% @1064 nm, R<5%
@532 nm
Standard Products
Part
No. |
Nd:YVO4 |
KTP |
PDM01 |
2x2x1 |
2x2x3mm |
PDM02 |
2x2x1 |
2x2x5mm |
PDM03 |
3x3x1 |
3x3x5mm |
|