Descriptions:
Nd:YVO4 (Neodymium
Doped Yttrium Orthovanadate) crystals is one of the most promising
commercially available diode pumped solid state laser materials, especially, for
low to middle power density. It has been
incorporated with high NLO coefficient crystals ( LBO, BBO, or KTP) to
frequency-shift the output from the near infrared to green, blue, or even UV.
Physical
properties:
|
Atomic Density:
|
1.26x1020 atoms/cm3 (Nd1.0%)
|
|
Crystal Structure:
|
Zircon Tetragonal, space group D4h-I4/amd
a=b=7.1193A,c=6.2892A
|
|
Density;
|
4.22g/cm3
|
|
Mohs Hardness:
|
4-5(Glass-like)
|
|
Thermal Expansion Coefficient(300K):
|
αa=4.43x10-6/K
αc=11.37x10-6/K
|
|
Thermal Conductivity Coefficient(300K):
|
//C:0.0523W/cm/K
⊥C:0.0510W/cm/K
|
Optical
properties:
|
Lasing wavelength:
|
1064nm,1342nm,914nm
|
|
Thermal optical coefficient (300K):
|
dno/dT=8.5×10-6/K
dne/dT=2.9×10-6/K
|
|
Stimulated emission cross-section:
|
25×10-19cm2 @ 1064nm
|
|
Fluorescent lifetime:
|
90μs(1% Nd doping)
|
|
Absorption coefficient:
|
31.4cm-1 @810nm
|
|
Intrinsic loss:
|
0.02cm-1 @1064nm
|
|
Gain bandwidth:
|
0.96nm@1064nm
|
|
Polarized laser emission:
|
π polarization; parallel to
optic axis(c-axis)
|
|
Diode pumped optical to optical efficiency:
|
≥50%
|
|
Sellemeier equations (λ in um)
|
n02=3.77834+0.069736/(λ2-0.04724)-0.010813λ2
ne2=4.59905+0.110534/(λ2-0.04813)-0.012676λ2
|
Laser
properties:
The major laser properties of Nd:YVO4 vs Nd:YAG are listed in
Table below, including stimulated emission cross-sections (σ), Absorption Coefficient (α) Fluorescent
lifetime (τ),Absorption Length (La),threshold Power (Pth) and Pump
Quantum Efficiency.
|
Laser crystal
|
Doping
(atm%)
|
σ
(x10-19cm2)
|
α
(cm-1)
|
τ
(µs)
|
Lα (mm)
|
Pth
(mW)
|
Effi.
(%)
|
|
Nd:YVO4
(a-cut)
|
1.0
2.0
|
25
25
|
23
46
|
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
|
HGO offers
NdYVO4 specifications:
|
Doping
|
0.07%~3%
|
|
Doping concentration tolerance
|
±0.05%(atm%<1%),±0.1%(atm%≥1%)
|
|
Orientation
|
A-cut/C-cut +/-0.5deg.
|
|
Dimension Tolerance
|
±0.1mm
|
|
Flatness
|
λ/10 @ 632.8nm
|
|
Wavefront distortion
|
λ/6@ 632.8nm
|
|
Surface Quality
|
10/5 per MIL-O-13830B
|
|
Parallelism
|
10″
|
|
Perpendicularity
|
10′
|
|
Bevel/Chamfer
|
<0.1mm@45deg.
|
|
Chips
|
<0.1mm
|
|
Clear Aperture
|
>95%
|
|
Coating
|
AR/HR/PR (IAD, EB, IBS)
coating upon customer’s request
|
|
Damage Threshold
|
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One year
under proper use
|
Advantages:
1)
Low lasing threshold and high slope efficiency
2)
Low dependency on pumping wavelength and strong tendency to
single mode output.
3)
Large stimulated emission cross-section at lasing wavelength
of 1064nm.
4)
High absorption over a wide pumping wavelength bandwidth
5)
A uniaxial crystals with large birefringence emit
linearly-polarized laser.
Why
Choose HGO ?
HG
OPTRONICS.,INC. has the ability to grow high purity Nd:YVO4 (Neodymium Doped
Yttrium Orthovanadate) laser crystals. Totally 4 sets of growth furnances are
used to grow vanadate crystals which are processed and sold to endusers all
over the world. We can offer Nd：YVO4 crystals with wide range of doping
concentration from 0.07% to 3% with both good quality and high competitive
price. What is more, based on our
diffusion bonding technology, NdYVO4 composite are extremely useful for higher
power vanade based laser systems.
