Descriptions:
HGO
grows Nd:YLF laser crystals. Compared to Nd:YAG, the lower thermal conductivity and a weak
negative dn/dT lead to lower thermal distortions and allow to achieve a better
output beam quality.
Optical properties
of Nd:YLF crystal
|
Transparency Range
|
180-6700nm
|
|
Absorption peak wavelength
|
792 nm
|
|
Peak Absorption Coefficient（for 1.2% Nd）
|
α= 10.8cm-1 (792.0 nm E∥c)
α= 3.59cm-1 (797.0 nm E⊥c)
|
|
Absorption bandwidth at peak wavelength
|
~5 nm
|
|
Peak Stimulated Emission Cross Section
|
1.8×10-19/cm2(E∥c) at 1047nm
1.2×10-19/cm2(E⊥c) at 1053nm
|
|
Spontaneous Fluorescence Lifetime
|
485 µs for 1% Nd doping
|
|
Scatter Losses
|
<0.2%/cm
|
|
Laser Wavelength
|
1047nm (∥c, a-cut crystal)
1053nm(⊥c, a or c-cut crystal)
|
Physical properties
of Nd:YLF crystal
|
Chemical Formula
|
LiY 1.0-x Nd x F4
|
|
Space Group
|
I41/a
|
|
Nd atoms/cm3
|
1.40 X 1020 atoms/cm3 for 1% Nd doping
|
|
Modulus of Elasticity
|
85 GPa
|
|
Crystal Structure
|
Tetragonal
|
|
Cell Parameters
|
a=5.16 Å , c=10.85 Å
|
|
Melting Point
|
819℃
|
|
Mohs Hardness
|
4~5
|
|
Density
|
3.99 g/cm3
|
|
Thermal Conductivity
|
0.063 W/cm/K
|
|
Specific Heat
|
0.79 J/g/K
|
|
Thermal Expansion Coefficients
|
8.3×10-6/k∥c
13.3×10-6/ k⊥c
|
|
dn/dT
|
-4,6 × 10-6 (||c) K-1, -6,6 × 10-6 (||a) K-1
|
HGO offers NdYLF
specifications:
|
Doping(atm%):
|
0.01% ~ 3%
|
|
Orientation:
|
A-cut or
C-cut
|
|
Wavefront Distortion:
|
λ/8 per inch @ 632.8 nm
|
|
Dimension Tolerances：
|
rods with diameter: +0.0/-0.05 mm , Length: ±0.1
mm
|
|
Surface Quality:
|
10/5 Scratch/Dig MIL-O-1380A
|
|
Parallelism:
|
< 10″
|
|
Perpendicularity:
|
< 5′
|
|
Clear Aperture:
|
> 90%
|
|
Surface Flatness:
|
< λ/10 @ 632.8 nm
|
|
Chamfer:
|
< 0.1 mm @ 45°
|
|
Barrel Finish
|
50-80 micro-inch (RMS) ,
|
|
Size
|
Upon customer request
|
|
Coating
|
AR/HR/PR coating upon customer’s request
|
|
Damage Threshold
|
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One
year under proper use
|
Other YLF-based Pr/Ho/Tm/Yb/Er/Ce YLF are
also available upon request.
Advantages:
1) High power, low beam
divergence, effective single mode operation
2) High average power Q-switching
at a moderate repetition rate
3) Linear polarized resonators
for Q-switching and frequency doubling
4) Potential uniform mode for
large diameter rods or slabs
5) Stimulated emission cross section is favorable for low CW threshold
6) 1053nm output of Nd:YLF matches gain curves of Nd:Glass and performs well
as an oscillator and pre-amplifier for this host
Why
Choose HGO ?
HG
OPTRONICS.,INC. grow YLF-based crystals in house using CZ growth
technology. The use of high quality starting materials for crystal growth,
whole boule interferometry, precise inspection of scattering particle in
crystal using He-Ne laser and delicated measurement of bulk losses using
spectrophotometer assures that each crystal will comply with customer’s specification and perform well.
And base on our diffusion bonding
technology various YLF-based configurations are availabl to supply, especially
in the form of YLF/NdYLF diffusion bonding.
