|
Ytterbium-doped
Yttrium Aluminium Garnet Crystal (Yb:YAG)
| Yb:YAG
crystal is one of the most promising
laser materials emitting wavelength
at 1030 nm. It is easily to be
pumped by reliable InGaAs laser
diodes at 940 nm, due to its peak
absorption wavelength at around 940
nm. Compared with the commonly used
Nd:YAG crystal, Yb:YAG crystal has a
much larger absorption bandwidth to
reduce thermal management
requirements for diode lasers, a
longer upper-state lifetime, 3-4
times lower thermal loading per unit
pump power. Yb:YAG |
|
crystal
is expected to replace Nd:YAG crystal for
high power diode-pumped lasers and
other potential applications, such as, its
doubling wavelength is 515 nm very close to
that of Ar-ion laser (514 nm), which makes
it possible to replace large volume Ar-ion
laser.
AOTK has grown high quality Yb:YAG crystal
with advanced technique. Disks, rods and
slabs can be available on customers' request
now.
Yb:YAG Advanced Properties
●
High
Slope Efficiency
●
Low
Fractional Heating, Less Than < 11%
●
No
Excited-State Absorption or Up-Conversion
●
Broad
Absorption Bandwidth, about 18 nm @ 940 nm
●
Conveniently
Pumped by Reliable InGaAs Diodes at 940nm
(or 970nm)
●
High
Thermal Conductivity and Strength
Basic Properties
1. Structural and Physical Properties
| Chemical
Formula |
Yb:Y3Al5O12 |
|
Crystal
Structure
|
Cubic
|
|
Lattice
Parameters
|
12.01
Å
|
|
Mohs
Hardness
|
8.5
|
|
Melting
Point
|
1970°C
|
|
Density
|
4.56
g/cm3
|
|
Specific
Heat
|
0.59J/g.cm3
|
|
Modulus
of Elasticity
|
310GPa
|
|
Young's
Modulus
|
3.17X104
Kg/mm2
|
|
Tensile
Strength
|
0.13~0.26GPa
|
|
Thermal
Expansion Coefficient
|
8.2x10-6/K
[100]
7.2x10-6/K
[110]
7.8x10-6/K [111]
|
|
Thermal
optical Coefficient (dn/dT)
|
7.3
x 10-6 °C-1
|
|
Thermal
Shock Resistance
|
790W/m
|
2. Optical and Special Properties
|
Yb
Dopant Concentration
|
5
~ 30 at%
|
| Laser
Wavelength |
1030nm |
| Photon
Energy |
1.93×10-19J
@1030nm |
|
Emission
Linewidth
|
9nm
|
|
Emission
Cross Section
|
2.0×10-20cm2
|
| Fluorescent
Lifetime |
1.2
ms |
|
Diode
Pump Band
|
940
nm or 970 nm
|
| 
