Nonlinear
Crystals
Introduce
Nonlinear
Crystals
Laser
Crystals
Nd:YAG
Er:YAG
Cr4+:YAG
Yb:YAG
Nd:YVO4
Nd:YLF
Ti:Sapphire
Cr:Mg2SiO4
Cr:LiSAF
& Cr:LiCAF
AO
& EO Crystals
Optical
Crystals
|
Ytterbium
Doped Yttrium Aluminum Garnet (Yb: YAG)
|
Yb:
YAG crystal is one of the most promising laser-active
materials and more suitable for diode-pumping then the
traditional Nd-doped systems. It can be pumped at 0.94μm
laser output. Compared with the commonly used Nd: YAG
crystal, Yb: YAG crystal has a much larger absorption
bandwidth to reduces thermal management requirements
for diode lasers, a longer upper-state lifetime, three
to four 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.
Dream
Lasers has developed a suitable technique
to produce the Yb: YAG crystal High quality Yb: YAG
crystals are available with different specifications.
|
|
|
5at%
doped Yb:YAG Crystal
|
|
10at%
doped Yb:YAG Crystal
|
|
20at%
doped Yb:YAG Crystal
|
|
30at%
doped Yb:YAG Crystal
|
Main
Advantages:
●
Very low fractional heating, less than < 11%
● Very high slope efficiency
● Broad absorption bands, about 18nm @ 940nm
● No excited-state absorption or up-conversion
● Conveniently pumped by reliable InGaAs diodes at 940nm
(or 970nm)
● High thermal conductivity and strength |
Basic
Properties |
Chemical
Formula |
Yb:
Y3Al5O12 |
Crystal
Structure |
Cubic |
Lattice
Constants |
12.01Ǻ |
Melting
Point |
1970℃ |
Density |
4.56g/cm2 |
Mohs
Hardness |
8.5 |
Dopant |
5~30%
Yb |
Thermal
Expansion Coefficient |
7.8×10-6/K,[111],0-250℃ |
Thermal
Conductivity |
14W.s/m/K @ 20℃ |
Loss
Coefficient |
0.003cm-1 |
Index
of Refraction |
1.82 |
dn/dT |
9×10-6/℃ |
Lasing
Wavelength |
1030nm,1050nm |
Fluorescence
lifetime |
1.2ms |
Emission
cross section |
2.2×10-20cm2 |
Pump
Wavelength |
0.9~1.0μm |
Absorption
band about pump wavelength |
18nm |
|
|
|