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Ytterbium doped Yttrium Aluminum Garnet (Yb:Y3Al5O12
or Yb:YAG) is one of the most promising laser-active materials and more
suitable for diode-pumping than the traditional Nd-doped crystals. It
can be pumped at 0.94 μm and generates 1.03 μm laser output. Compared
with the commonly used Nd:YAG crystal, Yb:YAG crystal has a larger
absorption bandwidth in order to reduce 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, 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.
Physical and Chemical Properties
|
Chemical formula |
Yb3+:Y3Al5O12 |
|
Crystal structure |
cubic |
|
Lattice Parameters |
12.01A |
|
Melting Point |
1970 ℃ |
|
Density, g/cm3 |
4.56 |
|
Mohs hardness |
8.5 |
|
Thermal expansion coefficient |
7.8 x 10-6 x �K-1 , <111>,
0 - 250 �C
7.7�10-6/ ℃ , <110> (0~250 ℃ )
8.2�10-6/ ℃ , <100> (0~250 ℃ ) |
|
Thermal conductivity at 25�C |
0.14 W x cm-1 x �K-1 |
|
Loss coefficient at 1064 nm |
0.003 cm-1 |
Laser Properties
|
Laser Transition |
2F5/2
→ 2F7/2 |
|
Laser Wavelength |
1030nm |
|
Photon Energy |
1.93�10-19J(@1030nm) |
|
Emission Linewidth |
9nm |
|
Emission Cross Section |
2.0�10-20cm2 |
|
Fluorescence Lifetime |
1.2 ms |
Spectral Properties
|
Diode Pump Band |
940nm or 970nm |
|
Thermal Optical Coefficient |
7.3�10-6/ ℃ |
|
Index of Refraction |
1.82 |
Standard Specifications
|
Dopant concentration, at.% |
0.5-30% |
|
orientation: |
<111>within 5� |
|
Flatness |
< λ/10 |
|
Parallelism |
≤ 10" |
|
Perpendicularity |
≤ 5 ′ |
|
Surface Quality |
10-5(MIL-O-13830A) |
|
Optical Quality: |
Interference fringes ≤ 0.125/inch,
Extinction ration ≥ 30dB |
|
Size: |
Diameter:2
～
20mm,Length:5
～
150mm (Upon request of customer) |
|
Dimensional tolerances |
Diameter:+0.00"/-0.05"mm; Length: � 0.02" ;
Chamfer: 0.07+0.005/-0.00" at 45� |
|
AR Coating Reflectivity |
≤ 0.2% (@1030nm) |
|
