YbYAG

Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the  commonly used Nd:YAG crsytal , Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level 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. 
In the specific case of the host material YAG, Yb3+ has a storage lifetime of 950 µs and a quantum defect of only 8.6%. Yb3+:YAG also has a broad pump line at 940 nm that is 10 times broader than the 808 nm pump line in Nd3+YAG making the system less sensitive to thermal drift of the pump diodes wavelength. These material properties combined with the development of robust long-lifetime InGaAs pump diodes at 940 nm have made this material a superior candidate for diode-pumped high-energy lasers.
Crystals of Yb3+ doped YAG are available in a variety of dopant concentrations from 1% - 100% (e.g. Ytterbium aluminum garnet - YbAG).
 

Advantages:


1. High optical quality
2. Very high slope efficiency
3. Very low fractional heating, less than11%
4. No excited-state absorption or up-conversion
5. Broad absorption bands, about 8nm@940nm
6. High thermal conductivity and large mechanical strength
7. Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm)
 

Specifications

Dopant concentration
Yb:0.3~15at%
Orientation
[100]or[111]within 5°
Wavefront Distortion
≤0.125λ/inch
Extinction
≥28dB
Rod Sizes
Diameter: 2~20mm, length: 5~150mm Upon request of customer
Dimensional Tolerances
Diameter: +0.00/-0.05mm, length:±0.5mm
Barrel Finish
Ground Finish with 400# grit or polished
Parallelism
≤10”
Perpendicularity
≤5’
Flatness
λ/10@632.8nm
Surface Quality
10-5(MIL-O-13830A)
Chamfer
0.15±0.05mm
AR Coating Reflectivity
≤0.25%(@1030nm)
Damage Threshold
500MW/cm210ns 1Hz at 1064nm

Main Properties of Yb:YAG crystal:

Chemical Formula
Yb3+:Y3AI5O12
Laser Wavelength
1030nm
Fluorescence Lifetime
1.2 ms
Index of Refraction
1.82
Loss Coefficient
0.003 cm-1
Crystal Structure
Cubic
Lattice Parameters
12.01 Å
Melting Point
1970℃
Moh Hardness
8.5
Density
4.56±0.04g/cm3
Specific Heat (0-20)
0.59J/g.cm3
Thermal Expansion Coefficient
[111]Direction:7.8×10-6/℃(0~250℃)
Thermal Conductivity
14W/m/K(@20℃) , 10.5W/m/K(@100℃)
 

Standard Products

 

Part No
Diameter(mm)
Length(mm)
Doping
Cut angle
Coating
YbYAG-1510-20
15
1
20%
<111>
AR/AR1030 nm
YbYAG-1510-15
15
1
15%
<111>
AR/AR1030 nm
YbYAG-1205-20
12.7
0.5
20%
<111>
AR/AR1030 nm
YbYAG-1205-15
12.7
0.5
15%
<111>
AR/AR1030 nm