Broadband，Inc.,取扱製品光学素子

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.

　

We have recently developed a suitable technique to produce the Yb:YAG crystal High quality Yb:YAG crystals are available with different specifications

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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

High Power Ultrafast Laser Crystal Yb:YAG

5%doped Yb:YAG laser crystal

10%doped Yb:YAG laser crystal

20%doped Yb:YAG laser crystal

30%doped Yb:YAG laser crystal

After annealing all the Yb:YAG crystals are colorless

Specifications

Chemical Formula	Yb:Y₃Al₅O₁₂
Crystal Structure	Cubic
Lattice Constants	12.01Å
Melting Point	1970 ° C
Density	4.56 g/cm²
Mohs Hardness	8.5
Dopant	5～30% Yb
Thermal Expansion Coefficient	7.8´ 10^-6 /K, [111], 0-250° C
Thermal Conductivity	14 W× s /m /K @ 20° C
Loss Coefficient	0.003 cm^-1
Index of Refraction	1.82
dn/dT	9´ 10^-6/° C
Lasing Wavelength	1030nm, 1050nm
Fluorescence lifetime	1.2ms
Emission cross section	2.2´ 10^-20cm²
Pump Wavelength	0.9~1.0m m
Absorption band about pump wavelength	18nm

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