We have confirmed that the photodarkening of Yb-doped fiber (YbDF) has the second-power dependence on a population inversion factor. The photodarkening of a newly developed highly aluminum-doped YbDF has been significantly suppressed.
Specialty optical fibers have contributed to the evolution of fiber lasers, especially in increasing output power, improving efficiency, and diversifying the oscillation wavelength. The authors introduce examples of specialty fibers for such fiber lasers as double clad fibers, non-circular fibers, photonic band gap fibers, photodarkening eliminated fibers, and a fiber-optic optical isolator using SRS (Stimulated Raman scattering).
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