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A rapid and efficient photo-bleaching process was demonstrated with ahigh-energy nanosecond pulse to recover existing and/or revealed color centerson 10 kGy Gamma-irradiated Yb-doped optical fiber. Multi-mJ pulsed laser basedon an optical parametric amplifier system operating at wavelengths of 532 nm,680 nm and 793 nm was used. The photo-bleaching performance is investigated asa function of the wavelength and energy of the pulsed light source. It wasobserved that the photo-bleaching level of the Yb-doped optical fiber increasedwhen the exposure time of the pulsed laser light and the photon energy wasincreased. The results show that the recovery levels of color centers in theYb-doped optical fibers reached up to 96 % in a shorter time by using thepulsed laser compared to that of the studies by using the continuous laser.

Rapid Photo-Bleaching of Gamma-Irradiated Yb-doped Optical Fibers by High-Energy Nanosecond Pulsed Laser