Experimental observation of a novel effect of long-term mode shape degradation in a high peak power ytterbium-doped pulsed fiber lasers based on large mode area step-index fibers has been reported for the first time. It is shown, that the degradation is caused by power coupling from LP01 to LP11 mode, occurring on a long period refractive index grating (LPG) formed in the active fiber core. The photo-darkening process was found to play a significant role in the formation of a LPG.
Konstantin K. Bobkov, Mikhail M. Bubnov, Svetlana S. Aleshkina, and Mikhail E. Likhachev, "The first experimental observation of long-term mode degradation in high peak power Yb-doped amplifiers," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830T (Presented at SPIE LASE: January 31, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2251734.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.
Monte Carlo based light propagation models to improve efficacy of biophotonics based therapeutics of hollow organs and solid tumours including photodynamic therapy and photobiomodulation (Conference Presentation)