|NONLINEAR SPACE-TIME CONTROL OF OPTICAL PULSES WITH ACTIVE MULTIMODE FIBERS AND FIBER LASERS
Large mode area based ytterbium doped double cladding fibers typically used to fabricate high power fiber lasers allow the propagation of a few modes. Currently, the main limitation to the operation of high power large mode area fiber amplifiers is the mode instability effect. This effect leads to beam widening, which corresponds to the excitation of high order modes. The wide beam can be reconverted into a narrow beam or fundamental mode by means of a light-induced index grating provided by Kerr beam cleaning. The suppression of transverse mode instabilities in active multimode fibers by means of Kerr beam self cleaning effect will enable multimode fiber amplifier and laser technologies to overcome the current limitation to simultaneously achieving high pulse energy and high average power. My research activity is to achieve self-induced beam cleaning and control with a doping element added in multimode fiber core, and investigate the application of active multimode fibers to high power fiber lasers.”
Mesay Addisu was born in Kuyu (Ethiopia). He received his BSc (July 2009) in Electrical Engineering from Hawassa University (Ethiopia) and MSc (July 2017) in Communication Technologies and Multimedia from University of Brescia (Italy). He joined Ethio Telecom after the BSc graduation from November 2009 to September 2014 as a Junior Electrical Engineer and later IP Network Technician. Since November 2017, he is a PhD student at University of Brescia (Italy) in Telecommunication Engineering.
Curriculum: Telecommunication Engineering
Tutor e Relatore: Stefan WABNITZ
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