Kerse, C.Kalaycioʇlu, H.Elahi, P.Akçaalan, Ö.Ilday, F. Ö.2018-04-122018-04-1220160030-4018http://hdl.handle.net/11693/36795We report on an all-fiber Yb laser amplifier system with an intra-burst repetition rate of 3.5 GHz. The system is able to produce minimum of 15-ns long bursts containing approximately 50 pulses with a total energy of 215μJ at a burst repetition rate of 1 kHz. The individual pulses are compressed down to the subpicosecond level. The seed signal from a 108 MHz fiber oscillator is converted to approximately 3.5 GHz by a multiplier consisting of six cascaded 50/50 couplers, and then amplified in ten stages. The highly cascaded amplification suppresses amplified spontaneous emission at low repetition rates. Nonlinear interactions between overlapping pulses within a burst is also discussed.EnglishBurst modeFiber laserGHz rep-rateUltrafastYtterbium lasersArticle10.1016/j.optcom.2015.12.064