Browsing by Author "Teamir, Tesfay G."
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Item Open Access Generation of 1.2-nJ, 62-fs, chirp-free pulses directly from a Yb-doped fiber oscillator(IEEE, 2016) Teamir, Tesfay G.; İlday, Fatih Ömer1.2-nJ, 62-fs, linear-chirp-free pulses are generated directly from a mode-locked fiber oscillator through optimized interaction of second- and third-order dispersion with self-phase modulation.Item Open Access Influence of pump noise on mode-locked fiber oscillators(OSA, 2015) Teamir, Tesfay G.; Elahi, Parviz; Budunoğlu, İbrahim Levent; Gürel, Kutan; İlday, Fatih ÖmerPump modulation transfer function (MTF), and its dependence on pump power are investigated for all normal dispersion, dispersion managed and soliton-like mode-locked oscillator both in experiment and simulation. We find that cavity losses and pulse instabilities such as multiple pulsing influence noise transfer, strongly.Item Open Access Noise induced creation and annihilation of solitons in dispersion managed fiber oscillators(SPIE, 2017) Teamir, Tesfay G.; İlday, Fatih ÖmerOptical solitons and their interaction with other solitons or with dispersive wave shed by solitons under modulation instabilities or perturbation constitute a versatile experimental and theoretical platform for studying the nature of complex dynamics occurring in laser cavities [1-3] in addition to common physical principles in terms with a range of other nonlinear, non-equilibrium, coupled systems outside of optics. A soliton is energy localization of dissipative structures of electric field which evolves from noise in laser cavities. It is stationary solution of nonlinear Schrödinger equation that balances the effects of chromatic dispersion with nonlinearity during propagation in a medium. Strong pumping in soliton regime drives a laser system in to a multi pulsing self-organized system. Such a system in fiber medium is ubiquitous and always attracts research interest. Multisoliton pulses or soliton bunches generated from different systems through a short and long range interaction due to acoustic waves generated from electrostriction and its perturbation induced refractive index change of the medium by a propagating pulse on the next pulse in the neighborhood [4]. A short range interaction can occur as a result of pulses overlapping, acoustoptic interaction or it can occur when dispersive waves at the tail of pulses interact with a back ground field or with solitons near to its [1, 4, 5].Item Open Access Nonlinear management of fiber oscillator with multiple gain segments(Optical Society of America, 2015) Teamir, Tesfay G.; İlday, F. ÖmerStrong nonlinear effects typically dominate the dynamics of mode-locked fiber oscillators. These effects are simultaneously sources of fascinatingly rich dynamics and a technological limitation. While most approaches involve reduction of the nonlinear effects through larger chirping of the pulses or use of large-mode-area fibers, alternative approaches, such as seeking out new mode-locking regimes [1] or even direct compensation of nonlinear effects [2] have been proposed. However, the latter has not been fully realized experimentally.Item Open Access Nonlinearity management of fiber oscillator with multiple gain segments(IEEE, 2015) Teamir, Tesfay G.; İlday, Fatih ÖmerOscillator with two gain segments is used to manage nonlinearity level and distribution. Results suggest that pulse evolution subject to an effective negative nonlinearity arising from complex interaction of gain filtering, dispersion, SFM and chirp.Item Open Access Nonlinearity management: from fiber oscillators to amplifiers(IEEE, 2016) İlday, Fatih Ömer; Şenel, Ç.; Hamid, R.; Teamir, Tesfay G.; Pavlov, Ihor; Teğin, Uğur; Ergeçen, E.; Elahi, Parviz; Iegorov, R.While the standard approach to performance scaling in fiber lasers seeks to reduce nonlinear effects through chirping or mode scaling, I will review recent progress in a complementary approach, whereby the governing dynamics are meticulously exploited towards achieving superior performance.