)2008,2009,2010,2011 ( أنموذج ( ب ) الخاص بالبحوث لألعوام University of Baghdad College Name Institute of laser for postgraduate studies Department Industrial & Engineering Applications Branch Full Name as written in Passport Hussein Ali Jawad e-mail [email protected], [email protected] Career Research Title Shared or Single Published Journal title Volume Number Assistant Lecturer Lecturer Assistant Professor Spectral width variation of ultrashort laser pulses in monomode optical fibers Shared name HANI JASSIM KBASHI, KAIS A. AL-NAIMEE, ROBERTO BENOCCI, PAOLO CARPEGGIANI, CLAUDIO PEREGO, DIMITRI BATANI Journal of Nonlinear Optical Physics and Materials Single 18 - 3 Page 541 - 552 Year 2009 Abstract Professor Femtosecond laser pulse propagation in monomode optical fibers is demonstrated and investigated numerically (by simulations) and experimentally in this paper. A passively mode locked Nd:glass laser giving a pulse duration of about 200 fsec at 1053 nm wavelength and 120 mW average optical power with 100 MHz repetition rate is used in the experimental work. Numerical simulations are done by solving the nonlinear Schrödinger equation with the aid of Matlab program. The results show that self phase modulation (SPM) leads to compression of the spectral width from 5 nm to 2.1 nm after propagation of different optical powers (34, 43, 86 and 120 mW) in fibers of different length (5, 15, 35 m). The varying optical powers produced a varying phase shift. The output spectral width also changed with the fiber length at a given peak power.