title: Nonlinear spectrum broadening of femtosecond laser pulses in photorefractive waveguide arrays.
abstract: In photorefractive waveguide arrays, the process and extent of spectral broadening of femtosecond laser pulse caused by self-phase modulation are studied theoretically and experimentally. The threshold of self-phase modulation is more than two times larger than the common threshold in a bulk sample, which affects the extent of spectral broadening dramatically. The coupling length and the ratio between the common threshold and the input peak intensity of the femtosecond laser pulse are the two key parameters dominating these phenomena. The experimental results confirm the theoretical expectation.
authors.affiliation: The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics, and TEDA Applied Physics School, Nankai University, Tianjin 300457, PR China
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wu
authors.forename: Chengliang
authors.initials: C
authors.lastname: Yang
authors.forename: Xinzheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen
authors.forename: Romano A
authors.initials: RA
authors.lastname: Rupp
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008027:Light; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*