title: Five-order SRSs and supercontinuum generation from a tapered tellurite microstructured fiber with longitudinally varying dispersion.
abstract: We try to obtain stable supercontinuum (SC) generation with broad bandwidth under relative simple pump conditions. We use a 1.3-m-long highly nonlinear tellurite microstructured fiber and pump it by a 15 ps 1064 nm fiber laser. One segment of the fiber is tapered from a core diameter of 3.4 μm to 1.3 μm. For the first time five-order stimulated Raman scatterings (SRSs) are observed for soft glass fibers. SC covering 730-1700 nm is demonstrated with the pump-pulse-energy of several nJ. The mechanisms of SC broadening are mainly SRS, self-phase modulation (SPM) and cross phase modulation (XPM). The tapered segment has two advantages. Firstly it increases the nonlinearity of fiber by several times. Secondly, it acts as a compensation for the dispersion of the untapered segment, and mitigates the walk-off between pump pulse and SRS peaks.
authors.affiliation: Research Center for Advanced Photon Technology, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan. liaomeisong2005@yahoo.com.cn
authors.forename: Meisong
authors.initials: M
authors.lastname: Liao
authors.forename: Xin
authors.initials: X
authors.lastname: Yan
authors.forename: Weiqing
authors.initials: W
authors.lastname: Gao
authors.forename: Zhongchao
authors.initials: Z
authors.lastname: Duan
authors.forename: Guanshi
authors.initials: G
authors.lastname: Qin
authors.forename: Takenobu
authors.initials: T
authors.lastname: Suzuki
authors.forename: Yasutake
authors.initials: Y
authors.lastname: Ohishi