title: Generation and evolution of quadratic dark spatial solitons using the wavefront modulation method.
abstract: We study the evolution of dark spatial solitons by chi((2)): chi((2)) cascaded nonlinearity. The generation and evolution of solitons pairs by the optical branching effect is investigated. It is shown that the number of solitons pairs and the transverse velocity of a given pair depend on the parameters of the input beam. We also investigate the hollows generated in a beam with a uniform background when the two sides of the input beam have various phase difference. It is concluded that dark spatial solitons by chi((2)): chi((2)) cascaded nonlinearity have analog performance compared with that in chi((3)) defocusing Kerr media.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.forename: Feiyu
authors.initials: F
authors.lastname: Wang
authors.forename: Yuping
authors.initials: Y
authors.lastname: Chen
authors.forename: Yuxing
authors.initials: Y
authors.lastname: Xia