powerful pulse
3.We derive an analytic expression of the group velocity dispersion(GVD) induced chirp and the self-phase modulation(SPM) induced chirp in the normal dispersionregion of non -kerr-like optical fibers with saturable nonlinarity.The evolution of chirp is simulated by numerical methods.The studied results show that the more powerful saturable effects,the smaller is chirp and the gently is chirp.The net chirp is zero in the central region of the pulse.
4.If any late -'90s band can claim to have ascended strictly on its own merits,it's Creed,a Florida?bred foursome that went from zero to sixty (or,more accurately,zero to nearly 4x Platinum)by virtue of a combination of finger-on-the-pulse songs and powerful live performances,rather than a raft of hype.
5.The device for air bubble in water was made by ourselves. The different way was used for photography for experiment: source of nature light,weak laser(3mW,He-Ne 632.8nm) and continuous pulse solid powerful laser(200mW,DPSS 532nm),cameras of phoenix 303K,CASIO EX-Z40 CCD for 4.2 million pixel and Nikon D100 CCD 6 million pixel. By photography,the bubble interface was showed distinctly.
