Evaluation of laser pulse propagation in plusma during the bubble regime by high intense laser-plusma interaction

Summary form only given. During the recent experiments and PIC simulations, quasi- monoenergetic for electron is observed. Forming the free of cold plasma electrons cavity behind the laser pulse is possible instead of periodic plasma wave and plasma channel guided method. In this bubble cavity a dense bunch of relativistic electrons with a monoenergetic spectrum is self-generated. The profiles and PIC simulation show the bubble shape cavity behind the laser pulse. In this work we discuss about laser pulse propagation in plasma during the bubble cavity regime. Laser pulse width is calculated in the mentioned regime in this paper. In this work we show in bubble regime, the laser pulse propagates many Rayleigh lengths in the homogeneous plasma without a significant diffraction. These features are absent in the ordinary regime of laser wake field acceleration.