A new suggestion that there is a phase jump of p in the boundary wave is put forward in this paper. This suggestion may be a supplement of Huygens –Fresnel principle. Based on this new suggestion, a series of new beam was invented, both outside and inside laser cavity. Especially, a new CO2 laser with equivalent beam quality factor Me2 <1 is achieved. It can be considered as the result of some controllable nonlinear self –focusing.