Research On The Generation And Linear Propagation Of High Power Finite Energy Airy Beams

Finite energy Airy beams(FEAB)have peculiar characteristics:diffraction-free,self-accelerating and self-healing,therefore they have great potential values in many optical applications,such as optical particle manipulation,light bullets,high-intensity curved plasma channel generations and electron acceleration.But these optical applications are expected for high power FEAB.So how to produce high power FEAB is very important.Generation of high power FEAB needs high power source laser beams.The nonlinear phase or B-integral definitely exists when the power of laser system is high.However,previous researches have not analyzed the effects of nonlinear phase on the generation and linear propagation of the high power FEAB.Based on this conception,the work is mainly as follows:Firstly,the generation of high power FEAB is investigated,and that the nonlinear phase how to affect the generation and propagation of high power FEAB is studied.Research results show:The nonlinear phase is associated with the B-integral of the high power laser system.The nonlinear phase significantly changes the peak intensity and the beam shape during the generation high power FEAB.The variation becomes larger with increasing B-integral,and the bigger truncation coefficient of FEAB,the smaller B-integral domain.In linear propagation,the nonlinear phase increases the acceleration and makes the centroid position of the FEAB move along straight lines,while the variance of RMS(root mean square)width is quadratic in propagation distance.Secondly,according to the Rayleigh range of Gaussian beam,approximation diffraction-free range based on main lobe of high power FEAB is defined.The relation of approximation diffraction-free propagation distance,B-integral and truncation coefficient has been analyzed.Also based on main lobe of FEAB,the effects of truncation coefficient and B-integral on the PIB(power in the bucket)is studied.The results show that when truncation coefficient is small(close to 0),diffraction-free range approaches infinity.Diffraction-free range decreases with increasing of truncation coefficient,but PIB increases with truncation coefficient.When the truncation coefficient is fixed,approximation diffraction-free range and PIB are negatively related to the B-integral.