Autonomous pulse shaping method for inertial confinement fusion high power laser facility

Abstract

Abstract Laser pulse shape is one of the most critical parameters for the success of inertial confinement fusion (ICF) experiments. The ability to shape the laser pulse with accuracy, efficiency, and robustness is fundamental to the ICF experiments. An autonomous pulse-shaping method that is universally feasible for ICF facilities with individual characteristics and independent adjustability for each beam has been achieved. This method employs an iterative algorithm and strategies to solve the problem of nonlinear response in the pulse-shaping process, as well as to improve the convergence rate. The test results indicate that it is capable of shaping an almost arbitrary pulse waveform within 5 min and 10 iterations, reaching a convergent accuracy better than 10 % RMS of the deviances. As a result, the precise control on the laser pulse shape and the operational efficiency in ICF facilities are greatly improved.