Study On Phase Aberration Of The Optics For High Power Solid-state Laser Facility

With the development of the research in ICF (Inertial Confinement Fusion), the output energy of high power solid-state laser facility has increasing rapidly, which offers the man with the foundation to obtain the clear resource. Since the need of the reality, the higher output energy of high power solid-state laser facility is demanded. However, there is tight relationship between the output beam quality and the phase aberration introduced within the high power laser facility, which means that the focusability of output beam, self-focusing and filaments if possible are influenced by the phase aberration directly, so the output energy are affected by the phase aberration as well. Meanwhile, as we known, the optics used in the laser facility is the main source of phase aberration, so the phase aberration introduced by the optics is studied in this work.The followings are the main achievements in this dissertation: 1. According to the mathematic model, how the phase aberration affect the focusability of output beam is illustrated. The different parameters to describe the phase aberration, the different characteristic of the parameters and how to calculate the parameters are introduced respectively, what's more, the correlation between the parameters are given out.2. Four kinds of different methods which are used in the calculation of phase rms gradient are introduced in detail, the characteristic of the different methods are described as well. According to the design principle of Wiener filter, the model is set up. Then the best methods are made out through the theoretical analysis and simulation calculation, those are Quad_flip technique and harming window with adding zero sampling points, then the simulation result is validated through the experiment. What's more, the connection between the number of adding zero sampling points and rms error, and the correlations between the different phase size, different sampling place and the best number of adding zero sampling points are discussed respectively.3. The principle and the essence of low-filter and band-pass filter of the phase aberration that coursed by the high power solid-state laser facility are analyzed in order. The models for low-filter and band-pass filter are established respectively through the combination of Wiener filter's design principle and G-S phase recover algorithm. On this case, the best functions for low-filter and band-pass filter are drawn through the theoretical analysis and simulation calculation. Finally, according to the experiment, the accuracy of the simulation result is validated.