High-power Solid-state Laser System Wavefront Correction Technology To Optimize The Study

How to improve the output energy and beam quality were two most noteworthy problems in the building of high power solid-state laser facility. The multi-pass amplifier was being adopted proverbially, which could improve the output energy consumedly. But on the other hand the beam quality was degraded by the severe wave-front's aberration that exacerbated by multi-passing the beam through the amplifier. To ensure the beam quality reach the requirement of high efficiency third harmonic conversion and small focal spot size, the correction of wave-front aberration had to be considered in the design of high power solid-state laser facility. The wave-front correct system should be designed according to the wave-front aberration's characters of optic system. So how to use the wave-front correct technology reasonably became one of the most important problems. Concerned this problem, the following questions were investigated in this paper:1. The relationship between wave-front aberration and focal spot size was researched roundly, and the essential connection between focal spot energy shape and wave front gradient distribution was discovered, and a smarter parameter to evaluate wave front aberration was founded. Based on this, the wave front aberration tolerance confined by focal spot size requirement was obtained through calculation and statistics method.2. The wave-front aberration's cumulating of optics elements in multi-pass amplifying system was researched more deeply. Considering the correlation between optics elements' wave-front aberrations caused by the similar fabrication technique, the correlation coefficient was adopted to revise calculation rule of superimposition which used in estimating system's static wave-front aberration and allocating optical machining precision.3. The measuring of multi-pass amplifying facility's wave-front aberration was achieved, and the character of wave-front aberration in such high power solid-state laser facility was mastered primarily, then the requirement for wave correct system was found out more clearly which would provide support for high power solid-state facility's optimum design.4. The structure and character of deformable mirror were analyzed, and the conflict between the deformation band and the pitch of deformable cells was pointedout. The "two-time compensation" wave-front correct mode was introduced to settle that conflict. The method for allocating wave-front aberration and designing static corrector was found, and the "two-time compensation" wave-front correct mode was validated by simulation.5. Otherwise, the applicability of cube comer array in the wide spectrum high power solid-state laser facility was researched as a relatively absolute part in this paper. Through simulation, the action of cube corner array to reduce beam's focal spot size was testified visibly, and the smoothing effect of beam's modulation caused by cube corner array was proved primarily on the wide spectrum condition.