Abstract
A monitoring and compensation system which is built for an amplifier that can generate flat-top laser beam is described.The amplifier uses a multi-level amplification structure.It can output 5 J energy of a single pulse,and the spot size of the flat-top laser beam is 50 mm×50 mm.The liquid-crystal valve in the amplifier can modulate energy distribution of the output spot effectively.The monitoring system is combined with the spatial filter in the amplifier,and by the theory of Fourier-image transfer,it can image energy distribution of the liquid-crystal valve on the monitoring CCD.The compensation system effectively improves the quality of the output laser beam by feeding back the output spot of the amplifier on the liquid-crystal valve.Experimental result shows that energy distribution of the shaped beam is more uniform,and the near-field modulation of the flat-top laser beam generated by the amplifier is 1.64,the softening factor is 0.053.The beam-quality control and improvement are well realized by the monitoring and compensation structure.
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