Simulation of Temporal Waveform Control of Laser Pulse by Frequency Chirping

概要

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Arbitrary temporal waveform control can be achieved by means of amplifier gain control with a chirped laser pulse. In order to simulate precise waveforms of laser pulses, we developed a multilevel simulation code with transitions between each manifold. Using the developed code, we examined the generation of required temporal waveforms for laser fusion experiment. The maximum amount of chirping decreased considerably at low input intensity and large amplifier gain. In the case of the calculation for a specialized laser system (Gekko XII), a tailored pulse shape can be generated with less than 4 nm chirp, using the current modulation technique. Comparing the amplified ptulses with chirping to those without chirping, peak intensity and energy up to peak were 2.34 and 1.41 times higher, while total energy was O.528 times lower. It was indicated that frequency chirping is one of the most promising methods for generating the tailored pulses for future laser fusion experiments.
社団法人応用物理学会の論文
1998-09-15