Optimization of multi-color laser waveform for high-order harmonic generation

• 作 者: 金成 林启东
• 机 构: Department of Applied Physics,Nanjing University of Science and Technology,J.R.Macdonald Laboratory,
• 出 处: Chinese Physics B
• 发表日期: 2016年09期
• 关键词: waveform harmonic harmonics macroscopic divergence matching breakthrough hollow

With the development of laser technologies,multi-color light-field synthesis with complete amplitude and phase control would make it possible to generate arbitrary optical waveforms.A practical optimization algorithm is needed to generate such a waveform in order to control strong-field processes.We review some recent theoretical works of the optimization of amplitudes and phases of multi-color lasers to modify the single-atom high-order harmonic generation based on genetic algorithm.By choosing different fitness criteria,we demonstrate that:(i) harmonic yields can be enhanced by 10 to 100 times,(ii) harmonic cutoff energy can be substantially extended,(iii) specific harmonic orders can be selectively enhanced,and(iv) single attosecond pulses can be efficiently generated.The possibility of optimizing macroscopic conditions for the improved phase matching and low divergence of high harmonics is also discussed.The waveform control and optimization are expected to be new drivers for the next wave of breakthrough in the strong-field physics in the coming years.

With the development of laser technologies, multi-color light-field synthesis with complete amplitude and phase control would make it possible to generate arbitrary optical waveforms. A Practical optimization algorithm is needed to generate such a waveform in order to control strong-field processes. We review some recent theoretical works of the optimization of amplitudes and phases of multi-color lasers to modify the single-atom high-order harmonic generation based on genetic algorithm.By preferences different fitness criteria, we demonstrate that: (i) be enhanced by 10 to 100 times, (ii) harmonic cutoff energy can be substantially extended, (iii) specific harmonic orders can be selectively enhanced, and (iv) single attosecond pulses can be efficiently generated. the possibility of optimizing macroscopic conditions for the improved phase matching and low divergence of high harmonics is also discussed. waveform control and optimization are expected to be new drivers for the n ext wave of breakthrough in the strong-field physics in the coming years.