Evolution of spatial modulation of broadband laser pulses with different pulse durations in medium with non-instantaneous Kerr nonlinearity |
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| Authors: | Lifu Zhang Xiquan Fu Jianqin Deng Shuangchun Wen Dianyan Fan |
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| Institution: | a Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and School of Information Science and Engineering, Hunan University, Changsha 410082, Chinab School of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China |
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| Abstract: | We experimentally investigate the evolution of spatial modulation of broadband laser pulses with different pulse durations through a medium with non-instantaneous Kerr nonlinearity. By modifying the input laser pulse width, we observe the nonlinear growth of the spatial stripes that arise from interference with different modulation frequencies, and then obtain the gain spectra of the spatial modulation which clearly reveal the influence of relaxation effect on spatiotemporal modulation instability. We find that all gain spectra have the similar fastest growing frequency, but they have tails at higher frequency region in which the growth rate of gain is bigger for shorter pulse duration. The experimental results are confirmed by the perturbational analysis. |
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| Keywords: | Broadband laser pulses Modulation instability Non-instantaneous Kerr nonlinearity |
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