逐脉冲可编程的超快光波形合成
Pulse-by-pulse programmable synthesis of ultrafast optical waveforms
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中文总结 AI 辅助
本文提出一种基于FPGA驱动的电光调制与时间4f整形系统的逐脉冲可编程整形器，在约20兆赫兹重复频率下实现光谱-时间控制，并展示了零阶、一阶及分数阶相位编程能力，为超快光学任意波形合成提供了新途径。
中文摘要 AI 辅助
在高重复频率（通常为兆赫兹）超快脉冲序列中对单个脉冲进行可编程控制，是光学任意波形合成的长期目标。在此，我们报道了一种可编程的逐脉冲整形器，能够在约20兆赫兹的重复频率下实现对超快脉冲的确定性光谱-时间控制。通过在时间4f整形系统中，对拉伸波形施加由FPGA驱动的电光调制同步，该方案将依赖于脉冲索引的光谱相位分布写入单个脉冲。我们展示了三个层次的可编程能力：零阶相位编码，将逐脉冲相位序列映射为类似双缝的光谱-时间干涉；一阶相位编程，产生具有确定性延迟的任意时间轨迹；以及分数阶相位工程，生成可编程的时间呼吸。通过将整形后的脉冲序列注入非线性光纤级，编程的时间呼吸被转换为光谱呼吸。我们进一步构建了非线性光谱呼吸的相位级依赖图谱，揭示了从弱的单包络呼吸到多峰光谱分裂以及强呼吸合并光谱动力学的转变，与数值模拟一致。该逐脉冲光谱-时间合成平台将脉冲索引确立为超快脉冲整形的可编程自由度，并为实时、脉冲分辨的光学任意波形合成提供了途径。
英文摘要
Programmable control of individual pulses in a high-repetition-rate (typically MHz) ultrafast pulse train is a long-standing goal for optical arbitrary waveform synthesis. Here, we report a programmable pulse-by-pulse shaper that enables deterministic spectral-temporal control of ultrafast pulses at a repetition rate of $\sim$ 20~MHz. By synchronizing an FPGA-driven electro-optic modulation on the stretched waveform in a temporal 4$f$ shaping system, the regime writes pulse-index-dependent spectral phase profiles onto individual pulses. We demonstrate three levels of programmable ability: zero-order phase coding that maps pulse-by-pulse phase sequences into double-slit-like spectral-temporal interference; first-order phase programming that produces arbitrary temporal trajectories with deterministic delay; and fractional-order phase engineering that generates programmable temporal breathing. By launching the shaped pulse train into a nonlinear fiber stage, the programmed temporal breathing is converted into one spectral breathing. We further construct a phase-level-dependent regime map of nonlinear spectral breathing, revealing transitions from weak single-envelope breathing to multi-peak spectral splitting and strongly breathing merged-spectrum dynamics, in agreement with numerical simulations. This pulse-by-pulse spectral-temporal synthesis platform establishes pulse index as a programmable degree of freedom for ultrafast pulse shaping and provides a route toward real-time and pulse resolved optical arbitary waveform synthesis.
发表机构
- East China Normal University（华东师范大学）
- Chongqing Institute of East China Normal University（华东师范大学重庆研究院）
- Polytechnique Montréal（蒙特利尔高等理工学院）
- University of New Mexico（新墨西哥大学）
机构由 AI 辅助整理，请以论文原文为准。
