Sub-cycle Optical Pulse Shaping by Parametric Beating with Adiabatically Prepared Raman Coherence

本项目主要研究亚飞秒脉冲压缩和亚周期脉冲整形。该技术的实质是在单个相干叠加态中绝热制备宏观分子系综。这种制备是通过两个变换受限的纳秒激光脉冲来完成的，这些脉冲与拉曼共振略有失谐。然后施加第三个飞秒激光脉冲，脉冲持续时间比分子周期长几倍。分子运动对这种脉冲进行调制，以产生宽频谱的离散边带，可用于合成一系列短的单周期脉冲。更广泛的影响涉及到对学生的教育和许多潜在的应用。

This project focuses on sub-femtosecond pulse compression and sub-cycle pulse shaping. The essence of the technique is adiabatic preparation of a macroscopic molecular ensemble in a single coherent superposition-state. This preparation is accomplished by two transform-limited nanosecond laser pulses, slightly detuned from the Raman resonance. Then a third, femtosecond laser pulse is applied, with duration a few times longer than the molecular period. Molecular motion modulates this pulse to produce a wide spectrum of discrete sidebands, which can be used to synthesize a short train of single-cycle pulses. The broader impact involves the education of students and numerous potential applications.