Space-time profiles of shaped ultrafast optical waveforms
Space-time profiles of shaped ultrafast optical waveforms
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DOI：
10.1109/3.481933
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发表时间：
1996
影响因子：
2.5
通讯作者：
M. M. Wefers-M.;K. Nelson
中科院分区：
文献类型：
--
作者：
M. M. Wefers-M.;K. Nelson
推导了空间分离频率成分滤波整形超快光波形的时空分布。给出了单次和两次通过脉冲整形装置时空时脉冲响应函数的封闭形式表达式。对于单次通过和短的未成形脉冲，掩模滤波器的衍射引起期望的电场分布中的平移空间偏移，该平移空间偏移沿成形波形随时间沿着线性变化。该结果是完全通用的，并且适用于使用连续或离散掩模滤波器的频域脉冲整形。它还表明，双通过的设备一般不扭转这种效果，而是引入进一步的时空耦合，如随时间变化的光斑尺寸。具体的掩模图案的例子，并讨论了高保真形状的光波形的产生的影响。
A derivation of the space-time profiles of ultrafast optical waveforms shaped by filtering of spatially separated frequency components is presented. Closed form expressions for the space-time impulse response functions are given for the cases of single and double passes through a pulse shaping apparatus. For a single pass and a short unshaped pulse, diffraction by the mask filter gives rise to a translational spatial shift in the desired electric field profile that varies linearly with time along the shaped waveform. This result is completely general, and applies to frequency-domain pulse shaping with either continuous or discrete mask filters. It is also shown that double passing the apparatus does not generally reverse this effect but rather introduces further space-time coupling such as a time-varying spotsize. Examples of specific mask patterns are presented and implications for the generation of high-fidelity shaped optical waveforms are discussed.