Spectral Line-by-Line Pulse Shaping

谱线逐行脉冲成形安德鲁·韦纳，普渡大学，0601692知识优势：锁模激光器产生超短脉冲的周期性序列，这些脉冲在频域中由一系列均匀间隔的离散谱线表征。近年来，这种光学频率梳的稳定导致了无线电频率与光学频率之间的直接和精确联系，并在精密光学频率合成和测量方面取得了巨大进展。与此同时，利用光谱成分的频域操纵来合成用户指定的超短脉冲场的脉冲整形技术也得到了发展和广泛应用。到目前为止，锁模激光器的频率稳定和锁模激光器的频域操纵和整形都是分开研究的。因此，一个新的研究计划是计划在高分辨率脉冲成形器分辨和控制单个谱线。设想的研究包括在逐行状态下的脉冲成形研究，重点是逐行操作产生的新现象；演示适用于逐行脉冲整形的波形表征方法；开发具有非常高分辨率（GHz范围）的新型脉冲成形器几何形状，同时缩放到数千条线的操作；梳状源的研究提供了更多的谱线，同时保持良好的光频率稳定性在一个参数范围内适合于光通信的应用。更广泛的影响：对单个谱线的操纵的计划研究预计将导致超快光学的一个根本的新制度，其中脉冲整形和稳定频率梳的属性和优势可以同时实现并首次被利用。光脉冲整形和飞秒频率梳技术各自都产生了巨大的影响。将它们结合起来，将在安全光通信、雷达和无线通信的超宽带电波形生成、化学反应和量子力学运动的相干控制、单周期脉冲生成和光谱学等领域带来新的机遇。由于这些技术具有广泛的可行性，因此可能还会出现尚未预料到的其他应用程序。该项目还应在一个领先的研究小组的氛围中，为尖端技术领域的广泛学生培训提供丰富的机会，该研究小组在研究生培训方面的卓越表现通过学生获奖的良好记录得到证明。提案预算中包括两名博士生。这些学生将有机会设计、实现和测试新的光脉冲整形和频率梳模块，并进行整合这些先进技术的实验，报告他们的发现，并在适当的会议场所与其他研究人员互动。

Spectral Line-by-Line Pulse ShapingAndrew Weiner, Purdue University0601692Intellectual Merit: Mode-locked lasers generate periodic trains of ultrashort pulses that are characterized in the frequency domain by an evenly spaced series of discrete spectral lines. Recently, the stabilization of such optical frequency combs has led to a direct and precise connection between frequencies spanning radio-frequency to optical and to enormous progress in precision optical frequency synthesis and metrology. In parallel, pulse shaping techniques that exploit frequency domain manipulation of optical spectral components for synthesis of user-specified ultrashort pulsed fields have been developed and widely adopted. Until now frequency stabilization of mode-locked lasers and frequency domain manipulation and shaping of such lasers have been considered separately. Therefore, a new research program is planned in which high resolution pulse shapers resolve and control individual spectral lines. The envisioned research includes investigation of pulse shaping in the line-by-line regime, with an emphasis on new phenomena arising from line-by-line manipulation; demonstration of waveform characterization methods appropriate for line-by-line pulse shaping; development of novel pulse shaper geometries capable of very high resolution (GHz range) while scaling to manipulation of thousands of lines; and investigation of comb sources providing increased numbers of spectral lines while maintaining good optical frequency stability in a parameter range suitable for applications in optical telecommunications.Broader Impacts: The planned research on manipulation of individual spectral lines is expected to lead to a fundamentally new regime in ultrafast optics in which the attributes and advantages of pulse shaping and of stabilized frequency combs can be simultaneously realized and exploited for the first time. Both optical pulse shaping and femtosecond frequency combs technologies have individually had tremendous impact. Combining them should result in new opportunities in areas such as secure optical communications, ultrawideband electrical waveform generation for radar and wireless communications, coherent control of chemical reactions and quantum mechanical motions, single cycle pulse generation, and spectroscopy. Because these technologies are broadly enabling, it is likely that additional applications as yet unanticipated will also emerge. This project should also provide rich opportunities for broad student training in areas of cutting-edge technology, within the atmosphere of a leading research group whose excellence in graduate student training is evidenced through a strong record of student awards. Two Ph.D. students are included in the proposal budget. These students will have the opportunity to design, implement, and test novel optical pulse shaping and frequency comb modules and perform experiments integrating these advanced technologies, as well as report their findings and interact with other researchers at appropriate conference venues.