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The generation and propagation of sub-picosecond, high-peak-power, laser pulses.

机译：亚皮秒级高峰值功率激光脉冲的产生和传播。

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摘要

In this thesis, various aspects of high-peak-power laser pulses are discussed, including the generation of pulses from a compact directly diode-pumped chirped-pulse-amplification (CPA) laser system, and the self-channeling of high-peak-power laser pulses in air.; With the maturation of CPA laser systems, the amplification of laser pulses to the terawatt level is becoming common. With these pulses, even air acts as a nonlinear media with novel nonlinear effects seen only after a few meters of propagation. Due to self-focusing and self-phase modulation, an initially collimated high-peak-power pulse is shown to spatially collapse into a high-intensity regime, limited in spot size through the generation of a low-density plasma. Through an interplay of self-focusing, natural diffraction, and refraction from the generated plasma, a self-channel can form, leading to the propagation of a high-intensity pulse for distances of over 30 meters, limited by losses experienced during propagation.; In this work, various experiments were performed to characterize the pulse during propagation in the self-channel, includes measurements on the spatial profile, spectral content, and energy contained in the high intensity core. Further, the ability to control the onset of filamentation was shown by changing the initial pulse duration through adjustments of the pulse chirp. Also, results of a numerical model which solves the nonlinear Schrodinger equation including ionization are shown.; In the subsequent part of this thesis, the development of a compact, directly diode-pumped CPA laser system is described. This system produced high-peak-power (100 MW), 450-fs pulses at repetition rates in excess of 1 kHz. This section proceeds from a discussion of semiconductor laser diodes to the development of a diode-pumped Nd:glass modelocked oscillator (characterized by a high-dynamic-range autocorrelator) and regenerative amplifier. As well, based on a rate equation analysis, novel lifetime effects from cw-pumped regenerative amplifiers are shown.; Finally, a discussion of different methods used to achieve better mode-matching from a multimode pump beam is presented. These include the use of highly doped gain media, the use of a lossless spatial filter to reduce the {dollar}Msp2{dollar} value of the diode beam, and matching of the cavity mode to the pump beam through use of an elliptical cavity mode.
机译：本文讨论了高峰值功率激光脉冲的各个方面，包括从紧凑的直接二极管泵浦chi脉冲放大（CPA）激光系统产生脉冲，以及高峰值功率的自通道化在空气中发射激光脉冲。随着CPA激光系统的成熟，将激光脉冲放大到TB级变得很普遍。利用这些脉冲，甚至空气也可以充当非线性介质，并具有新颖的非线性效应，只有在传播几米后才能看到。由于具有自聚焦和自相位调制功能，最初经过准直的高峰值功率脉冲在空间上崩溃为高强度状态，通过生成低密度等离子体限制了光斑大小。通过产生的等离子体的自聚焦，自然衍射和折射的相互作用，可以形成自通道，从而导致高强度脉冲的传播距离超过30米，受传播过程中损耗的限制。在这项工作中，进行了各种实验来表征自信道中传播期间的脉冲，包括对空间轮廓，光谱含量和高强度磁芯中包含的能量的测量。此外，通过调节脉冲线性调频脉冲改变初始脉冲持续时间，显示了控制纤维化开始的能力。并且，示出了求解包括电离的非线性Schrodinger方程的数值模型的结果。在本文的后续部分中，将介绍紧凑型直接二极管泵浦CPA激光器系统的开发。该系统以超过1 kHz的重复频率产生了450 fs的高峰值功率（100 MW）脉冲。本节从对半导体激光二极管的讨论开始，到二极管泵浦Nd：玻璃锁模振荡器（由高动态范围自相关器表征）和再生放大器的开发。同样，基于速率方程分析，显示了连续泵浦再生放大器的新型寿命效应。最后，讨论了用于从多模泵浦光束中实现更好的模式匹配的不同方法。这些措施包括使用高掺杂增益介质，使用无损空间滤波器来减小二极管束的{Msp2 {Msp2} {dollar}值，以及通过使用椭圆腔模将腔模与泵浦束匹配。

著录项

  • 作者

    Braun, Alan Michael.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Physics Optics.; Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 153 p.
  • 总页数 153
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;无线电电子学、电信技术;
  • 关键词

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