低重复频率啁啾脉冲放大系统的研究
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摘要
近十年来,飞秒激光技术不断发展,台式啁啾脉冲放大系统逐渐成为获得高
    能量脉冲的重要技术手段,并且在许多领域中得到了广泛的应用。而在实际中更
    需要小型化,全固化,性价比高,运转性能稳定的飞秒激光振荡器和放大器。 
     本文在理论和实验上对飞秒激光振荡器以及低重复频率啁啾脉冲放大系统
    进行了深入的研究,主要包括以下几个内容: 
     一、阐述了飞秒激光器及啁啾脉冲放大系统的发展过程和发展趋势以及飞秒
     脉冲激光在诸多方面的应用。 
     二、从掺钛蓝宝石的物理和化学性质出发,详细阐述了自启动飞秒激光器的
     工作原理、自启动机制和小型化设计;着重分析了掺钛蓝宝石振荡器的
     克尔透镜锁模原理;对窄带自启动元件的设计原理和结果进行了分析;
     给出了设计可靠,运转稳定的自启动钛宝石飞秒激光振荡器的各项实验
     参数和最终结果,并分析了该振荡器的稳定性。 
     三、以理论计算为基础,针对本系统对马丁内兹型和欧浮纳型两种展宽器进
     行了优化选择,并确定最终参数。 
     四、设计并完成飞秒激光啁啾脉冲放大系统。采用再生放大和四通放大构成
     的两级放大系统,实现了高能量的飞秒脉冲输出,可维持自启动并且运
     行可靠。
In the past ten years, femtosecond laser technology has made great progress, and
    the tabletop chirped pulse amplification (CPA) system has become an important
    technique to acquire high-energy femtosecond pulses, which has opened up a wide
    variety of applications in many fields. However, more compact,all-solid-state,
    cost-effective and stable femtosecond oscillators and amplifiers are desired in those
    applications.
     This dissertation presents a deep study of the laser oscillator and the
    low-repetition-rate chirped pulse amplifier system, both theoretically and
    experimentally. The main contents of this thesis are as follows:
     1. The development, progress in femosecond laser technology and the CPA
     system as well as the applications of femosecond laser pulses in many
     fields were included.
     2. On the basis of the physical and chemical characteristics of Ti: Sapphire,
     the principles, self-starting mechanism and compact design of the
     femtosecond oscillator were explained in detail. The Kerr-lens
     mode-locking mechanism was analyzed following a discussion of the
     principles of various mode-locking mechanisms. The design and results
     of narrow-band SESAM were discussed. The structure and output
     parameters of a stable self-starting oscillator were shown. And the
     stability of our oscillator was also analyzed.
     3. Based on the theoretical calculation, an optimal choice between the
     Martinez stretcher and the Offner stretcher was made for our special
     system.
     4. A low-repetition-rate CPA system was designed, which consisted of a
     regenerative amplifier and a four-pass amplifier, which operated stably
     and could self-start.
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