| 题名 | 飞秒激光脉冲的载波包络相位（CEP）测量的实验研究 |
| 作者 | 王之光 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 曾志男 |
| 关键词 | 飞秒激光 载波包络相位 Gouy相位移动 超连续谱 |
| 其他题名 | Experiments on the measurement of the Carrier-envelope Phase of femtosecond laser pulses |
| 中文摘要 | 近20年来，随着锁模技术和CPA(啁啾脉冲发大)技术的发展和完善，人类获得了前所未有的超短超强激光条件。目前，激光振荡器已经可以直接输出短于5fs的超短激光脉冲；而目前最高的激光峰值功率已经达到了PW量级。如此短的脉冲和如此高的功率将人类带入了一个崭新的强场超快物理领域。 当由超短红外泵浦脉冲的非线性频率转换以及超连续辐射的傅立叶合成而产生出紫外/极紫外亚飞秒激光脉冲时，“阿秒”（1阿秒＝ 秒）这个词才正式进入物理学的字典里。由于受激拉曼散射和高次谐波产生的辐射涵盖了从可见光到紫外/极紫外的光谱范围，因此阿秒激光物理学主要基于这些非线性、非微扰的激光与原子相互作用。然而，对于阿秒脉冲的产生起着至关重要作用的一个要素就是载波包络相位的控制。载波包络相位这个之前一直被人们忽视的参数，现在在与电场振幅相关的非线性过程当中变得至关重要。目前，测量以及控制载波包络相位较为通用的方法即所谓的f-to-2f光谱干涉测量法。 基频光首先被展宽到一个倍频程，之后探测基频光与倍频光的拍频信号。这项技术本身要求非常精密，并且需要尖端技术的仪器支持。 为了能够更好的控制载波包络相位，我们研究了由本实验室自主搭建的激光放大以及压缩系统的载波包络相位漂移。论文的工作主要集中在以下几个方面： 1． 利用自主搭建的共线f-to-2f干涉仪测量激光放大以及压缩系统的载波包络相位漂移。为了能够将这种测量方法应用在高能量的激光系统中，我们将通常用来获得超连续谱的光子晶体光纤替换为白宝石片。 2． 利用超连续谱干涉的方法测量Gouy相位移动。我们提出了一种简单的方法，利用两束白光连续谱的光谱干涉测量飞秒激光脉冲的焦点附近的Gouy相位移动。 |
| 英文摘要 | Over the past decades, substantial progress has been achieved in femtosecond laser technology. With the invention of laser self mode-locking and chirped pulse amplification technology, it has been possible to generate ultra-short and ultra-intense laser pulse by table-top laser system with the pulse duration and intensity never reached before. Nowadays, people can get laser pulse shorter than 5fs directly from a femtosecond laser oscillator. The peak power of the laser pulse can reach the PW level. Such an ultra-intense and ultra-short laser pulse will lead people to a brand-new ultra-fast high intensity research field. The word “attosecond” (1 as = s) officially entered the vocabulary of physics when sub-femtosecond pulses of UV/XUV light produced either by nonlinear frequency conversion of a ultra-short infrared pump pulse or Fourier synthesis of broad bandwidth radiation were established. The physics of these pulses is based on nonlinear, nonperturbative laser–atom interaction: stimulated Raman scattering or high harmonic generation (HHG) is used to generate the necessary bandwidth, which naturally encompasses the visible and UV/XUV spectral range. However, the crucial element for attosecond pulse generation is the control of the Carrier-envelope phase (CEP). This phase, which is normally ignored, becomes crucial in the case of nonlinear processes that depend on the amplitude of the electric field. Now, controlling the CEP has always been achieved by using the so-called f-to-2f interferometry. The phase stabilization works by broadening the pulse by a full octave and then detecting the beat frequency between the frequency-doubled and the spectrally-broadened components. The technique is delicate and requires state-of-the-art equipment. In order to make further control the CEP, we have investigated the CEP shift of our Laser amplifier system. The main contents of this thesis are listed below: 1. Research on the measurement of the CEP in the Laser amplifier system using the collinear f-to-2f interferometer. In order to adopt this interferometer in higher energy laser system, we obtained the supercontinuum spectrum by sapphire plate as the substitution of the photonic crystal fiber. 2. Research on the measurement of Gouy Phase Shift by using of supercontinuum spectral interference. We present a simple method of the spectral interference between two white-light continuum spectrums to measure the Gouy phase shift of the focused femtosecond laser pulses. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16626]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 王之光. 飞秒激光脉冲的载波包络相位（CEP）测量的实验研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
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