飞秒强激光脉冲的腔外压缩实验研究
文献类型：学位论文
| 作者 | 朱毅 |
| 学位类别 | 硕士 |
| 答辩日期 | 2005 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 李儒新 |
| 关键词 | 飞秒激光 脉冲压缩 块状介质 光谱展宽 色散补偿 |
| 其他题名 | Experiments on extra-cavity compression of intense femtosecond laser pulses |
| 中文摘要 | 近20年来，随着锁模技术和cPA（惆啾脉冲发大）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sfs的超短激光脉冲；而目前最高的激光峰值功率己经达到了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。一方面，台式化激光器的可聚焦功率密度已经达到了1022w／cm2量级，在如此强的电磁场作用下，光与物质的相互作用进入了极端非线性甚至相对论领域，由此产生的一系列新的物理现象如固体高次谐波，激光粒子加速，台式核聚变等等都已经或正在成为国际研究的热点；另一方面，激光输出的短至飞秒量级的脉冲已经作为超快探针在激光化学等领域取得了令人瞩目的成果。以上各种物理现象的探究，大都基于台式化，小型化的飞秒强激光装置。然而，目前常用的钦宝石激光振荡器和放大器系统，由于工作物质的增益窄化效应的限制，其直接输出脉冲宽度都在20fs以上。为了得到更短的输出脉冲宽度和更高的脉冲峰值功率，将激光器输出的脉冲进行进一步的压缩成为了目前普遍采用的技术。为了得到用于高次谐波阿秒脉冲驱动源的超短超强激光装置，我们对飞秒强激光脉冲的腔外压缩技术进行了实验研究。论文的工作主要集中在以下几个方面：1．研究了利用块状材料展宽激光脉冲光谱的压缩方式。利用激光在块状材料中传输时的非线性效应展宽激光光谱，然后补偿脉冲携带的正啁啾，从而达到压缩脉冲的目的。2．研究了飞秒脉冲激光在惰性气体（Ar，Kr）中传输后的成丝和超宽光谱产生现象。得到了利用成丝效应展宽光谱方案的光谱数据，为以后利用啁啾镜补偿色散的压缩方法做了前期的实验准备。 |
| 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 ultraintense and ultrashort laser pulse will lead people to a brand-new ultrafast high intensity research field. On the one hand, the focused laser intensity of table top laser facilities has been as high as 1022W/cm2, the laser-matter interaction will came into extreme nonlinear area or even relativistic area under such high intensity, a series of new physical phenomena such as high harmonics generation (HHG) form solids, laser particle acceleration, table-top laser fusion et al have attracted many international researchers' interest; On the other hand, the femtosecond laser pulses exiting the laser oscillator have played the role as a ultrafast probe, and people have made considerable achievements in laser chemistry by using this probe. The research fields mentioned above are all based on compact high intensity short pulse laser facilities. Due to the gain narrowing effect of the Ti: sapphire, the pulse duration after amplification is still limited to the level of 20fs. In order to get shorter output pulse duration and higher output power, the compression of the laser pulse exciting the laser amplifier has been widely adopted. In order to get the intense femtosecond laser driver for the attosecond pulse generation, we have experimentally investigated the extra cavity pulse compression technology. The main contents of this thesis are listed below: Pulse compression by using bulk media has been experimentally investigated. The method of spectrum broadening in nonlinear material and dispersion compensation by prisms pair is employed. The filamentation and superconntinuum generation have been experimentally investigated by focusing high intensity femtosecond laser pulse into noble gas (Ar, Kr). The broadened spectrum we have observed will be the valuable data for subsequent pulse compression by using chirped mirrors. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16516]  |
| 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 | 朱毅. 飞秒强激光脉冲的腔外压缩实验研究[D]. 中国科学院上海光学精密机械研究所. 2005. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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