气体和固体透明材料中飞秒四波混频的实验研究
文献类型：学位论文
| 作者 | 刘奇福 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 刘军 |
| 关键词 | 四波混频 深紫外 飞秒激光 多色飞秒激光 |
| 其他题名 | Investigations of Femtosecond Four-wave Mixing in Gas and Transparent Solid Material |
| 中文摘要 | 超强超短飞秒激光脉冲为光化学、光物理学和光生物学等学科领域提供了前所未有的极端物理条件和实验手段。一方面，随着飞秒超短激光脉冲在光化学、光物理学和光生物学等研究领域应用的深入与拓展，对飞秒激光脉冲的要求越来越高。基于现有的商用飞秒激光器，采用四波混频方法来拓展飞秒激光的波长范围，获得更长和更短波长的超短飞秒激光的研究是飞秒激光技术领域的一个热点。另一方面，随着飞秒激光光谱学和飞秒非线性光学显微成像的发展，越来越多的实验研究需要同时用到多个不同频率的飞秒激光脉冲。因此研究在固体透明光学介质中级联四波混频获得超宽带多色飞秒激光脉冲是非常必要的。 本论文取得的主要研究成果如下： 基于非简并四波混频方法，在现有实验条件下，将输出激光波长拓展到了深紫外波段。据此，我们搭建了一套采用800nm钛宝石激光输出的基频光与其倍频光在光丝中四波混频的实验装置，获得了光谱半高全宽约为10nm，支持傅里叶转换极限脉宽为10fs，单脉冲能量约为4μJ的深紫外飞秒激光脉冲。 搭建了800nm波段的空芯光纤激光脉冲压缩系统。当入射激光脉冲中心波长为800nm、光谱范围为775-830nm时，经过充有一个大气压氩气的空芯光纤，实验上将入射激光光谱范围展宽为630-900nm。 设计了一套非常简单紧凑的多色飞秒激光产生的实验系统装置，当入射激光脉冲为充气空芯光纤展宽的飞秒激光脉冲的时候，我们在一片0.5mm厚的CaF2晶体中利用级联四波混频方法，获得了单脉冲能量在60nJ以上，光谱半高全宽近100nm，支持转换极限脉宽小于10fs的超宽带多色飞秒激光脉冲。 脉宽约为25fs的脉冲激光直接入射到上述最新设计的多色飞秒激光产生实验装置时候，在0.15mm厚的白宝石晶体中级联四波混频，获得了单脉冲能量高达2.6μJ的目前最高能量的多色飞秒激光脉冲。 |
| 英文摘要 | Ultrashort femtosecond laser pulses provide unprecedented extreme physical conditions and experimental tools for photochemistry,photobiology and optical physics.On the one hand,with the expanding applications of femtosecond laser pulses in photochemistry,photobiology and optical physics,different kinds of femtosecond laser pulses have become increasingly demanded.It is a hot research field to get longer and shorter wavelengths of ultrashort femtosecond laser pulses by using femtosecond four-wave mixing method.On the other hand,with the development of femtosecond laser spectroscopy and femtosecond nonlinear optical microscopy imaging,more and more experimental studies need to simultaneously use multiple femtosecond laser pulses at different frequencies.Therefore,it is necessary to obtain ultra-wideband multi-color femtosecond laser pulses by using the cascade four-wave mixing in solid transparent optical medium. The main results of this paper can be summarized as follows: We built a four-wave mixing experimental device by using a hollow fiber or filamentation system.Based on the non-degenerate four-wave mixing method in a filamentation,the output of the laser wavelength is expanded to deep ultraviolet. The deep ultraviolet femtosecond pulse obtained have about 4μJ pulse energy and about 10 nm at FWMH that can support Fourier transform limit pulse width of 10fs. We set up a hollow fiber laser compression system at 800 nm.The incident laser pulses at 800nm with a spectral range of 775-830nm have been broadened to the spectral range of 630-900nm after transmitting a hollow fiber filled with argon gas. We designed and set up a simple and compact experimental device for cascaded four-wave mixing.When the incident laser pulses were out from the hollow fiber system,ultra-broadband multicolor femtosecond laser pulses have been obtained on a 0.5-mm-thick CaF2 plate.The pulse energy is about 60nJ, more over its spectral bandwidth at full width half maximum is as broad as 100nm which can support sub-10fs Fourier transform-limited pulse width. When a 25fs laser pulse directly from a Ti:sapphire laser system was incident to the above experimental device, high-energy multicolor femtosecond laser pulses whose single pulse energy is as high as 2.6μJ have been obtained in a 0.15-mm-thick sapphire plate. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16859]  |
| 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 | 刘奇福. 气体和固体透明材料中飞秒四波混频的实验研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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