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题名	中红外激光脉冲及其在单阿秒脉冲产生中的应用研究
作者	吴劲松
文献子类	硕士
导师	曾志男
关键词	光参量放大器 optical parametric amplifier 周期性晶体 periodic crystal 载波-包络相位 carrier-envelope phase 单阿秒脉冲 isolated attosecond pulse
其他题名	Research on Mid-infrared Laser Pulses and Their Application in Isolated Attosecond Pulse Generation
英文摘要	随着超强超短激光技术的发展，激光脉冲的波长正在从钛宝石800nm波长往更短和更长的方向拓展，以应用于更广泛的研究中。光参量放大器(Optical parametric amplifier, OPA)作为一种重要的中红外超强超短激光脉冲光源产生方案，拓宽了激光脉冲的光谱范围。本文研究了光参量放大过程的特点，设计并部分搭建了基于不同非线性晶体的不同波长的OPA，提出了一种周期性晶体，以及提出了一种基于中红外激光脉冲的单阿秒脉冲产生方案。 本论文的工作包括四个部分，主要的结果和创新点如下： （1）模拟了硒化镓(GaSe)晶体中的光参量放大过程，设计了用GaSe作为非线性晶体的可调谐的OPA。该OPA的闲置光波长为10~16μm，对于延伸高次谐波(High-order harmonic generation, HHG)的光谱范围，产生keV光子能量的X射线光谱非常重要。 （2）理论上提出并研究了一种周期性的晶体结构。这种周期性晶体可以极大地简化常规的多级OPA的结构，并将信号光的峰值功率密度提高60%，能量转化率提高1.5倍。通过简化OPA系统结构，有可能大幅度提高多波长混合系统的稳定性。 （3）设计并部分搭建了用偏硼酸钡(Barium metaborate, BBO)作为非线性晶体的三级OPA和两级OPA的多波长混合系统。其中三级OPA的闲置光波长为2μm，信号光波长为为1.33μm，两级OPA的闲置光波长为1.7μm，信号光波长为1.5μm。他们的信号光可以通过非线性差频(Difference frequency generation, DFG)产生10μm左右的长波长脉冲。 （4）基于中红外超强超短激光脉冲，理论上提出并研究了一种对驱动激光脉冲的载波-包络相位(Carrier-envelope phase, CEP)稳定性的依赖性大大降低的单阿秒脉冲(Isolate attosecond pulse, IAP)产生方案。通过使用双色反向旋转圆偏振(Two-color counter-rotating circularly polarized, TC-CRCP)激光脉冲，IAP能在较大范围的CEP值下产生。; As the development of ultrastrong and ultrashort laser technology, to be more widely used in research, the wavelengths of laser pulses are being extended from 800nm of Ti:sapphire lasers to shorter and longer spectral range. Optical parametric amplifiers (OPA), as very important sources of ultrastrong and ultrashort laser pulses in mid-infrared (MIR), broaden the spectral range of laser pulses. In this work, the characteristics of optical parametric amplification are investigated; OPAs at different wavelengths using different nonlinear crystals are designed and partially built; a periodic crystal structure is proposed and studied; a scheme for generating isolated attosecond pulses using MIR laser pulses is investigated. The work of this thesis includes four parts. The main results and innovation points are listed as follows: (1)The optical parametric amplification in gallium selenide is simulated and a tunable OPA employing gallium selenide as nonlinear crystal is designed. The wavelength of the idler is 10~16μm, which is of great importance for broadening the spectral range of high-order harmonic generation (HHG) and generating x-ray with photon energy at the magnitude of keV. (2)A periodic crystal structure is theoretically proposed and investigated. It can largely simplify conventional multi-stage OPAs and increase the idler’s intensity by about 60% and the energy conversion efficiency by about 1.5 times. The simplified configuration of OPA has the potential to largely improve the stability of multi-wavelength systems. (3)A multi-wavelength system which includes a three-stage OPA and a two-stage OPA employing barium metaborate (BBO) as nonlinear crystal are designed and partially built. The wavelengths of the signal and the idler in the three-stage OPA are 1.33μm and 2μm, respectively, while the wavelengths of the signal and the idler in the two-stage OPA are 1.5μm and 1.7μm, respectively. Their signals can be used to generate pulses at long wavelength, about 10μm, through difference frequency generation (DFG). (4) A scheme for generating isolated attosecond pulses (IAP) using MIR ultrastrong and ultrashort laser pulses with largely reduced dependence on carrier-envelope phase (CEP) stability of driving lasers is proposed and theoretically investigated. By employing two-color counter-rotating circularly polarized (TC-CRCP) driving laser field, IAP can be generated in a large range of CEP.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30996]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	吴劲松. 中红外激光脉冲及其在单阿秒脉冲产生中的应用研究[D].

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