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题名	超强超短激光系统中宽带可调谐脉冲放大的应用研究
作者	胡忞远
学位类别	博士
答辩日期	2008
授予单位	中国科学院上海光学精密机械研究所
导师	梁晓燕
关键词	啁啾脉冲放大 光学参量啁啾脉冲放大 准相位匹配 波长调谐 超强超短激光系统
其他题名	Application research on broadband and widely tunable pulse amplification in ultra-intense and ultra-short pulse laser system
中文摘要	超强超短激光的发展，开创了强场激光物理研究的新领域，超强超短激光与物质的相互作用，以及在交叉学科、相关高技术领域中的前沿基础研究等，已经成为当前国际上现代物理学乃至现代科学中一个非常重要的科学前沿领域。当前，超短激光脉冲放大的实现方式主要为啁啾脉冲放大（Chirped Pulse Amplification，CPA）和光学参量啁啾脉冲放大（Optical Parametric Chirped Pulse Amplification，OPCPA）两种方式，其中CPA技术相对成熟，输出性能稳定，OPCPA技术则具有较宽的增益带宽、高增益、高对比度等优点，有着更为强劲的发展潜力。本论文在系统分析两者机制的基础上，利用新型的周期性极化非线性晶体和不同的几何结构，开展了高效宽带OPCPA的理论和实验研究；在应用所需的超宽特定波段进行快速光学参量放大（Optical Parametric Amplification，OPA）调谐的理论和实验研究；并参加了基于CPA技术的拍瓦（1PW＝1015W）级小型化超强超短激光系统的实验研究。主要研究成果如下： 1. 研究了在倾斜周期极化的铌酸锂晶体PPLN中采用半非共线相位匹配方式进行宽带OPA的过程。在合适的参数选取下，可在信号光中心波长为800nm处和1064nm处分别获得121nm和70nm的增益带宽，均可支持小于10fs的超短脉冲放大。 2. 研究了半非共线0类准相位匹配结构下，在周期性极化晶体PPLN中宽带参量放大的增益特性。通过选取合适的极化周期确定适宜的相位匹配条件，并分析了极化角度和温度条件对宽带OPA的增益带宽的影响。 3. 利用周期性极化晶体PPLN，研究了使用准相位匹配技术和非共线几何结构的宽范围高速OPA波长调谐。建立了采用改变非共线夹角方式来进行调谐的实验设计方案。在合适的参数选取下，在1200nm到1400nm的波长宽带范围内可实现快速的调谐，所有的OPA过程都保持着2至3nm的低线宽，增益都大于5×102(a.u.)，并在该200nm的波长范围内保持相当的稳定度。该方案有极佳的调谐性能，并适用于其他晶体，以实现在特定波段上的宽带高速OPA波长调谐。 4. 参加了PW级超强超短激光系统中主放大器在大泵浦能量下获得高增益放大的关键技术以及激光系统的总体集成研究。研究并发展了抑制大口径钛宝石放大器中寄生振荡效应以及激光系统前端与主放大器的光同步控制等相关技术。为实现PW级超强超短激光系统的高效率和高稳定度放大提供了保障。
英文摘要	The development of ultra-intense and ultra-short lasers has created some new fields in ultra-intense laser physics. Ultra-intense laser-matter interaction and frontier base of interdisciplinary fields and related high technologies has become a very important frontier research field in modern physics. For the moment, ultra-intense and ultra-short pulses can be realized by two methods: Chirped Pulse Amplification (CPA) and Optical Parametric Chirped Pulse Amplification (OPCPA). The CPA technique is widely used and the OPCPA technique has proved to be more potential. In this dissertation, based on the systematic analysis of these two methods, some theoretic analyses and experimental researches of highly efficient and broadband OPCPA are carried out with novel periodically poled crystals and phase-matching geometries; Theoretical and experimental investigation on fast and widely tunable OPA during the needed wavelength band; Development of a petawatt level table-top Ti: sapphire amplifier based on CPA scheme. The main work is given as follows: 1. Investigation of broadband OPA by employing periodically poled LiNbO3 with titled grating and semi-noncollinear geometry. Under appropriate conditions, broad gain bandwidth of 121nm at a signal wavelength of 800 nm and 70 nm at 1064 nm can be obtained, amplification of ultra-short pulse of ~10 fs can be supported accordingly. 2. Investigation of gain characteristics of broadband OPA with type-0 QPM geometry in PPLN. We can confirm the optimal phase-matching condition by selecting the appropriate grating period, and the influence of grating period and crystal temperature is analyzed consequently. 3. Fast and widely tunable OPA have been investigated by employing QPM technique and noncollinear geometry in PPLN crystal. A Schematic representation of the experimental setup is build up through noncollinear angle tuning method. Under appropriate conditions, fast OPA tuning can be achieved from wavelength at 1200 nm to 1400 nm, all OPA processes keep narrow linewidths from 2 nm to 3 nm; All gain intensities are more than 5×102(a.u.) and keep quite stable during the wavelength band of 200 nm. Outstanding tuning performance can be achieved by using this scheme, other periodical poled crystals can be analyzed in fixed wavelength band with similar method too. 4. Participated in the integration research of a PW Ti: sapphire ultra-intense and ultra-short laser system and investigation on high gain amplification at high pump fluence in main amplifier. Some original study on parasitic lasing suppression in high gain and timed jittering control between bump and signal pulses are investigated with emphasis. High efficiency and high stability amplification based on CPA scheme has been demonstrated.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15248]
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	胡忞远. 超强超短激光系统中宽带可调谐脉冲放大的应用研究[D]. 中国科学院上海光学精密机械研究所. 2008.

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