QQ客服 官方微博 反馈留言

题名	大口径钛宝石多通放大器寄生振荡研究
作者	范祖涛
文献子类	硕士
导师	梁晓燕
关键词	大口径钛宝石多通放大器 large aperture Ti: sapphire multi-pass amplifier, transverse parasitic lasing 横向寄生振荡 amplified spontaneous emission 放大自发辐射 ultra-short and ultra-intense laser technology 超短超强激光技术 CPA CPA
其他题名	Parasitic lasing research in large aperture Ti:sapphire multi-pass amplifier
英文摘要	超强超短激光技术为科学研究提供了前所未有的超强电磁场和超高能量密度等极端物理条件，在强场激光物理等基础研究领域以及高能粒子加速等前沿应用方面具有重要意义。由于啁啾脉冲放大（Chirped pulse amplification, CPA）技术具有宽的增益带宽、高能量转化效率、高稳定性以及对泵浦光时域和空间分布要求较低，因此CPA技术被认为是可以进一步提升激光脉冲峰值功率至10 PW甚至更高量级的主要技术路线之一。发生于CPA系统所采用的主要能量增益介质大口径钛宝石晶体内部的寄生振荡效应，是制约CPA系统激光脉冲输出更高单脉冲能量进而达到更高峰值功率的关键因素。本论文基于上海光机所自主搭建的5 PW超强超短激光系统，围绕大口径钛宝石多通放大器寄生振荡问题展开研究，特别对放大自发辐射光谱，寄生振荡光谱，寄生振荡对信号光光谱，信号光输出能量，信号光光斑等进行了研究。本论文主要取得了以下创新成果和研究进展： (1).实验验证了一种寄生振荡的监测方法，该方法可有效监测晶体内横向寄生振荡是否发生且可探测寄生振荡光谱。 (2).实验首次探测到了钛宝石晶体内放大自发辐射向寄生振荡的转化过程。 (3).信号光输出光谱在寄生振荡发生的前后始终不变，寄生振荡对信号光光谱没有影响。 (4).放大自发辐射光谱与信号光光谱有部分重叠；寄生振荡光谱与信号光光谱完全重叠。 (5).钛宝石放大器在输出能量达到最大之前已经发生寄生振荡，寄生振荡作用使输出能量迅速下降。 (6).利用时域双脉冲泵浦的方式成功搭建了150mm口径钛宝石多通放大器，避免了寄生振荡，实现了放大器能量的稳定输出。; Ultra-intense and ultra-short laser technology provide unprecedented extreme physical condition such as ultra-intense electromagnetic field and ultra-high energy density which has great significance in the research of strong field laser physics and the advanced application of high energy particle acceleration. CPA (Chirped pulse amplification) technology has been seen as one of the most important technology roadmap that can make the peak power of laser pulse reach 10 PW level or more, because of its broad gain bandwidth, high energy conversion efficiency, high stability, and low requirement for temporal and spatial characteristics of pump light. Ti:sapphire crystal is the main gain medium in CPA laser system. Transverse parasitic lasing in Ti:sapphire crystal is the critical factor that limit the amplifier’s output energy. Parasitic lasing in large aperture Ti:sapphire multi-pass amplifier has been researched based on the 5 PW ultra-intense and ultra-short laser system constructed by SIOM. The amplified spontaneous emission spectrum, parasitic lasing spectrum, and parasitic lasing’s effect on signal spectrum, output energy and beam profile have been studied. The main achievements and research progress in this paper are listed below: (1).A method used to detect parasitic lasing has been verified, which can make sure whether parasitic lasing has occurred and detect parasitic lasing spectrum. (2).The evolutionary process from amplified spontaneous emission to parasitic lasing has been observed. (3).The signal spectrum does not change before and after parasitic lasing occurs. Parasitic lasing has no effect on signal spectrum. (4).Half of the amplified spontaneous emission spectrum overlaps with signal spectrum; The parasitic lasing spectrum overlaps with signal spectrum exactly. (5).Parasitic lasing has occurred before the peak energy point of the amplified laser pulse. (6).Construct the 150mm aperture Ti: sapphire multi-pass amplifier using temporal dual pulse pump technology, avoid the parasitic lasing, realize stable output.
学科主题	光学
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30924]
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	范祖涛. 大口径钛宝石多通放大器寄生振荡研究[D].

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。