尚光网 本站首页 本所首页 联系我们
chi20191127上海光机所冷雨欣557638Ultra-intense and ultra-short laser is one of the important research frontiers in laser science and technology. By using the optical parametric amplification (OPA) process in the nonlinear crystals instead of the process of particle inversion in the laser gain medium, it is possible to overcome the problems of limited gain bandwidth and severe thermal effect in the traditional amplifier. This technology is expected to develop broadband, new band, tunable ultra-intense and ultra-short laser with higher peak power. The short-pulse pumped OPA has a wider phase matching bandwidth and is capable of supporting shorter pulses. At the same time, short-pulse pumped OPA can significantly improve the picosecond-level temporal contrast. These advantages make it one of the research hotspots. The short-pulse OPA process puts forward higher demands on the temporal width, energy level, and beam quality of the pump laser. Therefore, the development of high energy, high power and high quality pump sources with high repetition for short-pulse OPA have great academic significance and application value. This paper is based on the development demand of short pulse OPA, aiming to develop high-energy, high-power and high-quality short-pulse OPA pump sources, and specifically developed sub-ns, 10ps and sub-ps pump laser systems. The main innovations and research results of this paper are summarized as follows: 1. We develop a sub-ns OPA pump laser system with high energy, which is based on the structure of master oscillator power amplifier (MOPA). With multiple well-designed amplification systems, high-energy, sub-ns laser amplification system is achieved with tunable pulse width. The thermal lens and the thermally induced birefringence effect in the solid-state materials are theoretically analyzed and compensated reasonably. Soft-edge pupil and image-delay system are applied to actively modulate the laser beam quality. Furthermore, with nonlinear second-hormonic generation, high-energy pump laser is obtained with central wavelength of 532nm, pulse energy of 136mJ, frequency of 100Hz and tunable pulse width from 500ps to 3ns. 2. We develop a high-energy OPA pump system aimed at 10ps level. A volume Bragg grating (VBG) is applied in the regenerative amplifier to repeatedly modulate the spectrum of amplified laser pulse and achieve active control of the pulse width. In the end, we obtain high-energy pump laser output with pulse width of 50ps, pulse energy of 316mJ and repetition of 100Hz. 3. In view of the demand of ultra-intense and ultra-short OPA system with few-cycle and short-pulse laser, we develop the research on sub-ps, high-flux Nd:Glass chirped pulse amplification technology. With limited-size grating and research layout, we put forward the novel active multipass stretching system and obtain chirped pulse output with pulse width of 10ns. At the same time, the stretching ratio can be controlled and modulated. And a laser amplifier is introduced in the stretching system to achieve the stretching and amplifying simultaneously. On the basis of long-pulse output, pulse energy can also reach mJ level. With compression demonstration, a compressed 450fs laser pulse is obtained.2020atalunwen2212313747851ultra-short laser; laser amplification; solid-state laser; frequency converting; laser-diode-pumped laserResearch on high-power pump laser for short-pulse optical parametric amplification高功率短脉冲OPA泵浦源技术研究超强超短激光是当前激光科学领域的重要研究前沿之一。利用非线性晶体中的光学参量放大(Optical Parametric Amplification,OPA)过程代替激光增益介质中的粒子数反转的放大过程,可以克服传统能级型放大器增益带宽受限、热效应严重等问题,有望发展宽带、新波段、可调谐、乃至更高峰值功率的超强超短激光。由于短脉冲泵浦的OPA过程具有更宽的相位匹配带宽以支持更短的脉冲输出,并能显著提升皮秒域时间对比度,因此成为当前的研究热点之一。而短脉冲OPA过程对于泵浦激光的时间宽度、能量水平、光束质量等都提出了很高的要求,因此发展大能量、高功率、高性能的重频短脉冲OPA泵浦源具有重要的学术意义和应用价值。 本论文以短脉冲OPA的发展需求为牵引,相应发展了亚纳秒、10皮秒,乃至亚皮秒脉宽下,大能量、高功率、高性能的重频短脉冲OPA泵浦源。主要创新点和研究成果如下: 1. 发展了亚纳秒量级大能量OPA泵浦源。基于主振荡-功率放大的结构,设计了多级放大系统,实现了亚纳秒脉宽可调的大能量脉冲激光放大输出。其中针对固体增益介质中的热致双折射和热透镜效应的产生机理以及补偿手段进行了理论分析和实验论证;引入软边光阑和像传递系统等手段实现了对泵浦激光光束质量的有效控制。进一步通过非线性晶体倍频,获得了脉冲宽度500ps至3ns可调、中心波长532nm的136mJ、重频100Hz大能量亚纳秒激光输出。 2. 发展了10皮秒量级大能量OPA泵浦源。在再生放大器中应用了体布拉格光栅结构,对放大脉冲激光光谱进行多次调制,实现对激光脉冲宽度的主动调节。最终在1064nm波段获得了脉冲宽度50ps级、能量316mJ,重频100Hz的大能量泵浦激光输出。该泵浦激光已应用于中红外OPCPA系统。 3. 面向周期量级短脉冲OPA超强超短激光的需求,开展了亚皮秒、高通量钕玻璃啁啾脉冲放大技术研究。提出并发展了新型有源多程展宽技术,利用有限尺寸的光学元器件和实验平台实现了脉冲宽度10ns的啁啾脉冲输出,并能够实现展宽量的主动控制可调节。同时在传统展宽器结构中引入激光增益模块,在展宽的同时实现激光脉冲的放大,最终在获得长脉冲的基础上实现了mJ量级的能量输出,并进一步通过压缩实验获得了450fs脉冲宽度的输出。超短脉冲激光;激光放大;固体激光;谐波转换;半导体激光泵浦中国科学院上海光学精密机械研究所苏泓澎光学博士
中文题目: 高功率短脉冲OPA泵浦源技术研究
外文题目: Research on high-power pump laser for short-pulse optical parametric amplification
作者: 苏泓澎
导师姓名: 冷雨欣
学位授予机构: 中国科学院上海光学精密机械研究所
答辩时间: 20191127
中文关键词:
超短脉冲激光;激光放大;固体激光;谐波转换;半导体激光泵浦
英文关键词:
ultra-short laser; laser amplification; solid-state laser; frequency converting; laser-diode-pumped laser
中文摘要:
英文摘要:
文献类型:学位论文
学位级别: 博士
正文语种: chi
clickdetails
页面点击量: 4
文章下载量: 1
visitlog
友情链接:
  上海大恒公司
  南京先进激光技术院
  光学产品库

版权所有 © 2009 中国科学院上海光学精密机械研究所 沪ICP备05015387号-18
主办:中国科学院上海光学精密机械研究所 上海市嘉定区清河路390号(201800)