权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Stability of an efficient optical parametric chirped pulse amplification

高效光学参量啁啾脉冲放大的稳定性

基本信息

批准号：
15560029
负责人：
HARIMOTO Tetsuo
金额：
$ 1.92万
依托单位：
University of Yamanashi
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Optical parametric chirped pulse amplification (OPCPA) is one of possible technologies to produce an ultrahigh power laser with a compact size, a high pulse contrast, and a large spectral bandwidth. The OPCPA is generally divided into two geometries to achieve the large bandwidth phase-match : a near-collinear geometry that the nonlinear optical process is closed-to-degeneracy and a noncollinear geometry that the amplification process is away from degeneracy. Based on these two geometries, some novel ideas for the OPCPA were proposed to replace conventional regenerative or rod disk amplifiers. For the collinear geometry, the OPCPA process can be evaluated with one-dimensional coupled wave-equation. Also with one-dimensional calculations, angular effects of beam divergences and beam quality were discussed by introducing the angular effects into the phase-mismatching factor, in which the frequency chirp of the signal pulse was ignored in that analysis. For the noncollinear geometry, spat … More ial effects should be considered and evaluated by introducing the walk-off angle and transverse displacement into multi-dimensional coupled wave-equations.We developed a multi-dimensional simulation code of coupled wave-equations for optical parametric chirped pulse amplification involving effects of frequency chirp, beam divergence, walk-off, group-velocity mismatch, and diffraction. Based on a conventional noncollinear geometry, we show some typical numerical results, such as spatially shaped effect in signal beam due to the spatial separation between pump and signal beams, and central wavelength shift effect in the signal pulse due to the walk-off and beam divergence.We propose a novel scheme for ultra-broadband phase-matching optical parametric chirped pulse amplification with an angularly-diverged pump beam. This scheme has some advantages such as an ultra-broadband phase-matching range, a stable amplification for signal beam and a stable pulse compression subsequently, and a simple experimental configuration. The proposed scheme is expected to amplify a signal pulse shorter than 10 fs around an 800-nm wavelength. Less

光参量啁啾脉冲放大（OPCPA）技术是实现小尺寸、高对比度、大光谱带宽、高功率激光器的可能技术之一。为了实现大带宽的相位匹配，OPCPA通常分为两种结构：非线性光学过程接近简并的近共线结构和放大过程远离简并的非共线结构。基于这两种结构，提出了一些新的想法，OPCPA取代传统的再生或棒盘放大器。对于共线几何，OPCPA过程可以用一维耦合波方程来计算。在一维计算的基础上，通过将角度效应引入相位失配因子中，忽略信号脉冲的频率啁啾，讨论了角度效应对光束发散角和光束质量的影响。对于非共线几何体， ...更多信息在多维耦合波方程中引入离散角和横向位移，考虑了啁啾效应，建立了一个包含频率啁啾、光束发散角、离散角、群速度失配和衍射效应的多维耦合波方程模拟程序.基于传统的非共线结构，我们给出了一些典型的数值结果，如抽运光与信号光的空间分离对信号光的空间整形效应，以及抽运光的走离和发散对信号光中心波长的偏移效应，提出了一种利用抽运光角发散实现超宽带相位匹配光参量啁啾脉冲放大的新方案.该方案具有超宽带相位匹配范围、信号光稳定放大和脉冲压缩、实验结构简单等优点。所提出的方案预计将放大信号脉冲短于10 fs左右的800 nm波长。少