| 题名 | 超短超强脉冲系统前端的色散控制研究 |
| 作者 | 徐婷婷 |
| 学位类别 | 硕士 |
| 答辩日期 | 2013 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 谢兴龙 |
| 关键词 | 飞秒脉冲 光参量啁啾脉冲放大 棱栅 色散补偿 |
| 其他题名 | Dispersion Compensation for Ultra-short High Power Laser System |
| 中文摘要 | 基于强场物理的发展和快点火的需求，超强超短光脉冲技术成为日前激光发展的大方向之一，其前端系统中的光参量啁啾脉冲放大（OPCPA）技术是产生超短超强光脉冲的关键技术，而实现精确的色散控制则是提高脉冲对比度的必要条件。在光参量啁啾脉冲放大系统中，展宽器和压缩器的不匹配、放大介质和其他光学器件的引入以及传输过程中的非线性效应均有可能给系统带来剩余色散，使压缩后的脉冲对比度显著下降。 本毕业论文的工作主要围绕超短超强脉冲系统前端的色散控制研究展开，在光参量脉冲放大理论的基础上，提出了一种新的色散补偿方法。 本文创新点在于： 1、分析了中心波长800nm、脉宽十fs量级、带宽百nm量级的超短超强激光脉冲在光学参量啁啾脉冲放大中的色散特性； 2、立足于超短超强激光装置的CPA系统，针对宽带啁啾脉冲放大系统的色散特性，为超短超强激光装置的前端系统设计了一种新型的双密度棱栅色散补偿器。提出了运用新型棱栅结构独立补偿三阶色散的技术方案；不同于以往的棱栅结构，此结构中第二块光栅的线密度是第一块的两倍，使得入射光线能够在不使用反射元件的情况下原路返回，达到了消除空间啁啾的效果，同时也避免了反射镜粗糙度引起的光谱相位畸变对输出脉冲的影响；同时，该棱栅为分离式结构，既避免了一体式棱栅的繁杂制作工艺，又便于调节； 3、针对该双密度棱栅色散补偿装置建立了光线追迹模型，通过数值计算讨论了各个结构参数对装置色散补偿量的影响。计算结果表明：通过同时线性调节棱镜对间距和棱镜-光栅间距，该装置可以在补偿系统剩余啁啾量（二阶色散）的基础上，保持补偿的二阶色散量不变（可以为零），独立补偿三阶色散，且补偿量可在较大正负范围内变化。装置可作为一个单独的色散控制器，用于超短超强激光脉冲前端的色散控制。 |
| 英文摘要 | The researches on high field physics and “Fast Ignition” lead to the development and desire of the ultra-short high power laser pulsegeneration. The Optical Parametric Chirped Pulse Amplification (OPCPA) is adopted as the most promising technology for such pulse generation. As the pulse width decreasing, the pulse sprectrum width turn larger and the precise dispersion control play a more and more important role to improve the signal-to-noise ratio (SNR). In OPCPA system, the mismatch of the stretcher and the compressor, non-linear effect of the amplification medium and the introduction of in the transmission materials other optical devices are likely to give a residual dispersion to the pulse, masking the pulse contrast after compression decreased significantly. This thesis focused on dispersion control of the front end in the Ultra-short High intense pulse system and introduced a new method of dispersion compensation on the basis of the theory of optical parametric pulse amplification. The innovations of this thesis are: 1、Analyzed the dispersion characteristics of laser pulses with center wavelength of 800 nm, width of tens of fs, and bandwidth of near 100 nm in optical parametric of the chirp pulse amplification system; 2、Based on the dispersion characteristics of broadband chirp pulse amplification system, a new device for independent third-order dispersion compensation of ultra-short laser pulses is developed; Unlike traditional grism-pair devices, this setup is made up of a pair of double-line-density grisms. It is featured that the density of the second grating doubles the first one so the pulse can transfer back along the input routine without a mirror, which will avoid effect of space chirp, and also prevent phase distortion of the output pulse caused by the mirror. Each grism consists of a prism and a grating separated from each other ,which makes it easy to fabricate and easy to adjust; 3、Created a ray tracing model and analyzed the influence of structural parameter to the amount of dispersion compensation introduced by the device through numerical calculation. The numerical results of ray tracing show that this setup can compensate third-order dispersion independently without any spatial distortion, and the compensation sphere covers a wide scale from negative to positive. It should be valuable for dispersion compensation of femto-second pulse in chirped-pulse amplification systems. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16773]  |
| 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 | 徐婷婷. 超短超强脉冲系统前端的色散控制研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
| 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。
修改评论