基于OPA的中红外超短激光脉冲产生及测量技术研究
文献类型：学位论文
| 作者 | 陈运 |
| 学位类别 | 硕士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 冷雨欣 |
| 关键词 | 中红外超短激光脉冲 光学参量放大 宽带可调谐 频率分辨光学开关 |
| 其他题名 | Generation and characterization of mid-infrared ultra-short laser pulses based on OPA |
| 中文摘要 | 3-5μm中红外波段是空间大气的一个窗口波段，对大雾、烟尘等具有很强的穿透力。中红外波段不仅包含了众多原子及分子的吸收峰，还对应着很多材料的电子跃迁能级和量子局限半导体的带间跃迁能级。因此该波段的激光在激光物理、激光化学、生物医疗和国家安全等方面都具有极其重要的应用价值和发展前景。由于缺乏合适的增益介质，目前高峰值功率的中红外超短激光技术的发展落后于可见光和近红外波段。发展产生中红外波段可调谐、大能量、高光束质量超短激光脉冲的新技术以及开拓相应的脉宽和相位的精确测量技术，是当前国际上激光技术的重要发展方向之一。 本论文围绕基于光学参量放大（OPA）的中红外超短激光脉冲产生及测量技术展开研究，主要研究成果和创新点如下： 1.创新发展基于共线OPA的中红外超短激光脉冲产生技术，获得了高光束质量、大能量、宽带可调谐的中红外超短激光脉冲。该装置输出的闲频光波长可调谐范围为2.4-4.0μm，最高能量达82μJ在3.27μm，对应的信号光能量为350μJ在1060nm，系统整体能量转换效率达到14.6%。获得的中红外超短激光脉冲具有非常好的能量稳定性及光束质量，测量半个小时的能量抖动性为1.01% rms，基于刀口法测量得到的闲频光光束质量因子为M2～1.7，信号光光束质量因子为M2～1.1。此大能量、宽带可调谐、高光束质量的中红外超短激光脉冲将成为超快光谱学研究和强场物理实验的强有力工具。 2.发展了基于SHG-FROG原理的新波段中红外超短激光脉冲测量技术，并搭建相应的实验装置以及建立了完善的数据分析处理程序。此装置结构简单紧凑，具有0.067fs超高的时间分辨率和133ps的超宽时间测量范围。提出了在时域和频域施加约束条件的猜测脉冲；基于Matlab编写的主元素广义投影算法（PCGPA）程序，成功地实现了中红外超短激光脉冲宽度及相位测量。针对自行搭建的OPA输出的3580nm中红外超短脉冲，FROG算法反演计算的脉宽为122.89fs，对应10.3个光学周期，恢复光谱形状与真实光谱符合一致。并进一步通过插入色散元件进行分析验证，理论计算与实验结果吻合验证了实验装置极高的准确性和可靠性。 |
| 英文摘要 | 3-5 μm mid-infrared spectral region is a window of the space air, and it has a strong penetration in thick fog, smoke and so on. The mid-infrared spectral contains a lot of absorption peak of the atomic and molecular, it also corresponds to the electron transition energy levels of many materials and the interband transition energy levels of quantum confined semiconductor. Therefore, the mid-infrared laser plays an important role in laser physics, laser chemistry, biomedical engineering, national security and so on. Because the lack of suitable gain media, the mid-infrared laser technology of high peak power falls behind the visible and near-infrared field at present. Currently, developing new technique of generation of broadband tunable, high energy and high beam quality ultra-short laser pulse and accurate measurement of duration and phase in the mid-infrared field, is one of the important development directions of laser technology in the world. This thesis mainly focuses on generation based on optical parametric amplification (OPA) and characterization of mid-infrared ultra-short laser pulses, the major results can be summarized as below: 1. We have obtained the high beam quality, high energy and broadband tunable mid-infrared pulse by innovation developed generation of mid-infrared ultra-short laser pulses based on collinear OPA technique. The idler pulses are tunable ranging from 2.4 μm to 4.0 μm with energy up to 82 μJ at 3.27 μm, which corresponds to signal energy of 350 μJ at 1060 nm, and the net energy conversion efficiency reaches 14.6%. The output mid-infrared pulse has a good energy stability with a fluctuation of 1.01% rms over half an hour. The achieved pulses have excellent intensity distribution with measured beam quality factor M2~1.7 for idler and M2~1.1for signal by means of knife-edge method. The high energy, high beam quality and broadband tunable mid-infrared pulse will be a reliable and powerful tool for ultra-fast spectroscopy research and strong-field physics experiments. 2. We have developed characterization technique of mid-infrared ultra-short laser pulses based on second-harmonic-generation frequency-resolved optical gating (SHG FROG) and built a measurement experiment device and completed the program of analysis and process. This simple and compact experiment system has a temporal range of 133 ps with an ultra-high resolution of 0.067 fs. We have proposed an initial guess with constraint both in time and frequency domain in principle components generalized projections algorithm (PCGPA) written in Matlab, which successfully characterized the duration and phase of mid-infrared ultra-short pulse. According to the output mid-infrared ultra-short pulse at 3580 nm from our OPA system, the retrieved pulse by FROG algorithm has a duration of 122.89 fs, corresponding to 10.3 cycles, and there is a good agreement between the retrieved and measured spectrum. We also make a further verification by inserting a dispersion plate, comparing the measured spectral phase difference with the calculated one. The excellent agreement verifies the high accuracy and reliability of the device. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16958]  |
| 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 | 陈运. 基于OPA的中红外超短激光脉冲产生及测量技术研究[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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