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题名	高密度透射式光栅产生飞秒多脉冲的研究
作者	周倩
学位类别	硕士
答辩日期	2012
授予单位	中国科学院上海光学精密机械研究所
导师	周常河
关键词	飞秒激光 高密度透射式光栅 飞秒多脉冲 飞秒脉冲整形
其他题名	Generation of multiple femtosecond pulses by using high-density transmissive gratings
中文摘要	飞秒激光脉冲具有超高的峰值功率和超短的脉冲宽度，在微加工和超快动力学等领域具有很广泛的应用。随着飞秒激光技术的发展，对飞秒激光进行控制也成为了人们竞相研究的热点，特别是飞秒脉冲整形技术。本文主要对利用高密度透射式光栅来产生飞秒激光多脉冲进行了理论研究和实验验证，并在此基础上提出了利用高密度透射式光栅来进行飞秒脉冲的整形。主要工作如下： 1. 利用多个高密度透射式光栅平行放置的结构提出了一种新的飞秒激光多脉冲的产生装置。首先进行了飞秒激光多脉冲产生的理论分析。理论分析的结果表明：通过调节光栅间距可以精确控制各个输出飞秒脉冲间的时间延迟；在垂直于飞秒激光入射方向移动任意光栅四分之一个周期时，可以改变出射飞秒脉冲的个数。其次用实验验证了飞秒激光多脉冲的输出，实验结果由实验室自制的达曼FROG测量。对比迈克尔逊装置，我们的装置具有体积小、结构简单、成本低、操作方便等优点，并且随着光栅个数的增多，装置的效率不会明显的下降。此装置为飞秒多脉冲的产生开辟了新的途径，对飞秒激光的应用具有很大的潜在价值。本研究成果已申请专利（CN102222856A）。 2. 利用高密度透射式光栅来进行飞秒激光脉冲的整形。多个高密度透射式光栅平行放置可以用来产生多个飞秒脉冲，进一步缩小光栅间距，使得输出的飞秒激光脉冲不能完全分开，则会相互叠加，从而形成新的波前输出。通过改变光栅间距，精确控制脉冲间的时间延迟；优化光栅参数，掌握各个衍射级次的效率，从而形成任意波形的输出。文章中考虑到光栅厚度的影响，又进一步改进了装置。随着光栅的设计与制作技术的改进，这种新的飞秒脉冲整形方法具有很大的潜在价值。研究成果已申请专利(201110436129.3)。
英文摘要	A femtosecond laser pulse is characterized by ultrahigh peak power and ultrashort pulse duration and can be widely used in field of micromachining and ultrafast dynamics. With the rapid development of the femtosecond laser technique, control of the femtosecond laser is attracting increasing interest. In this thesis, theoretical and experimental research on generation of multiple femtosecond pulses by using high-density transmissive gratings is presented. Femtosecond optical pulse shaping by using high-density transmissive gratings is also proposed. The content of this work mainly includes: 1. A novel and simple device to generate multiple femtosecond pulses by using multiple high-density transmissive gratings is proposed. First of all, a theoretical analysis is given, which indicates that the time delays among pulses can be controlled precisely by adjusting the distances among gratings and the number of output femtosecond pulses would be decreased as any grating is shifted a quarter of grating’s period in the direction perpendicular to the incident laser. Then the output of four laser pulses has been achieved and the experimental result is measured by a home-made Dammann FROG apparatus. The efficiency of the device will not be decreased a lot if more gratings are stacked. This device has the advantages of compact volume, simple structure, low cost and convenience of manipulation. This structure provides an interesting approach for the generation of multiple femtosecond pulses, which opens a new way for practical applications of the femtosecond laser. This work has applied for a Chinese invention patent (CN102222856A). 2. This device is used for femtosecond pulse shaping, and the theoretical simulation is described. When the distance between two arbitrary gratings is short enough, the pulses from the two gratings will not separate from each other. Therefore, these pulses will overlap and form a new pulse. The time delays among pulses can be controlled precisely by adjusting the transverse distances among gratings. The pulse amplitudes can be modified by controlling the diffraction efficiency of the gratings, which is realized by optimizing the parameters of the gratings. Therefore, femtosecond pulses with any kind of waveform can be obtained. Influence of grating thickness on the shaping of femtosecond pulses is also discussed. With the improvement of design and fabrication technology of the gratings, this high-density transmissive-grating based structure has great potential in optical pulse shaping. This work has applied for a Chinese invention patent (201110436129.3).
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16706]
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	周倩. 高密度透射式光栅产生飞秒多脉冲的研究[D]. 中国科学院上海光学精密机械研究所. 2012.

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