基于空间相位阵列调制的同步相移飞秒脉冲数字全息技术研究

项目名称： 基于空间相位阵列调制的同步相移飞秒脉冲数字全息技术研究

项目编号： No.61205014

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 朱林伟

作者单位： 鲁东大学

项目金额： 25万元

中文摘要： 超短脉冲数字全息已经成为研究探测超快动态过程的有力工具。离轴记录的脉冲数字全息，可以很好的消除再现物波的零级和共轭像，但是由于超短脉冲存在低相干性的问题，大大降低了再现物体的成像分辨率和视场。同轴记录的脉冲数字全息可以解决超短脉冲的低相干性，但是同轴数字全息需要先后记录多幅不同相移的全息图来消除零级和共轭像。因此，同轴相移数字全息不适用于动态过程的记录和再现。本项目拟采用空间相位阵列调制的参考光来实现同轴相移数字全息的同步记录，克服同轴相移数字全息无法用于超快动态监测的局限性。通过利用周期性阵列物体在分数泰伯距离处的纯相位衍射分布，实现参考光的空间相位阵列调制。同时集成反射式的迈克尔逊干涉记录与透射式的马赫-泽德干涉记录装置，实现反射和透射方向的实时记录与再现。结合泵浦-探测技术实现飞秒量级的超高速同步相移数字全息实时探测技术，为飞秒时间分辨超快探测、表征的研究提供重要的理论和技术支持。

中文关键词： 脉冲数字全息；泰伯效应；相移；飞秒激光；时间分辨

英文摘要： Ultrashort pulsed digital holography has become a very powerful tool in the field of recording and reconstructing ultrafast dynamic process. Off-axis pulsed digital holography can primarily eliminate the zero order diffraction and the conjugate image. However, the shortness of the low coherent in the ultrashort pulse gives rise to degrading resolution and a limited field of view of the reconstruction images. The low coherent in the ultrashort pulse can be well eliminated by using in-line digital holography. Nevertheless, phase-shifting in-line methods require sequential acquisition. Therefore they are not well adapted to recording and reconstructing the dynamic process. This project will be carried out the parallel phase-shifting in-line digital holography by using the spatial phased array modulated reference wave. This method can well overcome the limit of the general phase-shifting digital holography which can not be used in the ultrafast dynamic measurement. In this project, we study the fractional Talbot effect of different periodic array objects. The spatial phased array modulation distribution is obtained at the fractional Talbot distance of the periodic object. This property of the fractional Talbot effect can be used to achieve the phased array modulation of the reference wave. In addition, a reflection

英文关键词： pulsed digital holography；Talbot effect；phase shift；femtosecond laser；time resolution