时域超短脉冲光栅记录和读取的研究

为实现超短脉冲信号的重现或整形,从理论上推导了时域超短脉冲光栅的记录和读取,并结合高斯型脉冲分布,讨论了信号脉冲、参考脉冲和读出脉冲宽度不同时的衍射结果,提出了利用超短脉冲全息实现超短脉冲信号的重现或整形等功能的方法.结果发现,长信号脉冲和短参考脉冲干涉记录全息后,如果用足够短的脉冲读取,衍射完全再现了原输入信号脉冲.但是在读出脉冲带宽接近于信号带宽时,衍射波频谱宽度有一定程度减小.

Study on Writing and Reading of the Volume Grating by Time Domain Ultra-Short Pulse

In order to realize the reconstruction or the shaping of the ultra-short pulse,the writing and reading of the volume grating by ultra-short pulse in time domain are theoretically analyzed,and when pulse widths of signal wave,reference wave and reading light are different,the diffraction spectrum under Gaussian profile.Holography is put forward to realize the reconstruction or the shaping of the ultra-short pulse.It can be found that:when writing the holography with long signal pulse and short reference pulse,the signal pulse can be reconstructed totally if the reading pulse is short enough;while the width of diffraction spectrum decreases if the width of reading pulse approaches that of signal pulse.