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Femtosecond pulse measurement with intensity interference of coherent and incoherent light

利用相干光和非相干光的强度干涉进行飞秒脉冲测量

基本信息

批准号：
09640488
负责人：
MATSUOKA Masahiro
金额：
$ 2.62万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640488/
关键词：
Intensity interference Two-photon interference Femtosecond pulse incoherent light X-ray region X線パルス

项目摘要

In the present research the authors discussed if the pulse envelope measurement would be possible by an intensity interference when the output photo-currents from the two detectors were digitized and multiplied. This idea was motivated as an extension of the previous two-photon interference measurements [1] of pulse envelopes of the author, where coincidence photon counting were employed instead of the photo-current detection.The result showed that this system could measure only the coherence time of the pulse not the pulse envelope. This is natural, if we consider that we are measuring the Young's interference.However, if we consider that the coherence time here is defined as1/tau^2_*1/tau'^2_+1/tau^2_ tau_c tau_p,we see that if one make the correlation time tau'_c longer than the pulse width tau_p, one can measure the latter. If this is possible, this would be a great advance, since can be separately measured from tau_c. Previously, they were measured only in combination. This method would be applicable to wide wavelength ranges even to the X-ray region.

在本研究中，作者讨论了当两个探测器输出的光电流被数字化并相乘时，是否可以通过强干涉来测量脉冲包络线。这个想法的动机是作为作者之前的脉冲包络双光子干涉测量[1]的扩展，其中使用符合光子计数代替光电流检测。结果表明，该系统只能测量脉冲的相干时间，不能测量脉冲包络线。如果我们考虑到我们正在测量杨氏干涉，这是很自然的。然而，如果我们考虑相干时间在这里被定义为1/tau^2_*1/tau'^2_+1/tau ' 2_ tau_c tau_p，我们看到，如果使相关时间tau'_c长于脉冲宽度tau_p，则可以测量后者。如果这是可能的，这将是一个巨大的进步，因为可以从tau_c单独测量。在此之前，它们只是综合衡量的。这种方法适用于较宽的波长范围，甚至适用于x射线区域。