Scalogram Measurement System of Ultrashort Optical Pulse Using Femtosecond Pulse Laser

本研究的目的是发展一种能直接同时测量和分析超短光脉冲作为尺度图的时间、空间和时间频率之间关系的新的光学方法，并设计和构造一种能实现这种尺度图的超快测量和分析的新的光学系统。我们设计并构造了一个新的光学系统，它能够利用小波变换实现多分辨率分析。在该系统中，光学实现了超短脉冲的小波变换，并通过电子后计算实现了各种信号轮廓的检索。为了验证该系统的测量能力，我们进行了多次实验，实验结果表明，该系统可以测量飞秒超短脉冲的尺度图。为了证明所构建的系统的能力，我们获得了几个多分辨率尺度图，改变时间分辨率或光谱分辨率。从本研究的结果中，我们可以得到重要的知识，开发的系统将工作作为一个超快速处理器的尺度图，将是有用的工具，用于测量和分析超短光脉冲。

The object of this research is to develop the new optical method that can directly and simultaneously measure and analyze the relation among time, space and temporal frequency of ultrashort optical pulse as a scalogram, and to design and construct a new optical system capable of realizing such ultrafast measurement and analysis of scalogram.For this purpose, we designed and constructed a new optical system which was able to achieve multi-resolutional analysis by using wavelet transform. In the developed system, wavelet transform of an ultrashort pulse is optically achieved, and retrieval of profiles of various signals is attained with electronic post calculation. To verify the ability of the developed system, we attempted several experiments.Through experimental results, we confirmed that the proposed system can measure scalogram of an femtosecond ultrashort pulse. To demonstrate the capability of the constructed system, we acquire several multi-resolutional scalograms, changing either temporal resolution or spectral one. From the results of this research, we can obtain the important knowledge that the developed system would work as an ultrafast processor for scalogram and would be useful tool for measurement and analysis of ultrashort optical pulses.