1996- 1999, under the guidance of my tutor, academician and researcher Gu, I studied for my doctorate in the Institute of Physics, Chinese Academy of Sciences, and carried out the application research of fractional Fourier transform in the field of optical information processing. Combining fractional Fourier transform with Yang-Gu algorithm, beam shaping is realized in fractional Fourier transform domain. A new structure to realize Radon-Wigner display is proposed. A series of new transformations, such as fractional Gabor transformation, are proposed. An optical correlator which can realize rotation invariance and translation variation is proposed. The concept of self-fractional hankel function is put forward and its properties are studied. Optical fractional Fourier transform and its application in the field of optical information have been well received by peer experts. Mu Guoguang, former chairman of chinese optical society and academician of Nankai University, commented on this work: "This achievement has innovative academic significance and potential application prospects, and has won unanimous praise from domestic and foreign peer experts and been cited many times. Related content has formed an important new branch of modern information processing, and it is an outstanding achievement in the research work of modern optical technology and science in China, with international advanced level. " During this period, he also engaged in the research of nonlinear optical superlattice design, extended the concept of periodically polarized lithium niobate design from quasi-periodic to aperiodic, and proposed corresponding optimization design methods, which were applied to second harmonic generation, third harmonic generation and parametric oscillation, providing a new way for the generation of new frequencies. The experimental results verify the correctness of the theory. 1999-200 1 engaged in biological imaging research in the faculty of engineering, Yamagata University, Japan, with the support of the postdoctoral fund of Japan Learning Promotion Association. Various methods to improve the resolution of optical coherence tomography are proposed. The main works are published on Opt. Ritter has attracted the attention of international colleagues and has been applied to practical instruments.
From 200 1 to 2002, I was engaged in the research of optical fiber gas sensor in the Department of Electronic Engineering of Hong Kong Polytechnic University. A high-sensitivity optical fiber gas sensor is proposed by combining the laser intracavity spectrometer with optical fiber, and the sensitivity is improved by 100 times. A variety of multiplexing methods are proposed, which promotes the application of optical fiber intracavity sensor. This part has been published as a chapter in the book "New Progress of Optical Fiber Sensing Technology" published by Science Press. In 2002-2003, he was a Humboldt researcher at the Institute of Applied Optics of the University of Stuttgart, Germany. With the support of the Humboldt Foundation of Germany, he was engaged in the research of digital holographic reconstruction algorithm, and put forward a new scheme of digital holographic reconstruction using phase recovery algorithm, which attracted the attention and affirmation of his peers. This part has been published by Nova science press as a chapter in the new book "New Development of Laser and Electro-optic Research". Since 2003, he has worked in the Physics Department of Capital Normal University. They have been funded by Beijing Science and Technology Rising Star Program, Beijing Overseas Students Optimization Fund and other talent programs. As a core member of Beijing "Terahertz Spectrum and Imaging" innovation team, he is mainly engaged in the design and research of Terahertz Spectrum and Imaging, Terahertz band surface plasmon optics and micro-nano optoelectronic devices. In terahertz imaging, many terahertz imaging methods, such as multi-wavelength imaging, polarization imaging and real-time tomography, have been proposed, and many papers have been included in virtual journals in terahertz field. In 2007 and 2009, he visited Leicester University of Technology and Konstanz University in Germany respectively. During the above research, He * * * participated in writing 3 monographs, applied for 3 patents, and published more than 30 scientific papers 12, among which more than 80 papers were included in SCI, and 22 papers with impact factor above 3.5 were cited by others for more than 5 10 times, with H index12.