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phase dispersion of Raman and Rayleigh-enhanced four-wave mixings in femtosecond polarization beats

Chinese Physics B 2009年第6期18卷 2340-2351页

作者：赵燕聂志强李昌彪张彦鹏甘琛利郑淮斌李院院卢克清 Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi’an Jiaotong University State Key Laboratory of Transient Optics and Technology Xi’an Institute of Optics and Precision MechanicsChinese Academy of Sciences

Based on color-locking noisy field correlation in three Markovian stochastic models, phase dispersions of the Raman- and Rayleigh-enhanced four-wave mixing （FWM） have been investigated. The phase dispersions are modified by both linewidth and time delay for negative time delay, but only by linewidth for positive time delay. Moreover, the results under narrowband condition are close to the nonmodified nonlinear dispersion and absorption of the material. Homodyne and heterodyne detections of the Raman, the Rayleigh and the mixing femtosecond difference-frequency polarization beats have also been investigated, separately.

关键词： phase dispersion Raman Rayleigh four-wave mixing

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Joint Angle Correction in Rheumatoid Arthritis and Its Reliability Analysis Based on phase dispersion Quantification

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Open Journal of Medical Imaging 2022年第4期12卷 171-179页

作者： Yafei Ou Prasoon Ambalathankandy Ryunosuke Furuya Tamotsu Kamishima Masayuki Ikebe Research Center for Integrated Quantum Electronics Hokkaido University Sapporo Japan Faculty of Health Sciences Hokkaido University Sapporo Japan

Background: Rheumatoid arthritis is a form of autoimmune disease characterized by synovitis that can ultimately cause joint deformities and impaired functioning. The cartilage destruction is one of the most important indicators for diagnosis and treatment of rheumatoid arthritis, and it is radiographically manifested as joint space narrowing. Issue: In the literature, the joint space narrowing progression between a baseline and its follow-up finger joint images can be quantified by using image registration algorithm. We found that the inconsistencies of joint angles may lead to characteristic mismatches and thus severely affect the accuracy of joint space narrowing quantifications. Methods: In this work, we introduce a rotation invariant phase only correlation in joint space narrowing quantification for the joint angle correction. Further, we propose a confidence index to quantify the quantification reliability of phase only correlation based on phase dispersion in phase difference spectrum. Conclusion: In our clinical experiments, the proposed quantification method can effectively overcome and manage the mismatch due to the inconsistency of joint angles. Additionally, the confidence index shows a high consistency with the joint space narrowing progression examinations manually done by a trained radiologist and one radiological technologist.

关键词： Rheumatoid Arthritis Joint Space Narrowing Frequency Domain Analysis Radiology Computer-Aided Diagnosis phase dispersion

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dispersion Analysis and Compensation of Collinear Optical Parametric Chirped Pulse Amplification Systems

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Chinese Physics Letters 2005年第12期22卷 3091-3093页

作者：王乘冷雨欣梁晓燕张春梅赵保真徐至展 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

In an optical parametric chirped pulse amplification （OPCPA） laser system, residual phase dispersion should be compensated as much as possible to shorten the amplified pulses and improve the pulse contrast ratio. Expressions of orders of the induced phases in collinear optical parametric amplification （OPA） processes are presented at the central signal wavelength to depict a c/ear physics picture and to simplify the design of phase compensation. As examples, we simulate two OPCPA systems to compensate for the phases up to the partial fourth-order terms, and obtain flat phase spectra of 200-nm bandwidth at 1064nm and 90-nm at 800nm.

关键词： phase compensation compensated dispersion dispersion phase spectrum phase dispersion Collinear Parametric optical Chirped Pulse Amplification OPCPA phase

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