Magnetostatic-Wave-Based Magneto-Optic Pulse Compression by Control of Phase Mismatching  

作　　者：武保剑 高翔 

机构地区：[1]Key Lab of Broadband Optical Fiber Transmission and Communication Networks (Ministry of Education), University of Electronic Science and Technology of China, Chengdu 610054

出　　处：《Chinese Physics Letters》2008年第11期4006-4008,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 60401007, and the Applied and Basic Research Programme of Sichuan Province （07JY029-089）.

摘　　要：Microwave magnetostatic waves （MSWs） as moving gratings in magneto-optic （MO） film can lead to the Bragg diffraction of guided optical waves （GOWs）. The MO coupling characteristics are responsible for the amplitude and phase frequency spectra of diffrazted pulses and even result in the compression of chirped optical pulses in time domain. We theoretically investigate the noncollinear diffraction of linearly chirped Gaussian optical pulses by continuous magnetostatic forward volume waves in detail. For a given chirped optical pulse, with the increase of phase-mismatching slopes, the compression efficiency （CE） is gradually improved up to the maximum followed by the transition of diffracted pulses from single peak to multi peaks. The larger the chirp parameter is, the smaller the required phase-mismatching slope to achieve the maximal CE is. However, the rise of the chirp parameter or phase-mismatching slope reduces the relative peak intensity of the diffracted pulse. Lastly, it is pointed out that the phase-mismatching slope can be greatly increased by using the high-order modes of MSWs and GOWs.Microwave magnetostatic waves （MSWs） as moving gratings in magneto-optic （MO） film can lead to the Bragg diffraction of guided optical waves （GOWs）. The MO coupling characteristics are responsible for the amplitude and phase frequency spectra of diffrazted pulses and even result in the compression of chirped optical pulses in time domain. We theoretically investigate the noncollinear diffraction of linearly chirped Gaussian optical pulses by continuous magnetostatic forward volume waves in detail. For a given chirped optical pulse, with the increase of phase-mismatching slopes, the compression efficiency （CE） is gradually improved up to the maximum followed by the transition of diffracted pulses from single peak to multi peaks. The larger the chirp parameter is, the smaller the required phase-mismatching slope to achieve the maximal CE is. However, the rise of the chirp parameter or phase-mismatching slope reduces the relative peak intensity of the diffracted pulse. Lastly, it is pointed out that the phase-mismatching slope can be greatly increased by using the high-order modes of MSWs and GOWs.

关 键 词：the power-law exponents PRECIPITATION durative abrupt precipitation change 

分 类 号：O44[理学—电磁学]