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Study correlation vortices in the near-field of partially coherent vortex beams diffracted by an aperture

Chinese Physics B 2010年第10期19卷 251-257页

作者：李建龙 College of Physics Science and Technology Sichuan University

We have derived the analytical expression of the electric cross-spectral density in the near- field of partially coherent vortex beams diffracted by an aperture. Taking the Caussian Schell-model vortex beam as a typical example of partially coherent vortex beams, the spatial correlation properties and correlation vortices in the near-field of partially coherent vortex beams diffracted by a rectangle aperture are studied. It is shown that the off-axis displacement, spatial degree of coherence parameter, propagation distance, and the opening factor of the aperture affect the spectral degree of coherence and positions of correlation vortices. With the optimization algorithm, we obtain the symmetric distributing coherent vortex.

关键词： spatial correlation property correlation vortex aperture diffraction near-field

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Spectral anomalies and spectral switches of partially coherent and polychromatic light diffracted at an aperture

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Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 24-35页

作者： Lü Baida1, 3 & PAN Liuzhan1, 2 1. Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China 2. Department of Physics, Luoyang Normal College, Luoyang 471022, China 3. State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China Correspondence should be addressed to L Baida (email: badalu@***) Received July 10, 2003 Institute of Laser Physics and Chemistry Sichuan University Chengdu China State Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan China Department of Physics Luoyang Normal College Luoyang China

Based on the propagation theory of partially coherent light in the space-frequency domain, the anomalous spectral behavior and spectral switches in the far field of partially coherent and polychromatic light diffracted at an aperture are studied. It is shown that, as compared with spatially fully coherent and polychromatic light whose spectral anomalies are induced only by aperture diffraction, the spectral anomalies and spectral switches of partially coherent and polychromatic light depend on the aperture diffraction, spatial correlationβ and bandwidth of the original spectrum. Detailed numerical calculations are made to illustrate the behavior of spectral switches of partially coherent and polychromatic light, and the results for spatially fully coherent and polychromatic light are treated as a special case ofβ=1 and included in our theory.

关键词： spectral anomaly spectral switch partially coherent and polychromatic light far field aperture diffraction

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Anomalous spectral behaviour of diffracted chirped Gaussian pulses in the. near field

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Chinese Physics B 2004年第5期13卷 637-645页

作者：潘留占吕百达 DepartmentofPhysics LuoyangNormalCollegeLuoyang471022China InstituteofLaserPhysics&Chemistry SichuanUniversityChengdu610064China

By using the Fourier transform method, analytical expressions for the axial power spectrum and near-field intensity in the spacetime domain of chirped Gaussian pulses diffracted at an aperture are derived, which permit us to study changes in spectral and temporal profiles of the chirped Gaussian pulses both analytically and numerically. Detailed numerical results and physical analysis show that spectral anomalies take place in the neighbourhood of certain critical distances, and the shifting of maximum and splitting of temporal intensity profiles appear. In particular, for ultrashort chirped pulses, there exists also spectral switch. Besides the truncation parameter, the chirp parameter and pulse duration affect the behaviour of spectral switches.

关键词： spectral anomaly spectral switch chirped Gaussian pulse aperture diffraction

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