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作者： baida lü, hong ma institute of laser physics and chemistry, sichuan university, chengdu 610064. china

The closed-form expressions for the propagation of elegant Hermite-Gaussian (H-G) beams passing though a first-order ptical ABCD system are derived by means of which a comparative study of the propagation properties of standard and legant H-G beams is performed. Furthermore. the beam propagation factor and/or power in the bucket (PIB) are chosen as ne criteria for characterizing beam quality, and the beam quality of standard and elegant H-G beams is compared. 2000 Elsevier Science B.V. All rights reserved.

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The propagation of complex-argument laguerre-Gaussian beams

The propagation of complex-argument Laguerre-Gaussian beams

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作者： hong ma, baida lü institute of laser physics & chemistry, sichuan university, chengdu 610064. china

The propagation of complex-argument laguerreGaussian (l-G) beams passing through a paraxial optical ABCD system for both unapertured and apertured cases has been studied in detail. The analytical propagation expressions for unapertured case have been derived based on the generalized Huygens-Fresnel diffraction integral. which enable us to calculate the field distribution from one plane to another, For the apertured case numerical calculations are still available. Numerical examples are given to illustrate the propagation properties of complex-argument l-G beams.

关键词： Elegant laguerre-Gaussian beam - propagation equation - unapertured and apertured cases

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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 1. institute of laser physics and chemistry Sichuan University 610064 Chengdu China 2. State Key laboratory of laser Technology Huazhong University of Science and Technology 430074 Wuhan China 3. Department of physics Luoyang Normal College 471022 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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Beam propagation properties of radial laser arrays

Beam propagation properties of radial laser arrays

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作者： baida lü and hong ma institute of laser physics and chemistry. sichuan university, Cengdu 610064. china

A detailed study of phase-locked and non-phase-locked radial laser arrays is presented. The closed-form propagation expressions for the beamlets and the resulting beam are given, which enable us to study beam propagation properties of radial laser arrays for both phase-locked and non-phase-locked cases. Numerical calculation examples are given to illustrate the application of our analytical results and the differences between phase-locked and non-phase-locked radial arrays. 2000 Optical Society of America [S0740-3232(00)01210-2]

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General propagation equation of flattened Gaussian beams

General propagation equation of flattened Gaussian beams

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作者： baida lü and Shirong luo institute of laser physics and chemistry. sichuan university. chengdu 610064. china

The closed-form propagation equation of flattened Gaussian beams passing through a paraxial optical ABCD system, in which the linear gain and absorption media are included, is derived, and its general applicable advantage is illustrated with numerical examples. 2000 Optical Society of America [S0740-3232(00)01310-7]OCIS codes: 350.5500, 050.1940, 140.4480.

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Beam combination of a radial laser array: Hermite-Gaussian model

Beam combination of a radial laser array: Hermite-Gaussian m...

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作者： baida lü, hong ma Deparment of Opto-Electronics. Science and Technology, institute of laser physics and chemistry, sichuan university, chengdu 610064. china

The closed-form beam propagation equations of radial laser array are derived, where the Hermite-Gaussian mode is used to describe the beamlets. Numerical examples are given and illustrated. It is shown that the irradiance distribution of the resulting beam is dependent upon the phase-or nonphase-locked combination, initial field (mode structure) and number of beamlets. array geometry, and fill factor. 2000 Published by Elsevier Science B.V. All rights reserved.

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The beam quality in coherent and incoherent combinations of one-dimensional off-axis Hermite-Gaussian beams

The beam quality in coherent and incoherent combinations of ...

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作者： baida lü, hong ma institute of laser physics & laser Technology, sichuan university, chengdu 610064. china

In this paper, the beam propagation factor (i.e., M-factor) and power in the bucket (PIB) are chosen as the criteria for characterizing beam quality. The coherent and incoherent combinations of one-dimensional (ID) off-axis higher-order Hermite-Gaussian beams are studied in detail. Our analytical and numerical results show that the resulting beam quality depends upon the coherent or incoherent combination, the field distribution of combined beams, their mode structure, number, normalized separate distance and geometrical arrangement. Interesting is that. as compared with the fundamental Gaussian beam combination, the coherent beam combination can not always result in the better beam quality.

关键词： Coherent and incoherent beam combinations -off-axis higher-order Hermite-Gaussian beam - beam quality- M~2-factor - power in the bucket (PIB)

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Investigation of True Ni^(2+)-Halide Distances in Alkali Halide lattices

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Journal of materials Science & Technology 1994年第2期10卷 154-156页

作者： Xuanrong ma(Department of physics, Ningxia university, Yinchuan, 750021, china)maolu DU(institute of Solid State physics, sichuan Normal university, chengdu, 610066, china)(To whom correspondence should be addressed) Ningxia Univ Yinchuan China

Using the μKα model of Ni2+-6X- cluster, the true distances between impurity Ni2+ cation and halide anion in alkali halide lattices are estimated from the optical spectra data. The results suggest that the true impurity cation- ligand anion distances are close to the sum of ionic radii of the impurity cation and ligand anion but not the cation - anion distance of the perfect lattices in the case of that the ionic radius of host cation is more larger than that of impurity cation

关键词： True Cl Br Investigation of True Ni Halide Distances in Alkali Halide lattices

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