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Your search keyword '"Chávez-Cerda, Sabino"' showing total 49 results
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49 results on '"Chávez-Cerda, Sabino"'

1. Structured light beams constituted of incoming and outgoing waves

Author

Mendoza-Hernández, Job, Arrroyo-Carrasco, Maximino Luis, Iturbe-Castillo, Marcelo David, and Chávez-Cerda, Sabino

Subjects
Physics - Optics
Abstract

In the present work, we demonstrate that structured light beams are constituted by two traveling waves which transverse components are in opposite directions, that is, incoming and outgoing from the axis of propagation. These waves result from the complex sum of the two fundamental solutions of the transverse component of the spatial wave equation. After a partial obstruction of the beam, the incoming and outgoing waves can be easily observed during the self-healing process, providing a simple explanation of the phenomenon. Incoming and outgoing waves in Laguerre-Gauss beams are investigated analytically, numerically and experimentally. The proposed way to describe light beams might offer new insights into the phenomenon of diffraction., Comment: 7 pages, 7 figures

Published
2019
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2. Self-healing in scaled propagation invariant beams

Author

Arrizón, Victor, Aguirre-Olivas, Dilia, Mellado-Villaseñor, Gabriel, and Chávez-Cerda, Sabino

Subjects
Physics - Optics
Abstract

We analyze and demonstrate, numerically and experimentally, the self-healing effect in scaled propagation invariant beams, subject to opaque obstructions.We introduce the signal to noise intensity ratio, a semi-analytical figure of merit, explicitly dependent on the features of the beams and the obstructions applied to them. The effect is quantitatively evaluated employing the Root Mean Square deviation and the similarity function.

Published
2015

5. Segmented Vortex Telescope and its Tolerance to Diffraction Effects and Primary Aberrations

Author

Treviño, Juan P., López-Cruz, Omar, and Chávez-Cerda, Sabino

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We propose the segmented Large Millimeter Telescope (LMT/GTM),as the largest spatial light modulator capable of producing vortex beams of integer topological charge. This observing mode could be applied for direct exoplanet searches in the millimeter or submillimeter regimes. We studied the stability of the vortex structure against aberrations and diffraction effects inherent to the size and segmented nature of the collector mirror. In the presence of low order aberrations the focal distribution of the system remains stable. Our results show that these effects depend on the topological charge of the vortex and the relative orientation of the aberration with respect to the antenna axis. Coma and defocus show no large effects in the image at the focal plane, nevertheless the system is very sensitive to astigmatism. Heat turbulence, simulated by random aberrations, shows that the system behaves in a similar way as astigmatism dissociating the vortices. We propose the Segmented Vortex Telescope as a novel approach for the detection of giant planets outside circumstellar disks around nearby stars. Since our results are applicable to other facilities with segmented surfaces, we suggest that this idea should be considered as a regular observation mode complementary to interferometric methods., Comment: To appear at the August 2013 feature issue of Optical Enginering: Ground-Based/Airborne Telescopes and Instrumentation. Includes 11 figures

Published
2013
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20. Generation of partially coherent beams with controllable time-dependent coherence.

Author

Ziyang Chen, Xudong Chen, Jixiong Pu, and Chávez-Cerda, Sabino

Subjects
COHERENCE (Optics), SPATIAL light modulators, LASER beams
Abstract

A straight effective method to produce partially coherent beams with controllable time-dependent coherence is demonstrated. We theoretically deduce that a time-dependent partially coherent beam can be generated by imposing dynamic random phase on a coherent laser beam. The degree of coherence of the beam is determined by an amplitude control parameter of the dynamic random phase. We experimentally corroborate that after a completely coherent laser beam reflected from a spatial light modulator, loaded with a particular dynamic random phase, this beam is transformed into a partially coherent beam with time-dependent coherence. [ABSTRACT FROM AUTHOR]

Published
2017
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25. Optical system interferometry for invariant fields

Author

Iturbe Castillo M. David, Erwin Martí Panameño, Chávez-Cerda Sabino, Anguiano Morales Marcelino, and Mendez Otero M. Maribel

Subjects
Physics, Interferometry, symbols.namesake, Optics, Computer simulation, business.industry, symbols, Invariant (physics), business, Bessel function
Abstract

We study experimentally and numerically the intensity distributions obtained by interference of several equal zero-order Bessel beams. Depending on the way of generation the resultant field can be considered as propagation invariant or not.

Published
2005

47. Production of high-order Bessel beams with a Mach-Zehnder interferometer

Author

López-Mariscal, Carlos, Gutiérrez-Vega, Julio C., and Chávez-Cerda, Sabino

Abstract

A new experimental setup is demonstrated to produce high-order Bessel beams. It is based on the field decomposition of the Bessel beam into its even and odd field components. The implementation is performed over the spectral components with a Mach-Zehnder interferometer that synthesizes the components into the desired Bessel beam. The main advantage of our setup is that the required annular transmittances have only discrete phase changes of π radians instead of a continuous change of phase.

Published
2004

49. Observation of parabolic nondiffracting optical fields.

Author

López-Mariscal C, Bandres M, Gutiérrez-Vega J, and Chávez-Cerda S

Abstract

We report the first experimental observation of parabolic non-diffracting beams, the fourth fundamental family of propagation-invariant optical fields of the Helmholtz equation. We generate the even and odd stationary parabolic beam and with them we are able to produce traveling parabolic beams. It is observed that these fields exhibit a number of unitary in-line vortices that do not interact on propagation. The experimental transverse patterns show an inherent parabolic structure in good agreement with the theoretical predictions. Our results exhibit a transverse energy flow of traveling beams never observed before.

Published
2005
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