Effective focusing of a diverging atomic beam by a sequence of alternatively chirped few-cycle pulsed laser fields

Abdelsalam H. M. Abdelaziz, Parvendra Kumar, and Amarendra K. Sarma
Phys. Rev. A 99, 023408 – Published 6 February 2019

Abstract

We theoretically show how the effective focusing and defocusing of a diverging atomic beam can be realized using an appropriate sequence of linearly chirped few-cycle pulsed laser fields. First, we investigate and show that the time averaged optical dipole force induced by the sequence of either positively or negatively chirped pulses vanishes due to the periodic oscillations of the phases of in-phase components of atomic dipole moments. Then, we demonstrate that this issue could be overcome by utilizing a sequence of alternatively chirped pulses instead of either positively or negatively chirped pulses. It is shown that for such a sequence of pulses, the phases of in-phase components of atomic dipole moments does not oscillate periodically and in fact remain constant at either 0 or π depending on the chirping direction of the initial pulse, resulting in either an effective focusing or defocusing optical dipole force. The trajectory of atoms under an optical dipole force is also investigated to actually show the focusing and defocusing. Finally, the role of beam shape on the proposed scheme is investigated and it turns out that a super-Gaussian pulse of order m=2 shows more efficacy compared to the normal Gaussian pulse.

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  • Received 11 October 2018
  • Corrected 13 March 2019

DOI:https://doi.org/10.1103/PhysRevA.99.023408

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Corrections

13 March 2019

Correction: The previously published Figure 2 lacked panel labels and has been fixed.

Authors & Affiliations

Abdelsalam H. M. Abdelaziz1,2,*, Parvendra Kumar3,4,†, and Amarendra K. Sarma1,‡

  • 1Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
  • 2Department of Physics, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
  • 3Thin Film Laboratory, Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
  • 4Department of Physics, Bhagini Nevidita College, University of Delhi, New Delhi-110043, India

  • *ahm.abdelaziz@iitg.ac.in
  • parvendra1986@gmail.com
  • aksarma@iitg.ac.in

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Issue

Vol. 99, Iss. 2 — February 2019

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