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Your search keyword '"Wa Kun Lam"' showing total 3 results
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3 results on '"Wa Kun Lam"'

1. Optical microscopy at the sub-nano scale via coherent population oscillations

Author

Wa Kun Lam, Girish S. Agarwal, and Kishore T. Kapale

Subjects
Quantum optics, Physics, education.field_of_study, business.industry, Resolution (electron density), Population, law.invention, Optics, Optical microscope, law, Microscopy, Nanometre, business, education, Image resolution, Nanoscopic scale
Abstract

We present methods for microscopy beyond the Rayleigh limit through the phenomena of coherent population oscillations. The atomic fluorescence shows sharp spatial features offering resolution below one nanometer using spatially shaped pump and probe beams.

Published
2013

2. Calculating adiabatic evolution of the perturbed DNLS/MNLS solitons

Author

Xiang-Jun Chen and Wa Kun Lam

Subjects
Physics, Classical mechanics, Nonlinear Sciences::Exactly Solvable and Integrable Systems, Residue theorem, FOS: Physical sciences, General Physics and Astronomy, Perturbation (astronomy), Pattern Formation and Solitons (nlin.PS), Symbolic computation, Adiabatic process, Nonlinear Sciences::Pattern Formation and Solitons, Nonlinear Sciences - Pattern Formation and Solitons
Abstract

A symbolic computation technique is developed to calculate adiabatic evolution equations for parameters of the perturbed DNLS/MNLS solitons obtained by the recently developed direct perturbation theory [X.-J. Chen and J. Yang, Phys. Rev. E {\bf 65}, 066608(2002)]. Effects of the intrapulse Raman scattering, third-order group velocity dispersion, and narrow-banded filters with nonlinear gain on the MNLS solitons are studied as examples., 10 pages, 1 figure. to be published on Phys. Lett. A

Published
2004

3. Initial-state dependence of a quantum resonance ratchet.

Author

Jiating Ni, Wa Kun Lam, Dadras, Siamak, Borunda, Mario F., Wimberger, Sandro, and Summy, Gil S.

Subjects
*BOSE-Einstein condensation, *INTERFEROMETERS, *RATCHETS
Abstract

We demonstrate quantum resonance ratchets created with Bose-Einstein condensates exposed to pulses of an off-resonant standing light wave. We show how some of the basic properties of the ratchets are controllable through the creation of different initial states of the system. In particular, our results prove that through an appropriate choice of initial state it is possible to reduce the extent to which the ratchet state changes with respect to time. We develop a simple theory to explain our results and indicate how ratchets might be used as part of a matter-wave interferometer or quantum random walk experiment. [ABSTRACT FROM AUTHOR]

Published
2016
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