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Phan Van Thuan

Bio: Phan Van Thuan is an academic researcher from Vinh University. The author has contributed to research in topics: Electromagnetically induced transparency & Optical bistability. The author has an hindex of 2, co-authored 3 publications receiving 35 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, an optical bistability model consisting of a five-level cascade electromagnetically induced transparency medium placed in a unidirectional ring cavity is proposed and an input-output intensity relationship for a weak probe light field is derived as a function of parameters of a strong coupling light and cooperation C.
Abstract: We propose an optical bistability (OB) model consisting of a five-level cascade electromagnetically induced transparency (EIT) medium placed in a unidirectional ring cavity. An input-output intensity relationship for a weak probe light field is derived as a function of parameters of a strong coupling light and cooperation C. The OB behaviors of the system are investigated with variation of the parameters. It has been shown that the OB behaviors occur simultaneously in three EIT windows. Furthermore, switching thresholds and the hysteresis loop can be controlled by the parameters of the coupling light and/or a cooperation of atomic medium. Such controllable OB behaviors can find interesting applications in bistable photonic devices working at low light intensity and multiple frequencies.

23 citations

Journal ArticleDOI
Dinh Xuan Khoa1, Le Canh Trung1, Phan Van Thuan1, Le Van Doai1, Nguyen Huy Bang1 
TL;DR: In this article, the authors measured the dispersive profile of a multi-window EIT spectrum in a medium consisting of Rb atoms in the presence of Doppler broadening.
Abstract: We have measured the dispersive profile of a multiwindow electromagnetically induced transparency (EIT) spectrum in a medium consisting of Rb atoms in the presence of Doppler broadening. The atomic medium is excited by a strong coupling light and a weak probe laser light via the V-type transitions within the D2 manifold. Under the EIT effect, an anomalous dispersive region of the medium is basically modified into multinormal and anomalous dispersive regions. Furthermore, the slope and position of the dispersion can be controlled with the intensity and frequency of the coupling light. An analytic model is proposed to simulate the observed spectrum with a good agreement. Such controllable dispersive properties with their analytic description would be useful for finding applications related to multiwindow EIT phenomena.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the optical bistability of an electromagnetically induced transparency medium placed in a conventional unidirectional ring cavity is investigated numerically, where the medium is excited by a coupling and probe laser lights via a five-level cascade scheme.
Abstract: Optical bistability (OB) of an electromagnetically induced transparency (EIT) medium placed in a conventional unidirectional ring cavity is investigated numerically. The medium is excited by a coupling and probe laser lights via a five-level cascade scheme. It is shown that optical bistabe states with controllable switching threshold intensities and width establish simultaneously in three spectral regions corresponding to EIT windows. The current numerical result is compared to a previous analytical result showing influence of coherence terms neglected in the analytical model.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: It is shown that the magneto-optic resonances can be continuously tuned from EIT to EIA by changing the relative handedness of circular polarizations of pump and probe beams, or depending on whether they co- or counter-propagate.
Abstract: We demonstrate high-contrast electromagnetically induced absorption (EIA) bright resonances on the D1 line of K39 with characteristics comparable to those of the electromagnetically induced transparency (EIT) dark resonances observed in the same conditions. EIA is produced by the interaction of a weak probe beam with the atomic ground state driven in a degenerate coherent superposition by either a co- or counter-propagating pump beam. We have obtained an order of magnitude increase of the EIA’s contrast with respect to previous similar experiments, performed with other alkalis, without compromising its linewidth. Furthermore, we show that the magneto-optic resonances can be continuously tuned from EIT to EIA by changing the relative handedness of circular polarizations of pump and probe beams, or depending on whether they co- or counter-propagate. This opens new perspectives in the use of EIA in a broad range of physical domains and in a large wealth of potential applications in optics and photonics.

27 citations

Proceedings Article
22 May 1995
TL;DR: Laser oscillation without population inversion is demonstrated experimentally in a V-type atomic configuration within the lines of Rb vapor and it is shown that the effect is due to the atomic interference.
Abstract: Laser oscillation without population inversion is demonstrated experimentally in a V-type atomic configuration within the ${D}_{1}\mathrm{and}{D}_{2}$ lines of Rb vapor. It is shown that the effect is due to the atomic interference. The experimental results, as first predicted by careful theoretical analysis, are in a good agreement with detailed calculations.

23 citations

Journal ArticleDOI
01 Feb 2017-Optik
TL;DR: In this article, a pair of probe and coupling laser pulses propagating in a Doppler broadened three-level cascade atomic medium were studied in a wide region of pulse duration, from micro to pico second.

22 citations

Journal ArticleDOI
TL;DR: In this article, the influence of spontaneously generated coherence (SGC) and relative phase of laser fields on a probe laser pulse propagating in a three-level cascade atomic medium under incoherent pumping and electromagnetically induced transparency (EIT) is studied theoretically.

21 citations

Journal ArticleDOI
TL;DR: A system based on degenerated two-level atoms placed in a ring cavity and an external magnetic field that exhibits optical bistability and switching properties in which its thresholds and switching rate can be controlled by modulating intensity of the magnetic field or the coupling light field.
Abstract: We propose a simple system for both optical switching and bistability based on degenerated two-level atoms placed in a ring cavity and an external magnetic field. The magnetic field splits a lower level into two separated levels, both of which are connected to an upper level by coupling and probe laser fields. Under an electromagnetically induced transparency regime, the system exhibits optical bistability and switching properties in which its thresholds and switching rate can be controlled by modulating intensity of the magnetic field or the coupling light field. Furthermore, the system can be controlled to work in varying frequency regimes by using a sole laser for both coupling and probe fields. Such a proposed scheme may be useful for realization of optical switches and storage devices.

17 citations