Experimental Demonstration of Laser Oscillation without Population Inversion via Quantum Interference in Rb

Zibrov, A. S.; Lukin, Mikhail D.; Nikonov, Dmitri E.; Hollberg, L.; Scully, Marlan O.; Velichansky, V. L.; Robinson, H. G.

doi:10.1103/physrevlett.75.1499

Cited by 535 publications

(199 citation statements)

References 13 publications

(4 reference statements)

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“…In particular, excited-state population grows with time differently for the multiphoton excitation and the QASER, as indicated in Eqs. (20) and (21). We also show that the QASER is analogous to excitation of a system of two weakly coupled oscillators, which displays the difference combination resonance when the low modulation frequency matches the frequency difference between two close normal modes of the coupled system.…”

Section: Discussionmentioning

confidence: 89%

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Quantum Amplification by Superradiant Emission of Radiation

2013

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A laser generates light through stimulated emission of radiation and requires population inversion. Quantum interference can yield lasing without inversion. However, such phase-sensitive quantum amplification still requires some atomic population in the excited state. Here, we present a new kind of quantum amplifier based on collective superradiant emission which does not need any population in the excited state. We show that parametric resonance between the driving (e.g., infrared) field and collective superradiant oscillations of the atomic polarization can yield light amplification at high (e.g., XUV) frequencies. To achieve gain, one must suppress a time-dependent Stark shift caused by the driving field. The resulting superradiant amplifier is many orders of magnitude more efficient than the usual nonlinear multiphoton excitation and holds promise for a new kind of generator of highfrequency coherent radiation. In addition to a detailed analytical analysis, confirmed by numerical simulations, we provide a physically appealing explanation of the quantum amplification by superradiant emission of radiation (QASER) operation in terms of coupled classical oscillators. We also present an experiment that demonstrates the QASER amplification mechanism in an electronic circuit, which, to the best of our knowledge, is the first experimental demonstration of the difference combination resonance.

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Section: Discussionmentioning

confidence: 89%

“…During the last two decades, lasing without inversion (LWI) has been discussed in the literature for various schemes [18][19][20][21]. Typically, LWI is achieved by quantum interference in emission or absorption channels.…”

Section: Introductionmentioning

confidence: 99%

Quantum Amplification by Superradiant Emission of Radiation

2013

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“…The search for new structures and designs that can lead to intersubband gain without population inversion is thus both fascinating from the fundamental physics point of view as it is relevant for * Presented at the International Conference on Semiconductor Materials and Optics, SMMO 2008, October 9-10, 2008, Warsaw, Poland † E-mail: M.Pereira@shu.ac.uk applications. To the best of the author's knowledge, the first demonstration of lasing without inversion appeared in atomic optics and was based on quantum interference in Rb atoms [4]. Here we analyse a very different scenario in intersubband emitters [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Valence intersubband gain without population inversion

Pereira

2009

Open Physics

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“…Such a three-level model is not known to show gain unless additional fields are introduced. For example, an incoherent pumping along the probing transition of a V-system will give rise to gain [7,8] . Other three-level models with coherent and incoherent pumping also exhibit gain [9].…”

Section: Introductionmentioning

confidence: 99%

Gain components in the Autler-Townes doublet from quantum interferences in decay channels

1999

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We consider non-degenerate pump-probe spectroscopy of V-systems under conditions such that interference among decay channels is important. We demonstrate how this interference can result in new gain features instead of the usual absorption features. We relate this gain to the existence of a new vacuum induced quasi-trapped-state. We further show how this also results in large refractive index with low absorption.

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Experimental Demonstration of Laser Oscillation without Population Inversion via Quantum Interference in Rb

Cited by 535 publications

References 13 publications

Quantum Amplification by Superradiant Emission of Radiation

Quantum Amplification by Superradiant Emission of Radiation

Valence intersubband gain without population inversion

Gain components in the Autler-Townes doublet from quantum interferences in decay channels

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