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Kvantovaya Elektronika, 2010, Volume 40, Number 4, Pages 363–367 (Mi qe14236)  

This article is cited in 1 scientific paper (total in 1 paper)

Resonators. Modes

On the mechanism of transverse-mode beatings in a Fabry — Perot laser

N. Kumara, V. I. Ledenevb

a Indira Gandhi Centre for Atomic Reseach, India
b Institute on Laser and Information Technologies, Russian Academy of Scienses

Abstract: The mechanism of emergence of fundamental-mode and first-mode beatings in the case of a step-wise increase in the pump rate is studied under the stationary single-mode lasing conditions. Investigation is based on the numerical solution of nonstationary wave equations in a resonator in the quasi-optic approximation and on the equation for a relaxation-type medium as well as on the use of the first two Hermite — Gaussian polynomials ψ0,1(x) to obtain the distribution projections I0,1(t), g0,1(t) of the radiation intensity and gain, respectively. It is shown that the transverse-mode beatings emerge at early stages of two-mode lasing, the appearance of radiation intensity oscillations in the active medium preceding the development of the gain oscillations. The time of the passage of two-mode lasing to the stationary regime is determined. The phase shift π/2 between the oscillations I1(t) and g1(t) is found for the established beating regime and the modulation depth ΔI averaged over the output aperture of the radiation intensity in the established two-mode regime is shown to be proportional to the pump rate excess k over the single-mode lasing threshold. A scheme for controlling the mode composition of laser radiation is proposed, which is based on the rules for determining I0,1(t) by the sensor signals. The efficiency of the scheme is studied. The scheme employs two field intensity sensors mounted inside the resonator behind the output aperture.

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English version:
Quantum Electronics, 2010, 40:4, 363–367

Bibliographic databases:

PACS: 42.60.Da, 42.60.Mi
Received: 20.10.2009
Revised: 08.02.2010

Citation: N. Kumar, V. I. Ledenev, “On the mechanism of transverse-mode beatings in a Fabry — Perot laser”, Kvantovaya Elektronika, 40:4 (2010), 363–367 [Quantum Electron., 40:4 (2010), 363–367]

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  • http://mi.mathnet.ru/eng/qe/v40/i4/p363

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    Citing articles on Google Scholar: Russian citations, English citations
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    This publication is cited in the following articles:
    1. Quantum Electron., 40:9 (2010), 789–793  mathnet  crossref  adsnasa  isi  elib
  • Квантовая электроника Quantum Electronics
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