Damping mechanism of the relaxation oscillations in a gas mixture fast flow laser

Kuz’minskii, L. S.; Luzhinskaya, Yu. V.; Odintsov, A. I.; Fedoseev, A. I.

doi:10.3103/s0027134908060040

Cited by 2 publications

(2 citation statements)

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“…Our consideration was limited to the frequency range close to the relaxation frequency (Ω ≈ Ω 0 ), where the maximum values of the instability increments occur, and to the systems with strong damping of the edge flow perturbations. The width of the axial zone h 0 was chosen as a controlling parameter because its value, according to (12), determines the resonant frequencies of the internal perturbations. The value of h 0 was varied by changing the spatial profile of the pumping rate.…”

Section: Regime Controlmentioning

confidence: 99%

“…In particular, it was shown that the periodic structure of the optical field in the amplifier cavity can stimulate self-oscillation instability [13]. The presence of an inhomogeneous field that shows declining intensity towards the optical axis of UC is an essential condition for triggering selfpulsation while energy exchange processes facilitate the stabilization of stationary lasing [3,4,12].…”

Section: Introductionmentioning

confidence: 99%

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The gradient waves of perturbations as an instability factor in fast-flow lasers

et al. 2016

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We study the mechanism of the self-oscillation instability associated with the nonlinear interaction of radiation with a moving active medium in a fast-flow gas laser. The results of our analytical and numerical calculations of the frequencies and increments of the small self-oscillation perturbations in an unstable cavity of the laser with a non-uniform pumping rate are presented. In the analytical model the small perturbations of the gain in each point of the flow consist of two parts. The first part includes the 'local' perturbations that are not related to a motion of the medium. The second part includes the 'flow' perturbations that arise upstream of the flow due to the gradients of the pumping rate and the laser field intensity. These perturbations are carried by the flow in the form of traveling waves. The interference of the 'gradient' waves of the flow perturbations results in the resonant properties of the feedback produced by the flow. It is demonstrated that it is feasible to control the lasing regime based on these resonant properties of the feedback. The simulation of the nonlinear lasing regimes demonstrates that the conversion of continuous lasing into the periodical self-pulsing regime is not accompanied by a significant reduction in the average power output.

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Section: Regime Controlmentioning

confidence: 99%