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1.
The problem of a harmonic oscillator subject to both additive and multiplicative gaussian noise is solved analytically by means of an iteration procedure. Our solution agrees very closely with earlier predictions available in the literature. The reliability of perturbation approaches to stochastic systems that do not verify the detailed balance conditions is criticized by comparison with exact results worked out for this peculiar model. The effects due to finite correlation times of the fluctuations are also accounted for analytically. All of our predictions have been checked by means of analogue simulation. 相似文献
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A. F. Kurin 《Technical Physics》2008,53(10):1247-1260
Phase bunching in an ensemble of oscillators is considered by solving the Cauchy problem for the Mathieu equation using the
asymptotic method of averaging in the third approximation for the zeroth resonance zone and in the fourth approximation for
the first, second, third, and fourth zones in instability regions, as well as in stability regions near the boundaries with
instability regions. It is shown that the existence and regularities of bunching follow from analysis of the well-known physical
phenomenon, viz., beats of two oscillations. By way of example, parametric oscillations of charges at a node of the electric
field of a standing wave are considered. 相似文献
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J. Zhu C. Q. Ru A. Mioduchowski 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(4):411-421
This paper studies parametric resonance of coupled
micromechanical oscillators under periodically varying nonlinear coupling
forces. Different from most of previous related works in which the
periodically varying coupling forces between adjacent oscillators are
linearized, our work focuses on new physical phenomena caused by the
periodically varying nonlinear coupling. Harmonic balance method (HBM)
combined with Newton iteration method is employed to find steady-state
periodic solutions. Similar to linearly coupled oscillators studied
previously, the present model predicts superharmonic parametric resonance
and the lower-order subharmonic parametric resonance. On the other hand, the
present analysis shows that periodically varying nonlinear coupling
considered in the present model does lead to the appearance of high-order
subharmonic parametric resonance when the external excitation frequency is a
multiple or nearly a multiple (≥3) of one of the natural
frequencies of the oscillator system. This remarkable new phenomenon does
not appear in the linearly coupled micromechanical oscillators studied
previously, and makes the range of exciting resonance frequencies expanded
to infinity. In addition, the effect of a linear damping on parametric
resonance is studied in detail, and the conditions for the occurrence of the
high-order subharmonics with a linear damping are discussed. 相似文献
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V. E. Shapiro 《Physics letters. A》2001,290(5-6):288-296
We single out and elucidate basic features of strongly coupled parametric oscillators as opposed by symmetry to the type reducible to uncoupled Mathieu equations. The strongly coupled type is essential to the oscillations and waves in rotating structures and chiral systems. It exhibits only the main parametric resonance, no higher-order ones. As well, the relaxation–fluctuation behavior is unusual, characterized by a negative-energy oscillation mode that is, nonetheless, stable so the Gibbs statistics lose its force. The models presented are exactly solvable. 相似文献
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Gammaitoni L. Marchesoni F. Menichella-Saetta E. Santucci S. 《Il Nuovo Cimento D》1995,17(7-8):785-793
Summary Stochastic resonance in a bistable potential is characterized as a syncronization effect of the hopping mechanism induced
by the external periodic bias. Most notably, syncronization is shown i) to attain a maximum with increasing the forcing frequency
close to the relevant switching rate, thus revealing abona fide resonant process; ii) to occur even in the absence of symmetry breaking by the periodic forcing term.
Paper presented at the International Workshop “Fluctuations in Physics and Biology: Stochastic Resonance, Signal Processing
and Related Phenomena”, Elba, 5–10 June 1994. 相似文献
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J.-M. Melkonian A. Godard M. Lefebvre E. Rosencher 《Applied physics. B, Lasers and optics》2007,86(4):633-642
It is known that the idler conversion efficiency of optical parametric oscillators (OPOs) can be increased by adding a second
nonlinear crystal in the cavity. This crystal is pumped by the signal and acts as an optical parametric amplifier (OPA) for
the idler. However, this technique unavoidably increases the oscillation threshold because of additional losses and increased
build-up time due to cavity lengthening. In this paper, we investigate both theoretically and experimentally the benefits
and drawbacks of this so called OPO–OPA configuration versus the singly resonant OPO (SRO) configuration. Calculations are
found to be in agreement with an experimental study of a SRO and an OPO–OPA operating near 3.4 μm both pumped by a 90-mJ 27-ns
Nd:YAG laser. Our study reveals that the OPO–OPA needs to be driven at least two times above threshold to produce more idler
energy than the SRO. In addition, near 3 μm the OPO–OPA is particularly efficient given that the difference frequency wave
generated in the second crystal is also output coupled.
PACS 42.65.Yj; 42.65.Sf 相似文献
8.
Collective stochastic resonance behaviors of two coupled harmonic oscillators driven by dichotomous fluctuating frequency 下载免费PDF全文
《中国物理 B》2021,30(6):60502-060502
The collective behaviors of two coupled harmonic oscillators with dichotomous fluctuating frequency are investigated,including stability, synchronization, and stochastic resonance(SR). First, the synchronization condition of the system is obtained. When this condition is satisfied, the mean-field behavior is consistent with any single particle behavior in the system. On this basis, the stability condition and the exact steady-state solution of the system are derived. Comparative analysis shows that, the stability condition is stronger than the synchronization condition, that is to say, when the stability condition is satisfied, the system is both synchronous and stable. Simulation analysis indicates that increasing the coupling strength will reduce the synchronization time. In weak coupling region, there is an optimal coupling strength that maximizes the output amplitude gain(OAG), thus the coupling-induced SR behavior occurs. In strong coupling region, the two particles are bounded as a whole, so that the coupling effect gradually disappears. 相似文献
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We review the progress in the development of continuous-wave optical parametric oscillators over the last decade. A recently developed theoretical analysis shows that their stability strongly depends on the group velocity dispersion of the nonlinear material used. Now, these devices generate not only near- and mid-infrared radiation, but also visible and terahertz light. Active locking to external references like atom transitions, resonators, or frequency combs enables mode-hop-free operation up to days. Furthermore, whispering-gallery-resonator-based devices enable the realization of millimeter-sized monolithic resonators with microwatt oscillation thresholds. 相似文献
12.
Stochastic resonance is a statistical phenomenon that has been observed in periodically modulated, noise-driven, bistable systems. The characteristic signatures of the effect include an increase in the signal-to-noise of the output as noise is added to the system, and exponentially decreasing peaks in the probability density as a function of residence times in one state. Presented are the results of a numerical simulation where these same signatures were observed by adding achaotic driving term instead of a white noise term. Although the probability distributions of the noise and chaos inputs were significantly different, the stochastic and chaotic resonances were equal within the experimental error. 相似文献
13.
Single resonant parametric oscillators including intracavity quadratic and cubic nonlinearities are described in the mean-field limit with a cubic and quintic complex Ginzburg-Landau equation. Following our model, simple design criteria are derived for the generation of solitonlike pulses and beams for singly resonant optical parametric oscillators. 相似文献
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4 (RTA), which provides a threshold pump power of 16 mW. The maximum signal wave power is 23 mW at a wavelength of 1243 nm.
The spectral bandwidth of the signal wave is less than 750 kHz.
Received: 3 February 1998 相似文献
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We study sets of genetic networks having stochastic oscillatory dynamics. Depending on the coupling topology we find regimes
of phase synchronization of the dynamical variables. We consider the effect of time-delay in the interaction and show that for suitable
choices of delay parameter, either in-phase or anti-phase synchronization can occur.
相似文献
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Theoretical studies of synchronization are usually based on models of coupled phase oscillators which, when isolated, have constant angular frequency. Stochastic discrete versions of these uniform oscillators have also appeared in the literature, with equal transition rates among the states. Here we start from the model recently introduced by Wood et al. [K. Wood, C. Van den Broeck, R. Kawai, K. Lindenberg, Universality of synchrony: critical behavior in a discrete model of stochastic phase-coupled oscillators, Phys. Rev. Lett. 96 (2006) 145701], which has a collectively synchronized phase, and parametrically modify the phase-coupled oscillators to render them (stochastically) nonuniform. We show that, depending on the nonuniformity parameter 0≤α≤1, a mean field analysis predicts the occurrence of several phase transitions. In particular, the phase with collective oscillations is stable for the complete graph only for α≤α′<1. At α=1 the oscillators become excitable elements and the system has an absorbing state. In the excitable regime, no collective oscillations were found in the model. 相似文献