Topic
Parametric oscillator
About: Parametric oscillator is a research topic. Over the lifetime, 5836 publications have been published within this topic receiving 95631 citations. The topic is also known as: Parametric excitation.
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TL;DR: In this article, the theory of parametric amplification by a series of unbiased Josephson junctions is presented, and various regimes of operation are explored, including a very small pump power and a large bandwidth.
Abstract: The theory of parametric amplification by a series of unbiased Josephson junctions is presented. The various regimes of operation are explored. This device is in many ways different from the usual varactor parametric amplifier. In particular, a very small pump power is required and a large bandwidth is obtained. Comparison with experimental data is made.
84 citations
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TL;DR: In this paper, the authors reported the observation of high-intensity sub-Poissonian light using the correlated ''twin'' beams generated by an optical parametric oscillator, where the intensity fluctuations in one of these beams are reduced by a feed forward correction mechanism that monitors the intensity of the second beam.
Abstract: We report the observation of high-intensity sub-Poissonian light using the correlated ``twin'' beams generated by an optical parametric oscillator. The intensity fluctuations in one of these beams are reduced by a feedforward correction mechanism that monitors the intensity of the second beam. The observed reduction in noise power is up to 24% below the shot-noise limit.
84 citations
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TL;DR: In this article, a two-stage inflation model consisting of a scalar field with an axion-monodromy-like periodic structure in the potential that governs the first stage and another field with a hilltop-like potential dominating the second stage is presented.
Abstract: We present a new realization of the resonant production of primordial black holes as well as gravitational waves in a two-stage inflation model consisting of a scalar field $\ensuremath{\phi}$ with an axion-monodromy-like periodic structure in the potential that governs the first stage and another field $\ensuremath{\chi}$ with a hilltoplike potential that dominates the second stage. The parametric resonance seeded by the periodic structure at the first stage amplifies the perturbations of both fields inside the Hubble radius. While the evolution of the background trajectory experiences a turn as the oscillatory barrier height increases, the amplified perturbations of $\ensuremath{\chi}$ remain as they are and contribute to the final curvature perturbation. It turns out that the primordial power spectrum displays a significant resonant peak on small scales, which can lead to an abundant production of primordial black holes. Furthermore, gravitational waves are also generated from the resonantly enhanced field perturbations during inflation, the amplitude of which may be constrained by future gravitational wave interferometers.
84 citations
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TL;DR: This work has studied the amplification of a single-mode electromagnetic field by an atomic system with a three-level cascade structure in two-photon resonance conditions when the top and bottom levels are mixed coherently by a strong external resonant field.
Abstract: A linear theory of two-photon amplification by three-level atoms in the cascade configuration is developed, where a coherence is induced between the top and bottom levels, by an external classical driving field. It is shown that this system becomes an ideal parametric amplifier for sufficiently strong driving field, whereas for a weak driving field it is a phase-insensitive amplifier. In between these two extremes, one finds phase-sensitive amplification as well as squeezing for a certain range. The system does not, however, reduce to a model studied previously where the atomic coherence was treated as an initial condition. The system is also studied in a cavity configuration: It is predicted that the oscillator may behave as a two-photon correlated emission laser, i.e., its phase diffusion coefficient vanishes.
84 citations
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TL;DR: In this paper, an explicit asymptotic formula for the norms of the spectral projections of the non-self-adjoint harmonic oscillator H is given. But the spectral expansion of e−Ht is norm convergent if and only if t is greater than a certain explicit positive constant.
Abstract: We obtain an explicit asymptotic formula for the norms of the spectral projections of the non-self-adjoint harmonic oscillator H. We deduce that the spectral expansion of e−Ht is norm convergent if and only if t is greater than a certain explicit positive constant.
83 citations