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 amplitude-squeezed local oscillator (LO) field at 428.8 nm is generated from a high efficiency single-pass second-harmonic generation in a crystal pumped by femtosecond (130 fs) pulses at 857.6 nm.
Abstract: We experimentally demonstrate a novel sub-shot-noise-limited heterodyne detection scheme to measure a weak optical signal field by employing amplitude-squeezed light as the local oscillator (LO) field. The amplitude-squeezed LO field at 428.8 nm is generated from a high efficiency single-pass second-harmonic generation in a ${\mathrm{KNbO}}_{3}$ crystal pumped by femtosecond (130 fs) pulses at 857.6 nm, and the signal field is combined with the generated squeezed LO field through the crystal. An enhancement of 0.7 dB (1.4 dB inferred) in signal-to-noise ratio beyond the shot-noise limit is directly observed.
35 citations
TL;DR: In this article, a nonlinear parameter-excited model of spinning pipes conveying fluid is proposed by considering the spinning speed and flow velocity are perturbed periodically, and the stability and nonlinear parametric vibrations of such system are studied analytically and numerically.
35 citations
01 Jun 1945
TL;DR: In this paper, an enclosed harmonic oscillator is considered and the usual boundary condition that the wave function vanishes at infinity is replaced by the condition that it remains at the walls of the enclosure.
Abstract: 1. The present paper deals with an enclosed (linear) harmonic oscillator. The usual boundary condition that the wave function vanishes at infinity is here replaced by the condition that the wave function vanishes at the walls of the enclosure. The problem has been treated before (1, 2, 4). However, the present discussion goes much further than that given in the papers cited*.
35 citations
08 Jun 2003
TL;DR: In this paper, a low-noise varactor tuned oscillator based on a film bulk acoustic resonator (FBAR) at 2 GHz was presented, with phase noise of -112 dBc/Hz at 10 kHz from the carrier.
Abstract: This paper describes the design and measured performance of a low-noise varactor tuned oscillator based on a film bulk acoustic resonator (FBAR) at 2 GHz. Using varactor tuning, this oscillator demonstrated a 2.5 MHz frequency tuning range at 1985 MHz with a phase noise of -112 dBc/Hz at 10 kHz from the carrier. This represents the first example of a low noise Si-bipolar FBAR tunable oscillator.
35 citations
TL;DR: It is shown that by using local oscillator amplitude and phase pulse shaping it should be possible to achieve more than 40 dB of detectable quadrature squeezing where it is possible to neglect transverse spatial dimensions and diffraction, such as in a waveguide.
Abstract: We investigate temporal effects in pulsed squeezing by parametric amplification, including effects of group-velocity dispersion. Our calculations show that the local oscillator pulse used to detect the squeezed field cannot be made shorter than the inverse phase-matching bandwidth of the generation process without degrading the amount of squeezing detected. This result generalizes an earlier result that showed that in the absence of dispersion, the local oscillator pulse duration should approach zero for optimum squeezing detection. We further show that by using local oscillator amplitude and phase pulse shaping it should be possible to achieve more than 40 dB of detectable quadrature squeezing. This is applicable where it is possible to neglect transverse spatial dimensions and diffraction, such as in a waveguide. We derive the s-parametrized quasiprobability evolution equation for the traveling-wave parametric amplifier. As the Wigner representation results in third-order derivatives, we also use the positive-P representation as an exact representation with equivalent Ito stochastic differential equations. This allows us to compare approximate --- but easily simulated --- Wigner representation results with those using the positive-P representation.
35 citations