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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Patent•
12 Jun 2002
TL;DR: In this paper, a piezoelectric adjusting element is used to adjust the frequency of the standing longitudinal acoustic wave expanding through a piezolectric oscillator in the direction of the oscillator resonant length as well as its height.
Abstract: The invention relates to a piezoelectric adjusting element, in particular a piezoelectric motor in the form of a monolithic plate-shaped or cylindrical piezoelectric oscillator comprised of a first and of a second kind of main surfaces and of groups of electrodes that are allocated to them, comprised of a housing, a driven element, at least one friction layer arranged on the housing or on the driven element, a driving element that is connected to an electric excitation source and that is in friction contact with the friction layer, and the piezoelectric oscillator is excited by way of the groups of electrodes [to form] standing longitudinal acoustic waves in the direction of an oscillator resonant length and in the direction of an oscillator resonant height of this piezoelectric oscillator, and the oscillator resonant length is equal to an integral multiple of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant height is equal to one half of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant length as well as the oscillator resonant height are chosen in such a way that the frequencies of the standing longitudinal acoustic waves expanding through the piezoelectric oscillator are equal both in the direction of the oscillator resonant length as well as in the direction of the oscillator resonant height.
50 citations
TL;DR: This work considers the simplest quantum model for a degenerate parametric oscillator below threshold and analyze the quantum properties of the signal near field and introduces the idea of probing the emitted field by a local oscillator field of arbitrary spatial configuration to explore the spatial structure of the squeezed vacuum state emitted by the system.
Abstract: We analyze the quantum properties of the signal near field emitted by a degenerate parametric oscillator below threshold, including diffraction and its effects on the threshold for signal generation. The field is probed by a local oscillator field of arbitrary spatial configuration. The results are expressed in terms of an appropriate spectrum which describes how the level of squeezing varies with the angle from the direction of propagation. The results hold for cavities both with plane and with spherical mirrors.
50 citations
Proceedings Article•
15 Jun 2011TL;DR: In this article, a 553 GHz quadruple push oscillator was demonstrated using low leakage transistors in 45-nm CMOS, where the currents of coupling transistors were summed up to implement quadruple pushing.
Abstract: A 553-GHz quadruple-push oscillator is demonstrated using low leakage transistors in 45-nm CMOS. The currents of coupling transistors of a quadrature oscillator were summed up to implement quadruple pushing. Quasi-optical measurements showed that the circuit generates 4th harmonic signal at 553 GHz with the power level of 220 nW, while suppressing unwanted harmonic signals. The circuit consumes 64 mW from a 1.4 V supply.
50 citations
TL;DR: In this article, the effects of reducing the Q of one of the resonant cavities of the doubly resonant oscillator are treated in detail, and an analysis is given that predicts the frequency instabilities resulting from the presence of a slight feedback at the nonresonant mode in a nearly singly oscillator.
Abstract: This paper is a theoretical examination of the frequency instabilities of the doubly resonant parametric oscillator. Such instabilities, caused by attempts to resonate simultaneously fields of two frequencies in unstabilized dispersive optical cavities, largely account for the poor performance of early parametric oscillators. The effects of reducing the Q of one of the resonant cavities of the doubly resonant oscillator are treated in detail. An analysis is given that predicts the frequency instabilities resulting from the presence of a slight feedback at the nonresonant mode in a nearly singly resonant oscillator. The analysis shows that the nonresonant mode feedback must be completely eliminated to prevent double-cavity oscillator-frequency instabilities.
50 citations
TL;DR: In this article, the first singly resonant cw optical parametric oscillator (SRO) that is directly pumped by a diode laser was presented. But the SRO was not designed to be used in a single-input single-output (SISO) system.
Abstract: We report on what is believed to be the first singly resonant cw optical parametric oscillator (SRO) that is directly pumped by a diode laser. The SRO consists of a 38-mm-long periodically poled LiNbO3 crystal in a four-mirror signal-resonant ring cavity. Pumped by 2.5 W of 925-nm diode-laser radiation, the SRO generates 480 mW of single-frequency idler radiation at 2.1 µm. The wavelengths of the signal and the idler output are tuned in the ranges of 1.55 to 1.70 µm and 2.03 to 2.29 µm, respectively, by tuning the wavelength of the diode laser from 924.0 to 925.4 nm.
50 citations