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 normal and time ordered spatial intensity correlation function of the signal field in a degenerate parametric oscillator below threshold, with spherical mirrors, was calculated, and the correlation is maximal between points opposite each other with respect to the axis of the system.
Abstract: We calculate the normal and time ordered spatial intensity correlation function of the signal field in a degenerate parametric oscillator below threshold, with spherical mirrors. In the far field, it exhibits a two peak structure, and the correlation is maximal between points opposite each other with respect to the axis of the system. This feature provides direct spatial evidence of the twin photon emission, and identifies states of the radiated field with local nonclassical squeezing properties.
28 citations
TL;DR: In this paper, the effects of higher-order, chi ((3)) nonlinearities on the process of second-harmonic generation were investigated in the traveling-wave case and they found substantive differences in the macroscopic behavior of the fields when the chi((3)) components are present.
Abstract: We investigate the effects of higher-order, chi ((3)), nonlinearities on the process of second-harmonic generation. In the traveling-wave case we find substantive differences in the macroscopic behavior of the fields when the chi ((3)) components are present. In the intracavity cage, which has been investigated before using a Linearized analysis, we investigate regions where these analyses may not be valid, comparing and contrasting the full quantum simulations with previous results.
28 citations
TL;DR: In this article, the authors demonstrate that spin exchange dephasing of Larmor precession at near-Earth-scale fields is effectively eliminated by dressing the alkali-metal atom spins in a sequence of ac-coupled $2\ensuremath{pi}$ pulses, repeated at the Larmour precession frequency.
Abstract: We demonstrate that spin-exchange dephasing of Larmor precession at near-Earth-scale fields is effectively eliminated by dressing the alkali-metal atom spins in a sequence of ac-coupled $2\ensuremath{\pi}$ pulses, repeated at the Larmor precession frequency. The contribution of spin-exchange collisions to the spectroscopic linewidth is reduced by a factor of the duty cycle of the pulses. We experimentally demonstrate resonant transverse pumping in magnetic fields as high as 0.1 G, present experimental measurements of the suppressed spin-exchange relaxation, and show enhanced magnetometer response relative to a light-narrowed scalar magnetometer.
28 citations
TL;DR: The performance characteristics of a doubly (signal and idler) resonant continuous-wave optical parametric oscillator based on periodically poled lithium niobate and pumped by a 100-mW single-mode laser diode at 810 nm are reported.
Abstract: The performance characteristics of a doubly (signal and idler) resonant continuous-wave optical parametric oscillator based on periodically poled lithium niobate and pumped by a 100-mW single-mode laser diode at 810 nm are reported. Pump power thresholds as low as 16 mW and wavelength tuning over the range 1.15–1.25 µm at the signal and 2.31–2.66 µm at the idler were achieved through variation of crystal temperature, pump wavelength, and grating period. Up to 5 mW of signal output was obtained with the single-mode diode pump, and signal powers of up to 39 mW were obtained when pumping with a 400-mW injection-locked broad-area diode laser.
28 citations
01 Jan 2006
TL;DR: In this article, it was shown that systems that exhibit bifurcational buckling under static conditions are subject to parametric excitation. But the load is parametric with respect to certain deformation forms, which is different from the usual forced vibration resonance.
Abstract: Publisher Summary
The term dynamic stability encompasses many classes of problems and many different physical phenomena; in some instances, the term is used for two distinctly different responses for the same configuration subject to the same dynamic loads. The class of problems falling in the category of parametric excitation, or parametric resonance, includes the best defined, conceived, and understood problems of dynamic stability. Examples of parametric resonance include a thin flat plate parametrically loaded by inplane forces, which may cause transverse plate vibrations; parametrically loaded shallow arches (symmetric loading), which under certain conditions vibrate asymmetrically with increasing amplitude; and long cylindrical, thin shells (or thin rings) under uniform but periodically applied pressure that can excite vibrations in an asymmetric mode. Thus, in parametric excitation, the loading is parametric with respect to certain deformation forms. This makes parametric resonance different from the usual forced vibration resonance. Based on these examples, it is realized that systems that exhibit bifurcational buckling under static conditions (regardless of whether the bifurcating static equilibrium branch is stable or unstable) are subject to parametric excitation. Moreover, there exists a large class of problems for which the load is applied statically but the system is nonconservative.
28 citations