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 authors describe a mechanism for pulse compression in a length-detuned synchronously pumped optical parametric oscillator, and show that the compression is due to group-velocity walk-off combined with parametric gain depletion.
Abstract: We describe a mechanism for pulse compression in a length-detuned synchronously pumped optical parametric oscillator. Our model shows that the compression is due to group-velocity walk-off combined with parametric gain depletion. We find excellent agreement between the results of our model and the experimentally observed behavior of our synchronously pumped optical parametric oscillator, including the prediction and the observation of as much as 20-fold compression. Using our model as a basis, we describe the possibilities and the limitations of this technique for generating broadly tunable femtosecond pulses.
36 citations
TL;DR: Single longitudinal mode operation of an optical parametric oscillator has been achieved using a low loss, mode-matched interferometer as a mode selector to obtain bandwidths of 0.001 cm-1 in the region of 2.5 μm.
36 citations
TL;DR: In this paper, the damping theory is correctly applied to the coupled systems in contact with respective reservoirs, and differences between the present rigorous treatment of the dampening theory and the conventional one are explicitly shown for an exactly solvable model of the parametric amplifier.
Abstract: The damping theory is correctly applied to the coupled systems in contact with respective reservoirs. Differences between the present rigorous treatment of the damping theory and the conventional one are explicitly shown for an exactly solvable model of the parametric amplifier. The deviation becomes significant as the transition point of the system is approached. The conventional treatment breaks down for a description of a certain physical quantity even in the weak coupling limit. A possible method is suggested to treat more complicated systems like laser.
36 citations
TL;DR: In this article, the exact solution for the problem of a harmonic oscillator of frequency and mass was extended to include the effect of a driving force, and the corresponding quasienergies are finite.
Abstract: The exact solution for the problem of a harmonic oscillator of frequency ${\ensuremath{\omega}}_{0}$ and mass ${M}_{0}$ ${\mathrm{cos}}^{2}$(\ensuremath{
u}t) is extended to include the effect of a driving force ${M}_{0}$${f}_{0}$ cos(\ensuremath{\lambda}t+\ensuremath{\varphi}). With \ensuremath{\varphi}\ensuremath{
e}0, catastrophic resonances occur when \ensuremath{\lambda}=(${\ensuremath{\omega}}_{0}^{2}$+${\ensuremath{
u}}^{2}$${)}^{1/2}$\ifmmode\pm\else\textpm\fi{}\ensuremath{
u}. Pseudoperiodic states exist, provided that \ensuremath{\lambda}=${\ensuremath{\omega}}_{0}$ and \ensuremath{\lambda},\ensuremath{
u} are commensurate. The corresponding quasienergies are finite in the cases \ensuremath{\varphi}=\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2.
36 citations
TL;DR: In this paper, a three-wave mixing pathway in a system of two-and three-coupled phonon modes has been demonstrated, which points to the possibility of multimode frequency combs.
Abstract: This paper is motivated by the recent demonstration of a phononic frequency comb. While previous experiments have shown the existence of a three-wave mixing pathway in a system of two-coupled phonon modes, this work demonstrates a similar pathway in a system of three-coupled phonon modes. This paper also presents a number of interesting experimental facts concomitant to the three-mode parametric resonance based frequency comb observed in a specific micromechanical device. The experimental validation of frequency combs via three-mode parametric resonance along with the previous demonstration of two-mode frequency combs points to the ultimate possibility of multimode frequency combs.
36 citations