Giant subthreshold amplification in synchronously pumped optical parametric oscillators
Giant subthreshold amplification in synchronously pumped optical parametric oscillators
Synchronously pumped parametric oscillators have been shown to have subthreshold giant amplification of such a magnitude that a macroscopic, entirely noise-driven, signal is present at output even when the device is below threshold. In this paper we quantify the magnitude of the amplification factor in terms of some key device parameters. We use non-normal operator theory to find the noise amplification factor (Kreiss constant) and show that the signal amplitude is proportional to it. We also determine that the noise sensitivity depends in a nontrivial way on the group velocity of the three fields.
sub-threshold amplification, noise sensitivity, pseudospectra, nonnormal operators
23804
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Papoff, Francesco
c845380e-f3e9-4c20-9d6c-0b7a66918174
August 2009
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Papoff, Francesco
c845380e-f3e9-4c20-9d6c-0b7a66918174
D'Alessandro, Giampaolo and Papoff, Francesco
(2009)
Giant subthreshold amplification in synchronously pumped optical parametric oscillators.
Physical Review A, 80 (2), .
(doi:10.1103/PhysRevA.80.023804).
Abstract
Synchronously pumped parametric oscillators have been shown to have subthreshold giant amplification of such a magnitude that a macroscopic, entirely noise-driven, signal is present at output even when the device is below threshold. In this paper we quantify the magnitude of the amplification factor in terms of some key device parameters. We use non-normal operator theory to find the noise amplification factor (Kreiss constant) and show that the signal amplitude is proportional to it. We also determine that the noise sensitivity depends in a nontrivial way on the group velocity of the three fields.
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Published date: August 2009
Keywords:
sub-threshold amplification, noise sensitivity, pseudospectra, nonnormal operators
Identifiers
Local EPrints ID: 67258
URI: http://eprints.soton.ac.uk/id/eprint/67258
ISSN: 1050-2947
PURE UUID: 8d346b79-91b6-4341-a1e5-7c3cd9bf4f08
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Date deposited: 12 Aug 2009
Last modified: 14 Mar 2024 02:38
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Author:
Francesco Papoff
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