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Giant subthreshold amplification in synchronously pumped optical parametric oscillators

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
1050-2947
23804
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Papoff, Francesco
c845380e-f3e9-4c20-9d6c-0b7a66918174
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), 23804. (doi:10.1103/PhysRevA.80.023804).

Record type: Article

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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More information

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
ORCID for Giampaolo D'Alessandro: ORCID iD orcid.org/0000-0001-9166-9356

Catalogue record

Date deposited: 12 Aug 2009
Last modified: 09 Jan 2022 02:47

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Contributors

Author: Francesco Papoff

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