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Proceedings Paper

Pulsating instabilities and chaos in Raman lasers
Author(s): Robert G. Harrison; Weiping Lu; K. Jiad; J. S. Uppal
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Paper Abstract

. The results of a theoretical and experimental investigation of the steady state and dynamical unstable behaviour of a single-mode homogeneously broadened Raman laser is presented. Bistable features of the Raman emission and its operating conditions are determined. Parameterisation of the dynamical behaviour shows instabilities to exist over a broad range of operating conditions and for broad cavity detuning to the low frequency side of the gain-centre where the bistable emission also prevails. Notably period doubling routes to chaos and sustained oscillatory behaviour are found to occur. Single mode homogeneously broadened Raman lasers which are equivalent to far off-resonantly pumped three level lasers are mathematically reducible to a simple description similar to that for a detuned two level laser''. The Raman system is however physically quite distinct involving a two photon rather than a one photon interaction between levels in a non-inverted rather than an inverted state. Significantly these differences lead to considerably relaxed operating conditions for the emergence of instabilities compared to those for the two level laser. Periodic chaotic and bistable behaviour for the Raman laser has been identified occurring at or close to the first lasing threshold and asymmetrically with respect to the gain centre. Further instabilities were found to be most prevalent at or close to conditions for optimum lasing. As such these systems provide excellent opportunity for quantitative tests of nonlinear dynamics both through their simple

Paper Details

Date Published: 1 March 1991
PDF: 9 pages
Proc. SPIE 1376, Laser Noise, (1 March 1991); doi: 10.1117/12.48062
Show Author Affiliations
Robert G. Harrison, Heriot-Watt Univ. (United Kingdom)
Weiping Lu, Heriot-Watt Univ. (United Kingdom)
K. Jiad, Heriot-Watt Univ. (United Kingdom)
J. S. Uppal, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 1376:
Laser Noise
Rajarshi Roy, Editor(s)

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