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Correlation properties and drift phenomena in the dynamics of vertical-cavity surface-emitting lasers with optical feedback

Sondermann, M. and Ackemann, T. (2005) Correlation properties and drift phenomena in the dynamics of vertical-cavity surface-emitting lasers with optical feedback. Optics Express, 13 (7). pp. 2707-2715. ISSN 1094-4087

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Abstract

We investigate experimentally the polarization dynamics of vertical-cavity surface-emitting lasers with isotropic optical feedback operating in the long-cavity regime. By means of an analysis of the correlation properties in the time domain and in the frequency domain a connection between a drift phenomenon and frequency components that deviate from the harmonics of the external cavity round-trip frequency is revealed. The latter frequency components are shown to result from an interaction of external cavity dynamics and relaxation oscillations. An analogy to the carrier-envelope effect in mode-locked lasers is drawn. Similar drift phenomena are observed also for other laser systems with delay.