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Experimental and theoretical investigation of fiber ring laser dynamics and transient analysis

Vijayraghavan, K. and Stewart, G. (2004) Experimental and theoretical investigation of fiber ring laser dynamics and transient analysis. In: 7th International Conference on Optoelectronics, Fiber Optics and Photonics, 2004-12-08 - 2004-12-11.

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Abstract

We report the experimental and theoretical studies on the dynamics of a fiber ring laser system which contains a length of erbium doped fiber pumped at 980nm connected to a fiber loop consisting of a micro-optic gas cell and a tunable bandpass filter. Due to a long loop length ~60m of the system, the number of cavity modes present in the 1nm filter bandwidth is extremely large. As a result, the effect of spontaneous emission into these laser modes plays an important role in determining the dynamics of the laser. A theoretical model which incorporates the effect of spontaneous emission into multiple laser modes is described and it is shown to be in agreement with experimental results obtained. A detailed analysis has been performed on the relaxation oscillations induced during the transient operation of the laser with the aim of using it as a tool for obtaining laser parameters