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Feedback effects at stable and unstable resonant external cavity lengths

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4 Author(s)
A. S. van de Nes ; Delft Univ. of Technol., Netherlands ; J. J. H. B. Schleipen ; G. W. t'Hooft ; M. P. van Exter

External feedback applied to a high-power semiconductor laser is found to be responsible for a drop in output power and an increased noise-level when the optical external cavity length is an integral multiple of the optical internal cavity length. The power drops and extra noise originates from a scan of the quasi-single-mode laser over its internal cavity modes, caused by a lack of interferometric stability. In the case of interferometric stability, the wavelength of the laser exhibits a staircase-like dependence on the external cavity length. All experimental results can be described by a simple rate equation model.

Published in:

IEEE Journal of Quantum Electronics  (Volume:38 ,  Issue: 8 )