The hypothesis of the moving comb in frequency shifted feedback lasers

H. Guillet de Chatellus 1 E. Lacot 1 W. Glastre 1 O. Jacquin 2 O. Hugon 1
1 LIPhy-OPTIMA
LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
2 LI¨Phy-OPTIMA
LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
Abstract : The use of frequency-shifted feedback (FSF) lasers in optical metrology is based on a unique coherence property: the appearance of beats in the noise spectrum at the output of a two-beam interferometer, whose frequencies vary linearly with the path delay of the interferometer. A description of the output of a FSF laser as a moving comb of optical frequencies is generally admitted to explain these specific coherence properties. Here starting from the model of a passive FSF cavity seeded by spontaneous emission we give a rigorous description of the time-spectrum properties of FSF lasers and show that the moving comb exists only in the limit of small frequency shift.
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H. Guillet de Chatellus, E. Lacot, W. Glastre, O. Jacquin, O. Hugon. The hypothesis of the moving comb in frequency shifted feedback lasers. Optics Communications, Elsevier, 2011, 284, pp.4965-4970. ⟨10.1016/J.OPTCOM.2011.06.042⟩. ⟨hal-00951867⟩

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