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Laser Doppler velocimetry with polarization-bistable VCSELs

Albert, J.; Soriano, M.C.; Veretennicoff, I.; Panajotov, K.; Danckaert, J.; Porta, P.A.; Curtin, D.P.; McInerney, J.G.;
IEEE Journal of Selected Topics in Quantum Electronics 10, 1006-1012 (2004)

We present a rate equation model of a single mode vertical-cavity surface-emitting laser (VCSEL) with two states of linear polarization, subject to Doppler-shifted optical feedback. Recent experimental work has shown that the polarization bistability often observed in VCSELs can be exploited to enhance the responsivity of these semiconductor lasers in speed-sensing applications. We review these experimental results briefly and use the rate equation model to explain the increased signal-to-noise ratio.