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Experimental stability diagram of a diode laser subject to weak phase-conjugate feedback from a rubidium vapor cell

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6 Author(s)
Andersen, O.K. ; Fac. of Sci., Vrije Univ., Amsterdam, Netherlands ; Fischer, A.P.A. ; Lane, I.C. ; Louvergneaux, E.
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We report on a systematic experimental investigation of the dynamical behavior of a diode laser subject to delayed feedback from a phase-conjugating mirror based on nearly-degenerate four-wave mixing in rubidium vapor. We present the first experimental stability diagram for this system. In the weak feedback regime, with feedback levels up to -30 dB, me demonstrate locking to the pump frequency with a reduced linewidth smaller than 8 MHz. In contrast to a laser with external injection, and contrary to predictions made for phase-conjugate feedback, the extent of this locking region is found to be limited. For increased feedback rates, the laser leaves the locking region and enters an unstable region through a series of multiple sidebands spectra. This is associated with self-excitation of the relaxation oscillation, and the observed scenario suggests a series of period-doublings after an initial Hopf bifurcation

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Quantum Electronics, IEEE Journal of  (Volume:35 ,  Issue: 4 )