We provide experimental evidence of super-harmonic self-pulsation in a laser diode with a phase-conjugate optical feedback (PCF), i.e., time-periodic nearly sinusoidal oscillating output power at a frequency being multiple of the external-cavity frequency that corresponds to the long-standing predictions of so-called “external-cavity mode” [G. P. Agrawal and J. T. Klaus, Opt. Lett. 16, 1325–1327 (1991)]. High-harmonic self-pulsations have been so far limited to configurations with long time-delay, hence to relatively small frequencies (<1–2 GHz). By contrast, the reported self-pulsating solutions from PCF are stable in a larger range of feedback strength and with higher-order harmonic number when decreasing the external-cavity time-delay.
Super-harmonic self-pulsations from a time-delayed phase-conjugate optical system
Andreas Karsaklian Dal Bosco, Delphine Wolfersberger, Marc Sciamanna; Super-harmonic self-pulsations from a time-delayed phase-conjugate optical system. Appl. Phys. Lett. 25 August 2014; 105 (8): 081101. https://doi.org/10.1063/1.4894119
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