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Exotic behavior in quantum dot mode-locked lasers: dark pulses and bistability



Kevin L. Silverman, Mingming M. Feng, Richard P. Mirin, Steven T. Cundiff


Passively mode-locked semiconductor lasers with self-assembled quantum dot active regions can be operated in exotic output modes, stabilized by the complex gain and absorption dynamics inherent in these structures. One such device emits dark pulses - sharp dips on an otherwise stable continuous wave background-in an extended cavity design. We show that a dark pulse train is a solution to the master equation for mode-locked lasers and perform numerical modeling to test the stability of such a solution. A separate, monolithic design displays wavelength bistability and can be electrically switched between these two modes within just a few cavity round trips. This device can be made to switch between two stable wavelengths separated by just 7 nm up to over 40 nm with a contrast ratio of over 40 dB.
Lecture Notes in Nanoscale Science and Technology
Publisher Info
Springer, New York, NY


quantum dots, mode-locking, bistability, dark pulses


Silverman, K. , Feng, M. , Mirin, R. and Cundiff, S. (2012), Exotic behavior in quantum dot mode-locked lasers: dark pulses and bistability, Lecture Notes in Nanoscale Science and Technology, Springer, New York, NY, [online], (Accessed July 21, 2024)


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Created May 24, 2012, Updated June 2, 2021