Ultrafast response of active and self-starting harmonic mode-locked THz laser (Conference Presentation)

Valentino Pistore; Feihu Wang; Michael Riesch; Hanond Nong; Pierre-Baptiste Vigneron; Raffaele Colombelli; Olivier Parillaud; Juliette Mangeney; Jerome Tignon; Christian Jirauschek; Sukhdeep Dhillon

doi:10.1117/12.2546475

10 March 2020 Ultrafast response of active and self-starting harmonic mode-locked THz laser (Conference Presentation)

Valentino Pistore, Feihu Wang, Michael Riesch, Hanond Nong, Pierre-Baptiste Vigneron, Raffaele Colombelli, Olivier Parillaud, Juliette Mangeney, Jerome Tignon, Christian Jirauschek, Sukhdeep Dhillon

Author Affiliations +

Proceedings Volume 11288, Quantum Sensing and Nano Electronics and Photonics XVII; 112881U (2020) https://doi.org/10.1117/12.2546475
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Fundamental modelocking to generate short terahertz (THz) pulses and THz frequency combs from semiconductor lasers has become a routine affair using quantum cascade lasers (QCLs) as a gain medium. However, no demonstrations of harmonic modelocking have been shown in THz QCLs, where multiple pulses per round trip are generated when the laser is modulated at harmonics of the cavity’s fundamental round trip frequency. Here, using time resolved THz techniques, we show for the first time harmonic injection, and active and passive mode-locking where THz QCLs are modulated at harmonics of the round-trip frequency. Furthermore, using the unique ultrafast nature of our approach, we show that passive or self-starting harmonic modelocking originates from the QCL self-generating a harmonic microwave modulation. The latter auto-modulates the gain and loss in the system, spontaneously forcing the QCL to operate up to its 15th harmonic and opening up prospects of passive THz short pulse generation.

Conference Presentation

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Valentino Pistore, Feihu Wang, Michael Riesch, Hanond Nong, Pierre-Baptiste Vigneron, Raffaele Colombelli, Olivier Parillaud, Juliette Mangeney, Jerome Tignon, Christian Jirauschek, and Sukhdeep Dhillon "Ultrafast response of active and self-starting harmonic mode-locked THz laser (Conference Presentation)", Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112881U (10 March 2020); https://doi.org/10.1117/12.2546475

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KEYWORDS

Terahertz radiation

Quantum cascade lasers

Ultrafast phenomena

Mode locking

Modulation

Semiconductor lasers

Microwave radiation

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