Mapping the dynamical regimes of a SESAM mode-locked VECSEL with long cavity using time series analysis

Malica, Tushar and Lin, Jipeng and Ackemann, Thorsten and Little, Douglas J. and Toomey, Joshua P. and Paboeuf, David and Lubeigt, Walter and Hempler, Nils and Malcom, G and Maker, Gareth T. and Kane, Deborah M. (2018) Mapping the dynamical regimes of a SESAM mode-locked VECSEL with long cavity using time series analysis. Optics Express, 26 (13). pp. 16624-16638. ISSN 1094-4087 (https://doi.org/10.1364/OE.26.016624)

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Abstract

The different dynamical regions of an optically-pumped SESAM mode-locked, long-cavity VECSEL system with a fundamental pulse repetition frequency of ~200 MHz are investigated. The output power, captured as 250 μs long time series using a sampling rate of 200 GSa/s, for each operating condition of the system, is analyzed to determine the dynamical state. A wavelength range of 985-995 nm and optical pump powers of 10 W-16.3 W is studied. The system produces high quality fundamental passive mode-locking (FML) over an extensive part of the parameter space, but the different dynamical regions outside of FML are the primary focus of this study. We report five types of output: CW emission, FML, modelocking of a few modes, double pulsing, and, semi-stable 4th harmonic mode-locking. The high sampling rate of the oscilloscope, combined with the long duration of the time series analyzed, enables insight into how the structure and substructure of pulses vary systematically over thousands of round trips of the laser cavity. Higher average output power is obtained in regions characterized by semi-stable 4th harmonic mode-locking than observed for FML, raising whether such average powers might be achieved for FML. The observed dynamical transitions from fundamental mode-locking provide insights into instability challenges in developing a stable, widely tunable, low repetition rate, turn-key system; and to inform future modelling of the system.

ORCID iDs

Malica, Tushar, Lin, Jipeng, Ackemann, Thorsten ORCID logoORCID: https://orcid.org/0000-0003-2727-7395, Little, Douglas J., Toomey, Joshua P., Paboeuf, David ORCID logoORCID: https://orcid.org/0000-0001-5664-994X, Lubeigt, Walter, Hempler, Nils, Malcom, G, Maker, Gareth T. and Kane, Deborah M.;
  • Item type:Article
    ID code:64495
    Dates:
    Date
    Event
    25 June 2018
    Published
    14 June 2018
    Published Online
    7 June 2018
    Accepted
    2018
    Submitted
    Notes:© 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Jun 2018 11:34
    Last modified:11 Nov 2024 12:01
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/64495
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