Characterization of mode-locking in an all-fiber, all normal dispersion ytterbium based fiber oscillator

András Cserteg; Veronika Sagi; Andras Drozdy; Zoltán Varallyay; Gábor Gajdátsy

doi:10.1117/12.2079865

4 March 2015 Characterization of mode-locking in an all-fiber, all normal dispersion ytterbium based fiber oscillator

András Cserteg, Veronika Sagi, Andras Drozdy, Zoltán Varallyay, Gábor Gajdátsy

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 93442C (2015) https://doi.org/10.1117/12.2079865
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

An ytterbium based all fiber, all normal dispersion fiber oscillator with integrated SESAM can have several operation modes like mode-locked, Q-switched and noise-like. To know and to control the quality of the mode-locking is essential for the application of such laser oscillators, otherwise the whole laser setup can be damaged or the expected operation characteristics of the oscillator driven systems cannot be achieved. Usually the two-photon signal generated by the short pulses is used to indicate the mode locked operation, however such detection can be misleading in certain cases and not always able to predict the forthcoming degradation or vanishing of mode locking. The characterization method that we propose uses only the radio frequency spectrum of the oscillator output and can identify the different operation regimes of our laser setup. The optical spectra measured simultaneously with the RF signals proves the reliability of our method. With this kind of characterization stable mode locking can be initiated and maintained during the laser operation. The method combined with the ability to align the polarization states automatically in the laser cavity leads to the possibility to record a polarization map where the stability domains can be identified and classified. With such map the region where the mode locking is self starting and maintainable with minimal polarization alignment can be selected. The developed oscillator reported here with its compact setup and self alignment ability can be a reliable source with long term error free operation without the need of expensive monitoring tools.

Citation Download Citation

András Cserteg, Veronika Sagi, Andras Drozdy, Zoltán Varallyay, and Gábor Gajdátsy "Characterization of mode-locking in an all-fiber, all normal dispersion ytterbium based fiber oscillator", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93442C (4 March 2015); https://doi.org/10.1117/12.2079865

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KEYWORDS

Polarization

Mode locking

Oscillators

Ytterbium

Q switching

Continuous wave operation

Fiber lasers

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