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31 October 2016 RF spectral analysis for characterisation of mode-locked regimes in fibre lasers
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In this work, we present our results of RF spectral analysis applied to mode-locked lasers and propose a method of qualitative assessment of mode-locked operation, which allows differentiation of individual generation regimes by a parameter calculated from RF spectra of the fundamental and the n-th radiation harmonics. The proposed parameter is derived both from the signal-to-noise ratio and from width and amount of additional noise present in RF spectrum of inter-mode beats at the fundamental pulse repetition frequency and its harmonic. This work presents analysis of energy fluctuations and temporal instability of pulse train period for different regimes of pulse generation in Yb fibre laser mode locked due to nonlinear polarization evolution. The paper shows that energy fluctuations of single-scale (“conventional”) pulses is about 1.6%, whereas for double-scale pulses energy fluctuations amount to 11.5%. Temporal instability of double-scale pulse train period is 1.5 times higher in comparison with single-scale pulse train period.
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Alexey V. Ivanenko, Sergey M. Kobtsev, Alexey Kokhanovskiy, and Sergey V. Smirnov "RF spectral analysis for characterisation of mode-locked regimes in fibre lasers", Proc. SPIE 10019, Optoelectronic Devices and Integration VI, 100191F (31 October 2016);

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