Single-shot spectroscopy of broadband Yb fiber laser

Masayuki Suzuki; Shin Yoneya; Hiroto Kuroda

doi:10.1117/12.2255945

22 February 2017 Single-shot spectroscopy of broadband Yb fiber laser

Masayuki Suzuki, Shin Yoneya, Hiroto Kuroda

Author Affiliations +

Proceedings Volume 10089, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications II; 1008905 (2017) https://doi.org/10.1117/12.2255945
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

We have experimentally reported on a real-time single-shot spectroscopy of a broadband Yb-doped fiber (YDF) laser which based on a nonlinear polarization evolution by using a time-stretched dispersive Fourier transformation technique. We have measured an 8000 consecutive single-shot spectra of mode locking and noise-like pulse (NLP), because our developed broadband YDF oscillator can individually operate the mode locking and NLP by controlling a pump LD power and angle of waveplates. A shot-to-shot spectral fluctuation was observed in NLP. For the investigation of pulse formation dynamics, we have measured the spectral evolution in an initial fluctuations of mode locked broadband YDF laser at an intracavity dispersion of 1500 and 6200 fs² for the first time. In both case, a build-up time between cw and steady-state mode locking was estimated to be 50 us, the dynamics of spectral evolution between cw and mode locking, however, was completely different. A shot-to-shot strong spectral fluctuation, as can be seen in NLP spectra, was observed in the initial timescale of 20 us at the intracavity dispersion of 1500 fs². These new findings would impact on understanding the birth of the broadband spectral formation in fiber laser oscillator.

Conference Presentation

Citation Download Citation

Masayuki Suzuki, Shin Yoneya, and Hiroto Kuroda "Single-shot spectroscopy of broadband Yb fiber laser", Proc. SPIE 10089, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications II, 1008905 (22 February 2017); https://doi.org/10.1117/12.2255945

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