We report on experimental studies of coherence and fluctuations in noise-like pulse trains generated by ultrafast fiber oscillators. By measuring the degree of first-order coherence using a Young’s-type interference experiment, we prove the lack of phase coherence across the seemingly regular array of pulses. We further quantify the pulse-to-pulse fluctuations by recording the single-shot spectra of the megahertz pulse train, and experimentally demonstrate the existence of spectral fluctuations that remain unresolved in conventional time-averaged ensemble measurements. Phase incoherence and spectral fluctuations are contrasted with quantified coherence and spectral stability when the laser is soliton mode-locked.
© 2013 Optical Society of AmericaFull Article | PDF Article
Antoine F. J. Runge, Claude Aguergaray, Neil G. R. Broderick, and Miro Erkintalo
Opt. Lett. 39(2) 319-322 (2014)
Antoine F. J. Runge, Neil G. R. Broderick, and Miro Erkintalo
Optica 2(1) 36-39 (2015)
Jun Liu, Yu Chen, Pinghua Tang, Changwen Xu, Chujun Zhao, Han Zhang, and Shuangchun Wen
Opt. Express 23(5) 6418-6427 (2015)