Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 45: Ultrashort Laser Pulses I

Q 45.4: Talk

Thursday, March 3, 2016, 11:45–12:00, a310

Mode-locking maps for a giant chirp oscillator — •Paul Repgen, Florian Schepers, Tim Hellwig, and Carsten Fallnich — University of Münster, Institute of Applied Physics, Corrensstraße 2, 48149 Münster

We present a systematic and fully-automated characterization method to analyze the possible output states of a giant chirp oscillator (GCO)¹. Our GCO is a long-cavity (2.6 MHz repetition rate, 6.6 nJ pulse energy) Ytterbium-doped fiber oscillator, mode-locked by a nonlinear amplifying loop mirror (NALM). An approximately 70 m long single-mode fiber in the resonator induces an up-chirp to the pulse due to normal dispersion, resulting in an output pulse with an autocorrelation duration of 133 ps which can be compressed to an autocorrelation duration of 169 fs using an external grating compressor. Within our examination, we scan the pump power of the amplifier fiber as well as the NALM and record the mean power, repetition rate, spectrum, and the pulse energy fluctuations of the different operation states. Based on these data mode-locking maps can be generated that can be subsequently used to directly compare different laser configurations (e.g. after changes of resonator length or output coupler position, etc.) and thereby allow to choose the optimal setup for the desired application.
¹ Erkintalo M., et al., Opt. Express 20, 22669 (2012).