Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 37: Ultrashort Laser Pulses

Q 37.2: Vortrag

Mittwoch, 11. März 2020, 14:15–14:30, f435

Nonlinear Pulse Compression in a Dispersion-Alternating Fiber — •Niklas M. Lüpken1 and Carsten Fallnich1,21Institute of Applied Physics, University of Münster, Corrensstraße 2, 48149 Münster, Germany — 2MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands

Based on the concept of alternating dispersion [1] we show improvements for nonlinearly compressing light pulses down to the few-cycle regime in a fiber chain with alternating dispersion.

Whereas the normally dispersive fiber segments generate bandwidth via self-phase modulation, the anomalously dispersive fiber segments recompress the broadened spectral bandwidth by an appropriate amount of group velocity dispersion. This approach avoids the use of free-space pulse compressors, the need for high pulse energies, or the precise control of the fiber length, whereas all these issues do represent drawbacks of current schemes. For shorter pulses, further pairs of fiber segments can be added with taking a trade-off between resulting peak power and unavoidable splicing losses into account.

In first experiments, nearly bandwidth-limited 25 fs pulses at 1560 nm were achieved from 80 fs input pulses, giving a pulse compression factor of 3.2. The use of a special anomalous dispersive fiber eliminated the impact of higher-order dispersion, such that a high spectral coherence was ensured. The results were in good agreement with nonlinear Schrödinger equation simulations, which also predicted that the concept is transferable to longer input pulses.

[1] Inoue et al., J. Light. Technol. 24, 2510 (2006).

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