Temporal fine structure of all-normal dispersion fiber supercontinuum pulses caused by non-ideal pump pulse shapes

Rampur, Anupamaa; Spangenberg, Dirk-Mathys; Stępniewski, Grzegorz; Dobrakowski, Dominik; Tarnowski, Karol; Stefańska, Karolina; Paździor, Adam; Mergo, Paweł; Martynkien, Tadeusz; Feurer, Thomas; Klimczak, Mariusz; Heidt, Alexander M. (2020). Temporal fine structure of all-normal dispersion fiber supercontinuum pulses caused by non-ideal pump pulse shapes. Optics express, 28(11), pp. 16579-16593. Optical Society of America 10.1364/OE.392871

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We experimentally investigate the spectro-temporal characteristics of coherent supercontinuum (SC) pulses generated in several implementations of silica and soft-glass all-normal dispersion (ANDi) photonic crystal fibers optimized for pumping with Erbium (Er):fiber femtosecond laser technology. We characterize the resulting SC using time-domain ptychography, which is especially suitable for the measurement of complex, spectrally broadband ultrashort pulses. The measurements of the ANDi SC pulses reveal intricate pulse shapes, considerable temporal fine structure, and oscillations on time scales of < 25 femtoseconds, which differ from the smoothness and simplicity of temporal profiles obtained in numerical simulations and observed in previous experiments. We link the measured complex features to temporal sub-structures of the pump pulse, such as pre- and post-pulses and low-level pedestals, which are common in high pulse energy ultrafast Er:fiber systems. We also observe spectro-temporal structures consistent with incoherent noise amplification in weakly birefringent fiber samples. Our results highlight the importance of the pump source and polarization-maintaining (PM) fibers for high-quality SC generation and have practical relevance for many ultrafast photonics applications employing ANDi fiber-based SC sources.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Lasers

UniBE Contributor:

Spangenberg, Dirk-Mathys; Feurer, Thomas and Heidt, Alexander

Subjects:

500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

1094-4087

Publisher:

Optical Society of America

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Alexander Heidt

Date Deposited:

05 Jun 2020 09:05

Last Modified:

05 Jun 2020 09:27

Publisher DOI:

10.1364/OE.392871

Related URLs:

BORIS DOI:

10.7892/boris.144494

URI:

https://boris.unibe.ch/id/eprint/144494

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