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Exploring nonlinear pulse propagation, Raman frequency conversion and near octave spanning supercontinuum generation in atmospheric air-filled hollow-core Kagomé fiber

Abokhamis Mousavi, Seyedmohammad, Mulvad, Hans, Wheeler, Natalie, Horak, Peter, Bradley, Thomas, Alam, Shaif-Ul, Hayes, John, Sandoghchi, Seyed Reza, Richardson, David and Poletti, Francesco, (2017) Exploring nonlinear pulse propagation, Raman frequency conversion and near octave spanning supercontinuum generation in atmospheric air-filled hollow-core Kagomé fiber Vodopyanov, Konstantin L. and Schepler, Kenneth L. (eds.) In Nonlinear Frequency Generation and Conversion: Materials and Devices XVI. vol. 10088, SPIE. 10 pp, pp. 1-10. (doi:10.1117/12.2253706).

Record type: Conference or Workshop Item (Paper)

Abstract

We have demonstrated Raman frequency conversion and supercontinuum light generation in a hollow core Kagomé fiber filled with air at atmospheric pressure, and developed a numerical model able to explain the results with good accuracy. A solid-state disk laser was used to launch short pulses (~6ps) at 1030nm into an in-house fabricated hollow core Kagomé fiber with negative core curvature and both ends were open to the atmosphere. The fiber had a 150 THz wide transmission window and a record low loss of ~12 dB/km at the pump wavelength. By gradually increasing the pulse energy up to 250 µJ, we observed the onset of different Kerr and Raman based optical nonlinear processes, resulting in a supercontinuum spanning from 850 to 1600 nm at maximum input power. In order to study the pulse propagation dynamics of the experiment, we used a generalized nonlinear Schrödinger equation (GNLSE). Our simulations showed that the use of a conventional damping oscillator model for the time-dependent response of the rotational Raman component of air was not accurate enough at such high intensities and large pulse widths. Therefore, we adopted a semiquantum Raman model for air, which included the full rotational and vibrational response, and their temperature-induced broadening. With this, our GNLSE results matched well the experimental data, which allowed us to clearly identify the nonlinear phenomena involved in the process. Aside from the technological interest in the high spectral density of the supercontinuum demonstrated, the validated numerical model can provide a valuable optimization tool for gas based nonlinear processes in air-filled fibers.

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Accepted/In Press date: 27 September 2016
Published date: 20 February 2017
Venue - Dates: SPIE Photonics West, San Francisco, United States, 2017-01-30 - 2017-02-01

Identifiers

Local EPrints ID: 413372
URI: http://eprints.soton.ac.uk/id/eprint/413372
ISSN: 0277-786X
PURE UUID: 6a320607-4923-474d-bedb-a0a3f5f05853
ORCID for Hans Mulvad: ORCID iD orcid.org/0000-0003-2552-0742
ORCID for Natalie Wheeler: ORCID iD orcid.org/0000-0002-1265-9510
ORCID for Peter Horak: ORCID iD orcid.org/0000-0002-8710-8764
ORCID for Seyed Reza Sandoghchi: ORCID iD orcid.org/0000-0003-2196-3167
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083

Catalogue record

Date deposited: 23 Aug 2017 16:31
Last modified: 23 Aug 2017 16:31

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Contributors

Author: Hans Mulvad ORCID iD
Author: Natalie Wheeler ORCID iD
Author: Peter Horak ORCID iD
Author: Thomas Bradley
Author: Shaif-Ul Alam
Author: John Hayes
Editor: Konstantin L. Vodopyanov
Editor: Kenneth L. Schepler

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