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Proceedings Paper

Exploring nonlinear pulse propagation, Raman frequency conversion and near octave spanning supercontinuum generation in atmospheric air-filled hollow-core Kagomé fiber
Author(s): Seyedmohammad Abokhamis Mousavi; Hans Christian Hansen Mulvad; Natalie Wheeler; Peter Horak; Thomas D. Bradley; Shaif-ul Alam; John Hayes; Seyed Reza Sandoghchi; David Richardson; Francesco Poletti
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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.

Paper Details

Date Published: 20 February 2017
PDF: 10 pages
Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 100880G (20 February 2017); doi: 10.1117/12.2253706
Show Author Affiliations
Seyedmohammad Abokhamis Mousavi, Univ. of Southampton (United Kingdom)
Hans Christian Hansen Mulvad, Univ. of Southampton (United Kingdom)
Natalie Wheeler, Univ. of Southampton (United Kingdom)
Peter Horak, Univ. of Southampton (United Kingdom)
Thomas D. Bradley, Univ. of Southampton (United Kingdom)
Shaif-ul Alam, Univ. of Southampton (United Kingdom)
John Hayes, Univ. of Southampton (United Kingdom)
Seyed Reza Sandoghchi, Univ. of Southampton (United Kingdom)
David Richardson, Univ. of Southampton (United Kingdom)
Francesco Poletti, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 10088:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVI
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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