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Proceedings Paper

Four-wave mixing UV generation in optical microfibers
Author(s): Muhammad I. M. Abdul Khudus; Francesco De Lucia; Costantino Corbari; Timothy Lee; Peter Horak; Pier Sazio; Gilberto Brambilla
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Paper Abstract

UV generation via four-wave-mixing (FWM) in optical microfibres (OMFs) was demonstrated. This was achieved by exploiting the tailorable dispersion of the OMF in order to phase match the propagation constant of the four frequencies involved in the FWM process. In order to satisfy the frequency requirement for FWM, a Master Oscillator Power Amplifier (MOPA) working at the telecom C-band was connected to a periodically poled silica fibre (PPSF), producing a fundamental frequency (FF) at 1550.3 nm and a second harmonic (SH) frequency at 775.2 nm. A by-product of this second harmonic generation is the generation of a signal at the third harmonic (TH) frequency of 516.7 nm via degenerate FWM. This then allows the generation of the fourth harmonic (FH) at 387.6 nm and the fifth harmonic (5H) at 310nm via degenerate and nondegenerate FWM in the OMF.The output of the PPSF was connected to a pure silica core fibre which was being tapered using the modified flame brushing technique from an initial diameter of 125 μm to 0.5 μm. While no signal at any UV wavelength was initially observed, as the OMF diameter reached the correct phase matching diameters, signals at 387.6 nm appeared. Signals at 310 nm also appeared although it is not phase matched, as the small difference in the propagation constant is bridged by other nonlinear processes such as self-phase and cross phase modulation.

Paper Details

Date Published: 27 April 2016
PDF: 6 pages
Proc. SPIE 9894, Nonlinear Optics and its Applications IV, 98941I (27 April 2016); doi: 10.1117/12.2227585
Show Author Affiliations
Muhammad I. M. Abdul Khudus, Univ. of Southampton (United Kingdom)
Univ. of Malaya (Malaysia)
Francesco De Lucia, Univ. of Southampton (United Kingdom)
Costantino Corbari, Univ. of Southampton (United Kingdom)
Renishaw plc (United Kingdom)
Timothy Lee, Univ. of Southampton (United Kingdom)
Peter Horak, Univ. of Southampton (United Kingdom)
Pier Sazio, Univ. of Southampton (United Kingdom)
Gilberto Brambilla, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 9894:
Nonlinear Optics and its Applications IV
Benjamin J. Eggleton; Neil G. R. Broderick; Alexander L. Gaeta, Editor(s)

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