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Generalised ultrafast dispersion scans of continuum generation induced by sub-50fs chirped pulses in highly nonlinear tapered planar waveguides

Praeger, Matthew, Brocklesby, William S., de Paula, Ana M., Frey, Jeremy, Baumberg, Jeremy J., Netti, Caterina M., Zoorob, Majd E., Perney, Nicholas M.B., Charlton, Martin D.B., Roberts, Stephen W., Wilkinson, James S., Parker, Gregory J. and Lincoln, John R. (2005) Generalised ultrafast dispersion scans of continuum generation induced by sub-50fs chirped pulses in highly nonlinear tapered planar waveguides At SPIE 5714 : Commercial and Biomedical Applications of Ultrafast Lasers V. 24 - 27 Jan 2005. 8 pp. (doi:10.1117/12.589346).

Record type: Conference or Workshop Item (Paper)


Ultra-high bandwidth continua generated by ultrashort fs pulses have been attracting enormous interest for applications such as general spectroscopy, Optical Coherence Tomography and metrology. Dispersion engineering is one of the key aspects of optimised continuum generation in optical waveguides. However in addition, the dispersion of the pump pulse can be continuously adapted to control bandwidth and spectral characteristics of the generated continua. In this work we report on a systematic investigation of how 2nd,and 3rd order dispersion affects the continuum generated in strongly non linear planar waveguides. A ~30 fs Ti:Sapphire tuned to 800 nm was used as a pump source delivering ~3 nJ pulses. The chirp of the pulses was controlled completely-arbitrarily by an acousto-optic programmable dispersive filter (Dazzler). The power launched into the structures was kept constant to compare the generated continua as the pulse dispersion is varied. High refractive index tantalum pentoxide waveguides grown by standard silicon processing techniques were used. The devices investigated were specially designed tapered ridges with ~5mm^2 input modal volume and zero group velocity dispersion at ~1-3.7 mm. Self-phase modulation, which is responsible for the spectral broadening of the continua, is tracked by finely tuning the both 2nd and 3rd order dispersions. The nonlinear propagation is dramatically influenced by the simultaneous presence of these dispersive effects resulting in a change of bandwidth and spectral shape. Pulse widths of up to D1 > 100 nm for launched powers as low as 300 pJ. Spectral peak intensity can also be systematically modulated by simply scanning the 2nd and 3rd order dispersion around their relative zeros. Specific combinations of high order dispersion contribution are currently targeted as a route to control and optimise the continua bandwidths and to control dispersion lengths in specifically engineered waveguides.

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e-pub ahead of print date: 21 March 2005
Venue - Dates: SPIE 5714 : Commercial and Biomedical Applications of Ultrafast Lasers V, 2005-01-24 - 2005-01-27


Local EPrints ID: 57553
ISBN: 9780819456885
PURE UUID: 306f3915-77e2-4bc8-b8d3-63e80ac91643
ORCID for William S. Brocklesby: ORCID iD
ORCID for Jeremy Frey: ORCID iD
ORCID for James S. Wilkinson: ORCID iD

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Date deposited: 15 Aug 2008
Last modified: 17 Jul 2017 14:29

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Author: Matthew Praeger
Author: Ana M. de Paula
Author: Jeremy Frey ORCID iD
Author: Jeremy J. Baumberg
Author: Caterina M. Netti
Author: Majd E. Zoorob
Author: Nicholas M.B. Perney
Author: Martin D.B. Charlton
Author: Stephen W. Roberts
Author: Gregory J. Parker
Author: John R. Lincoln

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