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Spectral evolution of femtosecond pulses in nonlinear waveguides: measuring continuum generation and group velocity with NSOM

Spectral evolution of femtosecond pulses in nonlinear waveguides: measuring continuum generation and group velocity with NSOM
Spectral evolution of femtosecond pulses in nonlinear waveguides: measuring continuum generation and group velocity with NSOM
We describe spectral measurements using NSOM of the nonlinear propagation of femtosecond pulses in waveguides. Nonlinearity produces self phase modulation, which broadens the spectrum of the propagating light as it travels along the guide. This process is the basis for supercontinuum sources that span octaves in frequency, which are important for metrology[1] and carrier-envelope phase measurement[2]. Our experiments uniquely measure the spectral evolution of this continuum as the light propagates along the waveguide by sampling the evanescent field with an uncoated NSOM tip, allowing measurement of the spectrum as it develops over long (mm) length scales, and also allowing the study of the submicron evolution of the spectra both along and across the guide. The evolution in one example is shown in figure 1(a). We will compare the measured continuum generation with our nonlinear propagation modeling, and discuss how the observed spectra differ from predictions of simple models.
Mills, J.D.
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Chaipiboonwong, T.
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Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Baumberg, J.J.
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Charlton, M.D.B.
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Zoorob, M.E.
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Netti, M.C.
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Mills, J.D.
3b139ebc-5875-4367-80e6-f7e94cf2d6a8
Chaipiboonwong, T.
d2793012-1f29-4ffc-a196-9948d46ce47d
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Charlton, M.D.B.
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Zoorob, M.E.
01b3a61a-95c3-45d5-a06b-caa91c734cfd
Netti, M.C.
e565f0dc-9641-4f19-a536-f1c1f01ea0dd

Mills, J.D., Chaipiboonwong, T., Brocklesby, W.S., Baumberg, J.J., Charlton, M.D.B., Zoorob, M.E. and Netti, M.C. (2006) Spectral evolution of femtosecond pulses in nonlinear waveguides: measuring continuum generation and group velocity with NSOM. 9th International Conference on Near-field Optics, Nanophotonics & Related Techniques (NFO-9), Lausanne, Switzerland. 09 - 14 Sep 2006.

Record type: Conference or Workshop Item (Paper)

Abstract

We describe spectral measurements using NSOM of the nonlinear propagation of femtosecond pulses in waveguides. Nonlinearity produces self phase modulation, which broadens the spectrum of the propagating light as it travels along the guide. This process is the basis for supercontinuum sources that span octaves in frequency, which are important for metrology[1] and carrier-envelope phase measurement[2]. Our experiments uniquely measure the spectral evolution of this continuum as the light propagates along the waveguide by sampling the evanescent field with an uncoated NSOM tip, allowing measurement of the spectrum as it develops over long (mm) length scales, and also allowing the study of the submicron evolution of the spectra both along and across the guide. The evolution in one example is shown in figure 1(a). We will compare the measured continuum generation with our nonlinear propagation modeling, and discuss how the observed spectra differ from predictions of simple models.

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Published date: 2006
Venue - Dates: 9th International Conference on Near-field Optics, Nanophotonics & Related Techniques (NFO-9), Lausanne, Switzerland, 2006-09-09 - 2006-09-14

Identifiers

Local EPrints ID: 47855
URI: http://eprints.soton.ac.uk/id/eprint/47855
PURE UUID: 6aee9db9-35d6-476f-9fdc-e72423fbf87c
ORCID for W.S. Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712

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Date deposited: 14 Aug 2007
Last modified: 25 Apr 2020 00:25

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Contributors

Author: J.D. Mills
Author: T. Chaipiboonwong
Author: W.S. Brocklesby ORCID iD
Author: J.J. Baumberg
Author: M.D.B. Charlton
Author: M.E. Zoorob
Author: M.C. Netti

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