Perhaps interesting seminar guys!
Alán Aspuru-Guzik | Associate Professor
Harvard University | Department of Chemistry and Chemical Biology
12 Oxford Street, Room M113 | Cambridge, MA 02138
(617)-384-8188 |
http://aspuru.chem.harvard.edu |
http://about.me/aspuru
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Date: Thu, 14 Apr 2011 10:32:47 -0400
Subject: AMP Seminar Monday April 18, Title correction, Evgeny Shapiro
(University of British Columbia)
Please join us for an informal seminar sponsored by the Atomic and
Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics.
(Complete schedule at
http://www.cfa.harvard.edu/amp/events.html)
2:00 PM Monday April 18, 2011
PRATT Conference Room
60 Garden St., Cambridge, MA 02138
Coherent nonlinear spectroscopy with noisy broadband laser pulses
Dr. Evgeny Shapiro
Dept. of Chemistry, University of British Columbia
As a laser pulse is applied to an opaque scattering sample - such as
biological tissue, paint, suspension, or plastic - its structure
breaks down. In space, a coherent beam breaks into a multitude of
speckles. In the spectral domain, the pulse is strongly modified due to
the random transmission of the sample. Both effects are
deleterious for one's ability to use coherent techniques for the
spectral analysis of the sample.
I will review our ongoing work aimed at implementing nonlinear
spectroscopy with coherent broadband laser pulses that have passed
through opaque samples. Our goal is to use the quasi-random spectrum
of light for extracting spectral information [1,2]. At the same time,
we use two-dimensional spatial light modulators to correct for the
spatial and temporal distortions due to the multiple scattering in
opaque samples.
[1] E.A. Shapiro, S.O. Konorov, V. Milner, "Interference
spectroscopy with coherent anti-Stokes Raman scattering of noisy
broadband pulses" , arXiv: 1104.1164.
[2] X.G. Xu, S.O. Konorov, J.W. Hepburn, V. Milner, "Noise autocorrelation
spectroscopy with coherent Raman scattering",
Nature Physics 4, 125 (2008).