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Dear Colleagues,<br><br>
The G.R. Harrison Spectroscopy Laboratory and the Department of
Electrical Engineering and Computer Science would like to invite you to
the next seminar in our series on Modern Optics and
Spectroscopy:<br><br>
<i>Manipulating Light-Matter Interactions Via 2D Femtosecond Pulse
Shaping<br>
</i><b>Joshua Vaughan</b>, Massachusetts Institute of Technology<br>
<b>Thomas Hornung,</b> Massachusetts Institute of Technology<br><br>
<b>Tuesday, February 24, 2004<br>
</b>12 noon 1 PM<br>
MIT Grier Room 34-401 / 50 Vassar Street, Cambridge, MA<br>
(<a href="http://whereis.mit.edu/map-jpg?mapterms=34-401" eudora="autourl">http://whereis.mit.edu/map-jpg?mapterms=34-401</a>)<br><br>
Refreshments will be served following the talk.<br><br>
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * *<br><br>
<i>Manipulating Light-Matter Interactions Via 2D Femtosecond Pulse
Shaping<br>
</i><b>Joshua Vaughan</b>, Massachusetts Institute of Technology<br>
<b>Thomas Hornung,</b> Massachusetts Institute of Technology<br>
Control of the spatial and temporal properties
of ultrafast waveforms via two-dimensional (2D) femtosecond pulse shaping
allows for careful manipulation of light-matter interactions. Two
applications are discussed here: spatiotemporal coherent control of
lattice vibrational waves and degenerate four-wave mixing spectroscopy.
In the first application, shaped excitation light fields were directed
toward distinct regions of crystalline samples, producing
terahertz-frequency lattice vibrational waves that emanated outward at
lightlike speeds. Interferences among the waves resulted in fully
specified far-field responses, including tilted, focusing, or amplified
wavefronts. In the second application, 2D femtosecond pulse shaping was
used to control the arrival time, shape, and phase of three or four
noncollinear incident pulses for performing noncollinear degenerate
four-wave mixing spectroscopy without mechanical delay lines. Since the
incident beams travel a common set of optics to the sample, they have
excellent phase stability and permit heterodyne detection of the
third-order polarization.<br><br>
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Vinnie Russo * vrusso@mit.edu * Office Manager<br>
MIT; G.R. Harrison Spectroscopy Laboratory<br>
77 Mass. Ave., 6-014 * Cambridge, MA 02139<br>
(v) 617-253-9774 * (f) 617-253-4513</html>