[MOS] Tuesday, February 24, 2004

[Vinnie Russo]

Dear Colleagues,

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:

Manipulating Light-Matter Interactions Via 2D Femtosecond Pulse Shaping
Joshua Vaughan, Massachusetts Institute of Technology
Thomas Hornung, Massachusetts Institute of Technology

Tuesday, February 24, 2004
12 noon  1 PM
MIT Grier Room 34-401 / 50 Vassar Street, Cambridge, MA
(http://whereis.mit.edu/map-jpg?mapterms=34-401)

Refreshments will be served following the talk.

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
* * * * * * * * * * * * * *

Manipulating Light-Matter Interactions Via 2D Femtosecond Pulse Shaping
Joshua Vaughan, Massachusetts Institute of Technology
Thomas Hornung, Massachusetts Institute of Technology
      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.


Vinnie Russo * vrusso at mit.edu  *  Office Manager
MIT; G.R. Harrison  Spectroscopy Laboratory
77 Mass. Ave., 6-014  *  Cambridge, MA  02139
(v) 617-253-9774  *  (f) 617-253-4513
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