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Method and apparatus for two-dimensional spectroscopy

United States Patent

October 12, 2010
View the Complete Patent at the US Patent & Trademark Office
Preferred embodiments of the invention provide for methods and systems of 2D spectroscopy using ultrafast, first light and second light beams and a CCD array detector. A cylindrically-focused second light beam interrogates a target that is optically interactive with a frequency-dispersed excitation (first light) pulse, whereupon the second light beam is frequency-dispersed at right angle orientation to its line of focus, so that the horizontal dimension encodes the spatial location of the second light pulse and the first light frequency, while the vertical dimension encodes the second light frequency. Differential spectra of the first and second light pulses result in a 2D frequency-frequency surface equivalent to double-resonance spectroscopy. Because the first light frequency is spatially encoded in the sample, an entire surface can be acquired in a single interaction of the first and second light pulses.
DeCamp; Matthew F. (Swarthmore, PA), Tokmakoff; Andrei (Lexington, MA)
Massachusetts Institute of Technology (Cambridge, MA)
11/ 607,813
December 1, 2006
U.S. GOVERNMENT SUPPORT Support from the Basic Energy Sciences of the U.S. Department of Energy (Grant# DEFG02-99ERI4988) and the National Science Foundation.