| US 7,586,618 B2 | ||
| Distinguishing non-resonant four-wave-mixing noise in coherent stokes and anti-stokes Raman scattering | ||
| Daniel L. Marks, Urbana, Ill. (US); and Stephen A. Boppart, Champaign, Ill. (US) | ||
| Assigned to The Board of Trustees of the University of Illinois, Urbana, Ill. (US) | ||
| Filed on Feb. 28, 2005, as Appl. No. 11/68,739. | ||
| Prior Publication US 2006/0192969 A1, Aug. 31, 2006 | ||
| Int. Cl. G01J 3/45 (2006.01) | ||
| U.S. Cl. 356—451 [356/456] | 12 Claims |
| 1. A method of examining a sample, comprising:
exposing of the sample to a pump pulse of electromagnetic radiation for a first period of time, defined as the pump pulse
duration,
exposing of the sample to a stimulant pulse of electromagnetic radiation for a second period of time that is shorter than,
or equal in duration to, the pump pulse duration, thereby producing a signal pulse of electromagnetic radiation for a third
period of time which extends beyond the stimulant pulse duration,
interfering the signal pulse with a reference pulse of electromagnetic radiation, and
demodulating a portion of the signal pulse that is not conterminous with the stimulant pulse duration.
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