Picosecond broadband cars probe using the picosecond continuum

Details Picosecond broadband cars probe using the picosecond continuum Picosecond broadband cars probe using the picosecond continuum

1983-04-14

1985-04-23

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

G01J 344, G01N 2165

Patent

active

045126607

ABSTRACT:
A coherent anti-Stokes Raman spectroscopy (CARS) method and apparatus for producing a broadband CARS vibrational spectrum of a sample in a single picosecond laser pulse. A laser pulse having a picosecond duration and a frequency of .omega. is directed into a liquid cell containing D.sub.2 O which generates a picosecond continuum pulse having a broad range of frequencies .omega..sub.WL and a picosecond duration. A second harmonic of the laser pulse is produced to form a probe pulse having a frequency of .omega..sub.1 and a picosecond duration. The probe pulse and the continuum pulse are spatially and temporally combined and the combined pulses are directed into a sample to excite the Raman active vibrational resonances in the sample. In response the sample emits a beam of radiation which contains an anti-Stokes spectrum of energy characteristic of the sample. The anti-Stokes spectrum is separated from the beam of radiation for detection and analysis.

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