G - Physics – 01 – J
Patent
G - Physics
01
J
73/111, 73/55
G01J 3/12 (2006.01) G01J 3/44 (2006.01) H01S 3/30 (2006.01)
Patent
CA 1136893
TIME-RESOLVED INFRARED SPECTRAL PHOTOGRAPHY ABSTRACT An intense broadband continuum light pulse of uniform spectral intensity and short time duration is generated, then downconverted in frequency to a region of interest, preferably in the infrared region, by applying it as a pump pulse to a molecular or atomic vapor so as to induce stimu- lated Raman scattering. The resulting uniform spectral intensity distribution Raman Stokes pulse is then used to probe a sample. The sample converts the distribution of the probe pulse into a nonuniform spectral intensity distribu- tion which contains the absorption spectrum of the sample. This spectrum pulse has the same spectral bandwidth and time duration as the Raman Stokes pulse and is finally upconvert- ed in frequency to a region where the spectrum pulse can be conveniently recorded. This is done with a four-wave Raman mixing process in an alkali metal vapor. The vapor is simultaneously pumped with the spectrum pulse and with a second pumping light pulse (or beam) having a frequency in the vicinity of a suitable resonance line of the vapor so as to induce SERS. In the alkali metal vapor, the re- sulting Raman Stokes pulse and spectrum pulse beat to- gether with the second pumping light pulse to produce an upconverted pulse at a higher frequency band, which sur- prisingly also tends to have the same spectral bandwidth, intensity distribution (spectrum) and time duration as the spectrum pulse. The upconverted pulse is then recorded either photographically or photoelectrically with conven- tional spectrographic apparatus. YO9-79-063
355797
Bethune Donald S.
Lankard John R.
Loy Michael M.t.
Sorokin Peter P.
International Business Machines Corporation
Rosen Arnold
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