Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1996-05-29
1999-01-05
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
G01J 344, G01N 2165
Patent
active
058568697
ABSTRACT:
A distributed Bragg reflector (DBR) diode laser is used as excitation source for fiber optic Raman spectroscopy utilizing charge coupled device (CCD) detection and an image-corrected spectrograph. The DBR diode laser is superior to index guided diode lasers (Fabry-Perot) for elimination of mode hopping, elimination of frequency hysteresis as a function of both temperature and current changes, and reduction in laser broadband emission. These advantages allow the DBR laser to be used in industrial process control applications which are too demanding for index guided diode lasers.
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Cooper John B
Flecher Philip E.
Welch William T.
Adamcik A. J.
Ashland Inc
Evans F. L.
Stone Richard D.
Willson, Jr. Richard C.
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