Frequency modulation spectroscopy using dual frequency modulatio

Details Frequency modulation spectroscopy using dual frequency modulatio Frequency modulation spectroscopy using dual frequency modulatio

1986-07-24

1988-08-23

Rosenberger, R. A.

Optics: measuring and testing

By dispersed light spectroscopy

356256, G01N 2131

Patent

active

047657367

ABSTRACT:
FM laser spectroscopy apparatus includes a single modulator for modulating a laser beam with first and second modulation signals (.omega..sub.1, .omega..sub.2). The two modulation signals are generated by mixing a signal from a first oscillator (.omega..sub.1 +.omega..sub.2)/2 and a signal from a second oscillator (.omega..sub.1 -.omega..sub.2)/2 and producing the two modulation signals (.omega..sub.1, .omega..sub.2). The modulator produces three groups of sidebands on the laser beam at the laser frequency plus and minus the two modulation frequencies and at plus and minus the difference between the two modulation signal frequencies. The apparatus provides practical high frequency FM spectroscopy as required for the observation of pressure broadened spectral features.

REFERENCES:
patent: 4297035 (1981-10-01), Bjorklund
"Double Frequency Modulation Spectroscopy", Applied Optics, David E. Cooper & T. F. Gallagher, May 1, 1985, vol. 24, No. 9, pp. 1327-1333.

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