A spectrophone utilizing a resonant cylindrical cavity and operated by driving the first azimuthal mode of the cavity has been developed for the study of weak absorption lines of gases at pressures from 100 to 1300 Torr. Presented are the acoustic resonant amplification factor as a function of pressure, and a description of the noise sources inherent in this spectrophone. An example is given of the optical frequency resolution resulting when this spectrophone is used in conjunction with a tunable ring dye laser as a high resolution spectrometer.
© 1989 Optical Society of America
Robert P. Fiegel, Paul B. Hays, and Wayne M. Wright, "Photoacoustic technique for the measurement of absorption line profiles," Appl. Opt. 28, 1401-1408 (1989)