Abstract

A new approach to detecting a weak photoacoustic signal in a gas medium is described. Instead of a gas-filled resonant acoustic cavity, the sound energy is accumulated in a high-Q crystal element. Feasibility experiments utilizing a quartz-watch tuning fork demonstrate a sensitivity of 1.2×10-7 cm-1 W/Hz. Potential further developments and applications of this technique are discussed.

© 2002 Optical Society of America

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