Abstract

We report a laser spectroscopy technique for detecting optical absorption in gases and micro-objects via linked thermal effects and by using a sharp mechanical resonance in a quartz crystal. The performance of this technique is studied using near-IR diode lasers and two gases, pure CO2 and C2H2 diluted in nitrogen. A 7.3×108cm1W/(Hz)1/2 noise equivalent sensitivity to absorption in gases is demonstrated. Based on experimental results, it was estimated that 108 fractional absorption of optical radiation by a micro-object deposited on a thin transparent fiber can be detected.

© 2010 Optical Society of America

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