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 and diluted in nitrogen. A noise equivalent sensitivity to absorption in gases is demonstrated. Based on experimental results, it was estimated that fractional absorption of optical radiation by a micro-object deposited on a thin transparent fiber can be detected.
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