Cavity-enhanced frequency modulation spectroscopy: advancing optical detection sensitivity and laser frequency stabilization

Jun Ye; Long-Sheng Ma; John L. Hall

doi:10.1117/12.308366

15 May 1998 Cavity-enhanced frequency modulation spectroscopy: advancing optical detection sensitivity and laser frequency stabilization

Jun Ye, Long-Sheng Ma, John L. Hall

Author Affiliations +

Proceedings Volume 3270, Methods for Ultrasensitive Detection; (1998) https://doi.org/10.1117/12.308366
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

High detection sensitivities of quantum absorptions are important in many research fields of physics, chemistry and biology. In this paper we present our latest results on the ultrasensitive molecular overtone spectroscopy using the cavity-enhanced frequency modulation (FM) technique. The principle of this method makes use of a high-finesse external cavity to enhance the intrinsic resonance contrast, while an FM modulation approach provides short-noise limited signal recovery. Ideal matching of the FM sideband frequency to the cavity free-spectral-range makes the detection process insensitive to laser frequency noise relative noise relative to the cavity, while at the same time overcomes the cavity bandwidth limit.Working with a 1064-nm Nd:YAG laser, we have obtained sub-Doppler overtone resonances of HCCD, HCCH and CO₂ molecules. A detection sensitivity of 5 X 10^-13 of integrated absorption over 1-s averaging time has been achieved. The resultant high signal- to-noise ratio of the weak resonance produces excellent laser frequency stabilization.

Citation Download Citation

Jun Ye, Long-Sheng Ma, and John L. Hall "Cavity-enhanced frequency modulation spectroscopy: advancing optical detection sensitivity and laser frequency stabilization", Proc. SPIE 3270, Methods for Ultrasensitive Detection, (15 May 1998); https://doi.org/10.1117/12.308366

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