Share Email Print
cover

Proceedings Paper

Cavity-enhanced frequency modulation spectroscopy: advancing optical detection sensitivity and laser frequency stabilization
Author(s): Jun Ye; Long-Sheng Ma; John L. Hall
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper 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.

Paper Details

Date Published: 15 May 1998
PDF: 12 pages
Proc. SPIE 3270, Methods for Ultrasensitive Detection, (15 May 1998); doi: 10.1117/12.308366
Show Author Affiliations
Jun Ye, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)
Long-Sheng Ma, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)
John L. Hall, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 3270:
Methods for Ultrasensitive Detection
Bryan L. Fearey, Editor(s)

© SPIE. Terms of Use
Back to Top