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Ultrasensitive detection of weak resonances--application to optical frequency standards

Published

Author(s)

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

Abstract

We present our latest results on the ultrasensitive molecular overtone spectroscopy using the cavity-enhanced frequency modulation (FM) technique. The principle of this technique makes use of a high-finesse external cavity to enhance the intrinsic resonance contrast, while an FM modulation approach provided shot-noise limited signal recovery. Working with a 1.064 υm Nd:YAG laser, we have obtained sub-Doppler overtone resonances of C2HD, C6d2^H2 and CO2 molecules. A detection sensitivity of 5x10-13 of integrated absoption (1x10-14/cm) 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
International Conference on Laser Spectroscopy

Keywords

FM spectroscopy, high-finesse cavity, molecular overtone spectroscopy, ultrasensitive detections

Citation

Ye, J. , Ma, L. and Hall, J. (2008), Ultrasensitive detection of weak resonances--application to optical frequency standards, International Conference on Laser Spectroscopy (Accessed April 22, 2024)
Created October 16, 2008