Ye, Jun and Ma, Long-Sheng and Hall, John L. (1998) Ultrasensitive detections in atomic and molecular physics: demonstration in molecular overtone spectroscopy. Journal of the Optical Society of America B, 15 (1). pp. 6-15. ISSN 0740-3224. http://resolver.caltech.edu/CaltechAUTHORS:YEJjosab98
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We consider several highly sensitive techniques commonly used in detection of atomic and molecular absorptions. Their basic operating principles and corresponding performances are summarized and compared. We then present our latest results on the ultrasensitive detection of molecular overtone transitions to illustrate the principle and application of the cavity-enhanced frequency-modulation (FM) spectroscopy. An external cavity is used to enhance the molecular response to the light field, and an FM technique is applied for shot-noise-limited signal recovery. A perfect match between the FM sideband frequency and the cavity free spectral range makes the detection process insensitive to the laser-frequency noise relative to the cavity, and, at the same time, overcomes the cavity bandwidth limit. Working with a 1.064-µm Nd:YAG laser, we obtained sub-Doppler overtone resonances of C2HD, C2H2, and CO2 molecules. A detection sensitivity of 5 x 10^-13 of integrated absorption (1 x 10^-14/cm) over 1-s averaging time has been achieved.
|Additional Information:||© Copyright 1998 Optical Society of America Received May 28, 1997; revised manuscript received August 13, 1997 We wish to acknowledge the funding support from the National Institute of Standards and Technology, the U.S. Office of Naval Research, the U.S. Air Force Office of Scientific Research, and the National Science Foundation.|
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|Deposited On:||19 Oct 2006|
|Last Modified:||26 Dec 2012 09:12|
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