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Ultrasensitive High Resolution Laser Spectroscopy and Its Application to Optical Frequency Standards
COLORADO UNIV AT BOULDER
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Advanced laser stabilization techniques now permit one to lock laser frequencies onto line centers of natural atomicmolecular resonances with unprecedented precision and accuracy, leading to improved visible optical frequency standards. A novel approach of cavity-enhanced frequency modulation spectroscopy is demonstrated to enjoy a record high sensitivity 6 x 10-12 integrated absorption, working with a rich spectrum of weak molecular overtone transitions. The resultant high signal-to-noise ratio allows a NdYAG laser to be stabilized on the overtone transition at the level of 1 x 10-14 in 800 seconds. For the work of coherent optical frequency connection, we present our recent development of an optical frequency comb generator with a 3-terahertz span.
APPROVED FOR PUBLIC RELEASE