# APPLICATION OF CAVITY-ENHANCED SPECTROSCOPY: ULTRA-STABLE FREQUENCY LASERS AND ULTRA-HIGH RESOLUTION SPECTROSCOPY

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 Title: APPLICATION OF CAVITY-ENHANCED SPECTROSCOPY: ULTRA-STABLE FREQUENCY LASERS AND ULTRA-HIGH RESOLUTION SPECTROSCOPY Creators: Ishibashi, C.; Silva, Michelle L.; Ye, Jun; Hall, J. L. Issue Date: 2002 Publisher: Ohio State University Abstract: Cavity-enhanced spectroscopy is a useful technique to achieve high sensitivity, which realizes observation of week absorption such as molecular vibrational overtone $bands^{a}$. Comparing to cavity-ringdown spectroscopy, cavity-enhanced spectroscopy using CW laser is more suitable for laser frequency stabilization or high resolution spectroscopy. High signal to noise ration obtained by cavity-enhanced spectroscopy helps to realize ultra-high stability of laser frequency with a tabletop-compact spectrometer. The expected stability of laser frequency was analyzed and spectrometer was built for Nd:YAG laser stabilized to a hyperfine resolved X-B band transition of iodine at 532 nm. The combination technique of frequency modulation spectroscopy and cavity enhanced spectroscopy called NICE-OHMS (noise immune cavity- enhanced optical heterodyne molecular $spectroscopy)^{bcd}$ makes it easy to achieve shot-noise limited detection with an extremely high finesse cavity. NICE-OHMS is being prepared to hyperfine resolved high resolution spectroscopy of $v = 0-5$ band of HBr at 790 nm region. Description: $^{a}$M. de Labachelerie, K. Nakagawa, and M. Ohtsu, Opt. Lett. 19, 840 (1994) $^{b}$J. Ye, L.-S. Ma, and J. L. Hall, Opt. Lett. 21, 1000 (1996). $^{c}$J. Ye, L.-S. Ma, and J. L. Hall, J. Opt. Soc. Am. B 15, 6 (1998). $^{d}$L.-S. Ma, J. Ye, P. Dube, and J. L. Hall, J. Opt. Soc. Am. B 16, 2255 (1999). Author Institution: JILA, University of Colorado and National Institute of Standards and Technology URI: http://hdl.handle.net/1811/20625 Other Identifiers: 2002-TH-05