We demonstrate the possibility of extending the well-established metrological performance of optical frequency-comb synthesizers to the mid-IR region by phase locking the pump and signal lasers of a difference-frequency source to two near-IR teeth of an optical comb. An uncertainty of 800 Hz 共1.1⫻ 10 −11 兲 in the absolute frequencies of CO 2 transitions near 4.2 m has been measured by cavity-enhanced saturated- absorption spectroscopy. Prospects for the creation of a new dense set of high-quality molecular frequency standards in the IR are discussed.
Frequency-comb-based absolute frequency measurements in the mid-IR with difference-frequency-based spectrometer
PREVEDELLI, MARCO
2005
Abstract
We demonstrate the possibility of extending the well-established metrological performance of optical frequency-comb synthesizers to the mid-IR region by phase locking the pump and signal lasers of a difference-frequency source to two near-IR teeth of an optical comb. An uncertainty of 800 Hz 共1.1⫻ 10 −11 兲 in the absolute frequencies of CO 2 transitions near 4.2 m has been measured by cavity-enhanced saturated- absorption spectroscopy. Prospects for the creation of a new dense set of high-quality molecular frequency standards in the IR are discussed.File in questo prodotto:
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