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Tunable carbon monoxide overtone laser sideband system for precision spectroscopy from 2.6 to 4.1 µm

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Abstract

We report a source of tunable laser radiation for high-precision molecular spectroscopy in the 2.6–4.1-µm spectral region. Laser light from a CO overtone laser is mixed with microwaves, generating tunable sidebands of 1 mW of power. We achieve very high absolute frequency accuracy by frequency-offset locking the CO laser to a CO2 laser secondary frequency standard. The uncertainty of the laser frequency is less than 30 kHz Δν/ν=3×10-10, and the laser linewidth is of the order of 100 kHz. This tunable and ultrastable laser system is suitable for very accurate molecular spectroscopy and metrology in a most interesting wavelength region. We demonstrate an application of the system to saturated-absorption spectroscopy of a rovibrational transition of carbonyl sulfide.

© 1998 Optical Society of America

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