Collinear two-color saturation spectroscopy in CN A-X (1-0) and (2-0) bands

Hyperfine-resolved saturation spectra were measured for a selection of low and medium J rotational lines in the A (2)Pi-X-2 Sigma(+) system of CN using two copropagating laser beams tuned to transitions in the (2-0) and (1-0) bands. A bleach laser was amplitude modulated and fixed in frequency near the center of a rotational line of the (2-0) vibrational band, while a probe laser was frequency-modulated and scanned across selected lines of the (1-0) vibrational band, sharing a common lower state with the bleach laser. Locking the probe laser with a tunable radio frequency offset to a cavity that tracks the slowly drifting bleach laser greatly improved the quality of the double-resonance saturation signals, by stabilizing the relative frequency of the two beams. The sub-Doppler resonances were fit with Lorentzian line shapes having a typical full-width at half maximum of 2-3 MHz. The hyperfine spectra observed depend on the hyperfine structure within both rovibronic transitions excited, permitting the determination of hyperfine molecular constants in the v = 2 state and the refinement of previously published values in the v = 1 state. Four nuclear magnetic dipole and two electric quadrupole hyperfine constants were determined for each of the upper states from a fit with a weighted root mean squared error of 0.5 MHz. The vibrational dependence of these constants is weak or negligible. (C) 2013 Elsevier Inc. All rights reserved.