We investigate the coherent population trapping (CPT) resonances excited in rubidium atoms by the femtosecond optical comb in magnetic field. The light shift of resonances was observed and studied.

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In a frequency-modulation spectroscopy experiment, using the radiation from a single frequency diode laser, the spectra of molecular iodine hyperfine structure near 640 nm were recorded on the transition B 3 Π 0 + u − X 1 Σ + g . The frequency reference given by the value of the modulation frequency (12.5 MHz in given experiment) allows determination of the frequency differences between hyperfine components with accuracy better than 0.1 MHz using the fitting procedure in experiment with only one laser.

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