We investigate Doppler-free absorption lines induced by counter-propagating polychromatic optical fields in the D1 line of 87Rb atoms. Cases of orthogonal and parallel polarizations are considered. The resonance associated with Fe = 1 demonstrates unusual behaviour with two-photon detuning: the amplitude grows while the width becomes smaller. The crossover resonance involving transitions to both sublevels Fe = 1, 2 of the excited state is more pronounced at parallel polarizations than at orthogonal and has smaller width compared to the lines corresponding to atomic transitions. A qualitative explanation of experimentally observed features is given.We investigate Doppler-free absorption lines induced by counter-propagating polychromatic optical fields in the D1 line of 87Rb atoms. Cases of orthogonal and parallel polarizations are considered. The resonance associated with Fe = 1 demonstrates unusual behaviour with two-photon detuning: the amplitude grows while the width becomes smaller. The crossover resonance involving transitions to both sublevels Fe = 1, 2 of the excited state is more pronounced at parallel polarizations than at orthogonal and has smaller width compared to the lines corresponding to atomic transitions. A qualitative explanation of experimentally observed features is given.

Journal of Experimental and Theoretical Physics LettersApr 1, 20253 citations

Optical spectroscopy of rubidium Rydberg atoms with a 297 nm frequency-doubled dye laser

Pierre Thoumany, Theodor W. Hänsch, Gernot Stania +2 more

We demonstrate Doppler-free, purely optical detection of laser-excited rubidium Rydberg atoms in a room-temperature gas cell. The Rydberg atoms are excited with a frequency-doubled dye laser at 297 nm in a single-excitation step from the ground state; the detection is performed with a 780 nm diode laser in a scheme similar to electron shelving. Laser spectroscopy of Rydberg transitions is demonstrated, and a frequency-doubled dye is stabilized to one Rydberg transition in the UV. The performance of this stabilization is measured with an atomic-beam apparatus and a time of flight experiment.We demonstrate Doppler-free, purely optical detection of laser-excited rubidium Rydberg atoms in a room-temperature gas cell. The Rydberg atoms are excited with a frequency-doubled dye laser at 297 nm in a single-excitation step from the ground state; the detection is performed with a 780 nm diode laser in a scheme similar to electron shelving. Laser spectroscopy of Rydberg transitions is demonstrated, and a frequency-doubled dye is stabilized to one Rydberg transition in the UV. The performance of this stabilization is measured with an atomic-beam apparatus and a time of flight experiment.

Optics LettersMay 19, 200944 citations

Doppler-free nonlinear processes in strong optical fields

A. K. Popov, Vladimir M. Shalaev

Optics and SpectroscopySep 1, 19800 citations

Velocity-selective double resonance in Doppler-broadened rubidium vapor

Nataša Vujičić, Ticijana Ban, Gordana Kregar +2 more

We study resonantly enhanced cascaded two-photon transitions in Doppler-broadened rubidium vapor, induced by an optical frequency comb. Cascaded two-step excitation of atoms from the ground state 5 $S$ ${}_{1/2}$ to the final 5 $D$ ${}_{5/2}$ state via an intermediate 5 $P$ ${}_{3/2}$ state as well as the influence of the frequency comb repetition rate on the two-photon fluorescence signal have been investigated. It is shown that the careful choice of ${f}_{R}$ leads to enhancement of the two-photon signal with considerable increase of the final $5{D}_{5/2}$ -state population due to velocity-selective double resonance. Since the double-resonance condition for two different rubidium isotopes is fulfilled for different ${f}_{R}$ , the possibility of isotope-selective two-photon excitation is explored. The dependence of the two-photon signal on external magnetic field values and different repetition rates of the optical frequency comb is also investigated.We study resonantly enhanced cascaded two-photon transitions in Doppler-broadened rubidium vapor, induced by an optical frequency comb. Cascaded two-step excitation of atoms from the ground state 5$S$${}_{1/2}$ to the final 5$D$${}_{5/2}$ state via an intermediate 5$P$${}_{3/2}$ state as well as the influence of the frequency comb repetition rate on the two-photon fluorescence signal have been investigated. It is shown that the careful choice of ${f}_{R}$ leads to enhancement of the two-photon signal with considerable increase of the final $5{D}_{5/2}$-state population due to velocity-selective double resonance. Since the double-resonance condition for two different rubidium isotopes is fulfilled for different ${f}_{R}$, the possibility of isotope-selective two-photon excitation is explored. The dependence of the two-photon signal on external magnetic field values and different repetition rates of the optical frequency comb is also investigated.

Physical Review AJan 31, 201314 citations

Nonlinear Resonances on Coupled Doppler-Broadened Transitions

Vladilen S Letokhov, Veniamin P. Chebotayev

Springer series in optical sciences/SPringer series in optical sciencesJan 1, 19771 citation

We study resonantly enhanced cascaded two-photon transitions in Doppler-broadened rubidium vapor, induced by an optical frequency comb. Cascaded two-step excitation of atoms from the ground state 5

S

{}_{1/2}

to the final 5

D

{}_{5/2}

state via an intermediate 5

P

{}_{3/2}

state as well as the influence of the frequency comb repetition rate on the two-photon fluorescence signal have been investigated. It is shown that the careful choice of

{f}_{R}

leads to enhancement of the two-photon signal with considerable increase of the final

5{D}_{5/2}

-state population due to velocity-selective double resonance. Since the double-resonance condition for two different rubidium isotopes is fulfilled for different

{f}_{R}

, the possibility of isotope-selective two-photon excitation is explored. The dependence of the two-photon signal on external magnetic field values and different repetition rates of the optical frequency comb is also investigated.