Recoil-induced resonances in cesium: An atomic analog to the free-electron laser (original) (raw)
Related papers
Quantized motion of cold cesium atoms in two- and three-dimensional optical potentials
Physical Review Letters, 1993
Quantization of atomic motion is observed in twoand three-dimensional cesium optical molasses by stimulated Raman spectroscopy. A new geometry is used with the minimum number of laser beams, so that the topography of the optical potential is not sensitive to phase drifts of the molasses beams. The deepest potential wells are located on hexagonal lattice in two dimensions and on a body-centered-cubic lattice in three dimensions. They correspond to purely circularly polarized light, allowing a Lamb-Dicke narrowing of the transitions between vibrational levels to occur.
The resonant 4d photoemission spectrum of atomic cesium
Journal of Electron Spectroscopy and Related Phenomena, 2005
In this work we have studied the 4d photoexcitation of atomic cesium vapor at high resolution in the energy range 75-90 eV. Below threshold, the two series of the 4d 10 6s → 4d 9 6s6p 3,1 P discrete transitions are observed to dominate the measured ion-yield spectra. The high photon energy resolution allowed us to selectively excite specific resonances. In this way the decay of the different excited states lying close to each other could be followed with a minimum of interference from overlapping transitions. Here we present the resonant Auger spectra recorded at the lowest energy 4d excited states and a preliminary analysis based on previous experimental and theoretical results.
Precise Measurement of Hyperfine Structure of Cesium 7S1/2 Excited State
Applied Sciences, 2020
We present a precise measurement of the hyperfine structure of cesium 7 S 1 / 2 excited state by employing electromagnetically induced spectroscopy (EIS) with a cesium three-level cascade ( 6 S 1 / 2 − 6 P 3 / 2 − 7 S 1 / 2 ) atom in a room temperature vapor cell. A probe laser, λ p = 852 nm, was coupled to a transition | 6 S 1 / 2 ⟩ → | 6 P 3 / 2 ⟩ , related frequency locked to the resonance hyperfine transition of | 6 S 1 / 2 ⟩ → | 6 P 3 / 2 ⟩ with a Fabry–Perot (FP) cavity and an electro-optic modulator (EOM). A coupling laser, λ c = 1470 nm, drove the | 6 P 3 / 2 ⟩ → | 7 S 1 / 2 ⟩ transition with the frequency scanned over the | 6 P 3 / 2 ⟩ → | 7 S 1 / 2 ⟩ transition line. The hyperfine level interval was extracted to be 2183.61 ± 0.50 MHz by analyzing EIS spectroscopy. The optical–optical double-resonance (OODR) spectroscopy is also presented for comparison, with the corresponding value of the hyperfine level interval being 2183.48 MHz ± 0.04 MHz, and the measured hyperfine spl...
Observation of a Hole in the Laser-Induced Cesium Beam Spectrum
IEEE Access, 2021
We experimentally observed a depression in the laser-induced cesium beam fluorescence spectrum. This paper describes the optical configuration we realized and proves that the hole can be used for laser frequency stabilization. The spectrum was recorded under different conditions. We theoretically analyzed the physical origin of this effect and found that the hole could have a sub-natural line width. This indicates that it could have great application prospects in atomic experiments and beam-type quantum precision instruments due to the simple construction. INDEX TERMS Laser-induced spectrum, cesium beam, laser frequency stability.
Observation of Low-Field Feshbach Resonances in Collisions of Cesium Atoms
Physical Review Letters, 1999
We observe several Feshbach resonances in magnetic fields below 40 G for Cs atoms trapped in a 1D optical lattice. One resonance occurs in the lowest-energy ground state F 3, m F 3 which is stable against inelastic binary collisions. This opens new possibilities for Bose condensation of Cs. When the elastic collision rate far exceeds the radial vibration frequency, we enter a 2D hydrodynamic regime where the thermalization rate is independent of density and temperature. Other resonances are also observed in the F 3, m F 23 state through a dramatic increase in the dipolar relaxation rate.
Femtosecond laser pulse train effect on Doppler profile of cesium resonance lines
The European Physical Journal D, 2007
We present direct observation of the velocity-selective optical pumping of the Cs ground state hyperfine levels induced by the femtosecond (fs) laser oscillator centered at either D2 (6 2 S 1/2 → 6 2 P 3/2 , 852 nm) or D1 (6 2 S 1/2 → 6 2 P 1/2 , 894 nm) cesium line. We utilized previously developed modified direct frequency comb spectroscopy (DFCS) which uses a fixed frequency comb for the excitation and a weak cw scanning probe laser centered at the 133 Cs 6 2 S 1/2 → 6 2 P 3/2 transition (D2 line) for ground levels population monitoring. The frequency comb excitation changes the usual Doppler absorption profile into a specific periodic, comblike structure. The mechanism of the velocity selective population transfer between the Cs ground state hyperfine levels induced by fs pulse train excitation is verified in a theoretical treatment of the multilevel atomic system subjected to a pulse train resonant field interaction.
Ground-state magneto-optical resonances in cesium vapor confined in an extremely thin cell
Physical Review A, 2007
Experimental and theoretical studies are presented related to the ground-state magneto-optical resonance prepared in Cesium vapour confined in an Extremely Thin Cell (ETC, with thickness equal to the wavelength of the irradiating light). It is shown that the utilization of the ETC allows one to examine the formation of a magneto-optical resonance on the individual hyperfine transitions, thus distinguishing processes resulting in dark (reduced absorption) or bright (enhanced absorption) resonance formation. We report on an experimental evidence of the bright magneto-optical resonance sign reversal in Cs atoms confined in the ETC. A theoretical model is proposed based on the optical Bloch equations that involves the elastic interaction processes of atoms in the ETC with its walls resulting in depolarization of the Cs excited state which is polarized by the exciting radiation. This depolarization leads to the sign reversal of the bright resonance. Using the proposed model, the magneto-optical resonance amplitude and width as a function of laser power are calculated and compared with the experimental ones. The numerical results are in good agreement with the experiment.
Absorption spectra for strong pump and probe in atomic beam of cesium atoms (2009)
2009
We calculate the pump and probe absorption spectra for the cycling F g =4→ F e = 5 transition D 2 line of 133 Cs in an atomic beam, interacting with a strong resonant + -polarized pump and a probe of comparable intensity and either − or polarization. The aim is to reproduce and analyze the experiments of Dahl et al. ͓Opt. Lett. 33, 983 ͑2008͔͒ who showed for a + -polarized pump and − -polarized probe that the pump absorption spectrum switches from an "absorption within transparency" ͑AWT͒ structure, when the probe is weaker than the pump, to a "transparency within transparency" ͑TWT͒ structure, when the probe is stronger than the pump. For all other polarization combinations, the pump spectrum displays AWT behavior at all probe intensities. We analyze our results by considering the contributions that derive from the individual m g → m e transitions. When the + -polarized pump is stronger than the − -polarized probe, the population is swept toward the m g → m e = m g + 1 transitions with the highest values of m g , and the pump absorption spectrum has an AWT structure and resembles that of an N system. However, when the probe is stronger than the pump, the population is swept toward the m g =−F g → m e = m g − 1 transition when the probe is near resonance, and to the m g = F g → m e = m g + 1 transition when the probe is detuned from resonance. The pump and probe spectra are mirror images of each other and resemble those of a V system where the probe has a peak at line center and the pump spectrum has a TWT structure. For a strong + pump and an even stronger probe, the population concentrates in the intermediate transitions, and the AWT to TWT changeover does not occur. We also show that the narrow features in the spectra at line center derive from transfer of coherence from the excited to the ground hyperfine levels.
Strong-field two-photon absorption in atomic cesium: an analytical control approach
Optics Express, 2009
We have considered an analytical control of two-photon absorption process of atoms in the strong-field interaction regime. The experiment was performed on gaseous cesium atoms strongly interacting with a shaped laser-pulse from a femtosecond laser amplifier and a programmable pulse-shaper. When this shaped laser-pulse transfers the atomic population from the 6s ground state to the 8s excited state, we have found that both positively-and negatively-chirped laser pulses, compared with a Gaussian pulse, enhance this excitation in the strong-field regime of laser-atom interaction. This unusual phenomena is explained because the temporal shape of the laser intensity compensates the effect of dynamic Stark shift for the two-photon resonant condition to be optimally maintained. We provide analytic calculations using the strong-field phase matching, which show good agreement with the experiment.