We describe a series of measurements of absorption and laser induced fluorescence on cells that contained cesium and rubidium and a rare gas: He, Ar, Kr, or Xe. These studies showed strong blue wing absorption to the short wavelength side of the alkali atom D2 lines due to collisionally formed Cs- or Rb-rare gas excimers. We also have observed an efficient two photon excitation of higher lying states in Cs and Rb that produces both intense blue emission and IR atomic emission in the 1.3 to 3.8 μm spectral region.We describe a series of measurements of absorption and laser induced fluorescence on cells that contained cesium and rubidium and a rare gas: He, Ar, Kr, or Xe. These studies showed strong blue wing absorption to the short wavelength side of the alkali atom D2 lines due to collisionally formed Cs- or Rb-rare gas excimers. We also have observed an efficient two photon excitation of higher lying states in Cs and Rb that produces both intense blue emission and IR atomic emission in the 1.3 to 3.8 μm spectral region.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEFeb 11, 20103 citations

Optical Absorption Spectra of Cesium Atoms in Rare-Gas Matrices

Teinosuke Kanda, Takeo Ebisu

Journal of the Physical Society of JapanSep 1, 19714 citations

Saturated absorption and electromagnetically induced transparency of residual rubidium in dense cesium vapor

Armen D. Sargsyan, Anahit L. Gogyan, David G. Sarkisyan

In the sealed-off cesium vapor cell studied in this work, a residual rubidium fraction of approximately $\sim $1\% was observed. We investigate the optical response of these trace Rb atoms in a sealed 1~cm long Cs-filled vapor cell. Despite the low concentration, laser excitation at 795~nm allows the observation of saturated absorption and electromagnetically induced transparency (EIT) resonances. The surrounding Cs vapor effectively acts as a buffer medium, reducing the Rb atomic velocity and increasing the interaction time with the laser field, which improves the EIT signal. The experiments are performed in an all-sapphire cell that can be heated up to 500$ ^{\circ}$C without window blackening, unlike conventional glass cells. From the measured spectra, Cs--Rb collisional cross sections are estimated. These results show that residual atomic species in high-temperature vapor cells can be exploited for spectroscopic and nonlinear-optical studies.In the sealed-off cesium vapor cell studied in this work, a residual rubidium fraction of approximately $\sim$1\% was observed. We investigate the optical response of these trace Rb atoms in a sealed 1~cm long Cs-filled vapor cell. Despite the low concentration, laser excitation at 795~nm allows the observation of saturated absorption and electromagnetically induced transparency (EIT) resonances. The surrounding Cs vapor effectively acts as a buffer medium, reducing the Rb atomic velocity and increasing the interaction time with the laser field, which improves the EIT signal. The experiments are performed in an all-sapphire cell that can be heated up to 500$^{\circ}$C without window blackening, unlike conventional glass cells. From the measured spectra, Cs--Rb collisional cross sections are estimated. These results show that residual atomic species in high-temperature vapor cells can be exploited for spectroscopic and nonlinear-optical studies.

arXiv:2603.09284Mar 10, 20260 citations

Radiation trapping and spatial distribution of the Cs(6P_(3/2)) atoms in the vapor mixed with Ar

Yifan Shen

The effective radiative rate for Cs(6P3/2) resonance level in the presence of Ar is determined.Cs atoms were excited to the 6P3/2 state using a single-mode diode laser(pump laser).The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam(probe laser),tuned to the 6P3/28S1/2 transition which could be translated parallel to the pump beam.In the presence of radiation trapping,the spontaneous radiation rate is multiplied by the transmission factor T6p3/26S1/2,which describes the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed.Position dependent 6P3/2 state densities had been combined with the collisional broadening rate 6P3/26S1/2 line due to both Ar and cesium perturbers to yield the T6p3/26S1/2.The effective radiative rates of the Cs D2 line as a function of the Ar pressure PAr were obtained.The fluorescence intensity I852 of the 6P3/26S1/2emission was measured simultaneously.The measured fluorescence ratios determined the ratios of the effective radiative rates at different Ar density.These ratios are in agreement with theoretical evaluation.The effective radiative rate for Cs(6P3/2) resonance level in the presence of Ar is determined.Cs atoms were excited to the 6P3/2 state using a single-mode diode laser(pump laser).The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam(probe laser),tuned to the 6P3/28S1/2 transition which could be translated parallel to the pump beam.In the presence of radiation trapping,the spontaneous radiation rate is multiplied by the transmission factor T6p3/26S1/2,which describes the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed.Position dependent 6P3/2 state densities had been combined with the collisional broadening rate 6P3/26S1/2 line due to both Ar and cesium perturbers to yield the T6p3/26S1/2.The effective radiative rates of the Cs D2 line as a function of the Ar pressure PAr were obtained.The fluorescence intensity I852 of the 6P3/26S1/2emission was measured simultaneously.The measured fluorescence ratios determined the ratios of the effective radiative rates at different Ar density.These ratios are in agreement with theoretical evaluation.

Jiguang zazhiJan 1, 20080 citations

Optical double-resonance spectroscopy of trapped Cs atoms: hyperfine structure of the 8s and 6d excited states

C. Fort, F. S. Cataliotti, Piera Raspollini +2 more

Zeitschrift für Physik D Atoms Molecules and ClustersJun 1, 199522 citations

In the sealed-off cesium vapor cell studied in this work, a residual rubidium fraction of approximately $\sim

1\% was observed. We investigate the optical response of these trace Rb atoms in a sealed 1~cm long Cs-filled vapor cell. Despite the low concentration, laser excitation at 795~nm allows the observation of saturated absorption and electromagnetically induced transparency (EIT) resonances. The surrounding Cs vapor effectively acts as a buffer medium, reducing the Rb atomic velocity and increasing the interaction time with the laser field, which improves the EIT signal. The experiments are performed in an all-sapphire cell that can be heated up to 500

^{\circ}$C without window blackening, unlike conventional glass cells. From the measured spectra, Cs--Rb collisional cross sections are estimated. These results show that residual atomic species in high-temperature vapor cells can be exploited for spectroscopic and nonlinear-optical studies.