Physical Review A

Detection of a two-photon transition by stimulated emission: Amplification and circular birefringence

Stefano Sanguinetti, E. Murè, P. Minguzzi

Published Feb 20, 2007• 3 citations

Abstract

We present the detection of a two-photon transition based on stimulated emission. This measurement was performed in rubidium for the $5S\text{\ensuremath{-}}5{D}_{5∕2}\text{\ensuremath{-}}5{P}_{3∕2}$ transition, using two low-cost diode lasers. Several detection schemes were tested. We reached the best results by probing the circular birefringence of the excited vapor, with the polarization analysis of the amplified laser beam.

DOI: 10.1103/physreva.75.023408

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Physical Review A

Detection of a two-photon transition by stimulated emission: Amplification and circular birefringence

Stefano Sanguinetti, E. Murè, P. Minguzzi

Published Feb 20, 2007• 3 citations

Publisher

Abstract

We present the detection of a two-photon transition based on stimulated emission. This measurement was performed in rubidium for the

5S\text{\ensuremath{-}}5{D}_{5∕2}\text{\ensuremath{-}}5{P}_{3∕2}

transition, using two low-cost diode lasers. Several detection schemes were tested. We reached the best results by probing the circular birefringence of the excited vapor, with the polarization analysis of the amplified laser beam.

DOI: 10.1103/physreva.75.023408

Related papers

A laser spectroscopy system with combined absorption, polarization rotation and fluorescence detection to study two photon transitions in atomic rubidium

O López-Hernández, Santiago Hernández-Gómez, F. Ponciano-Ojeda +6 more

The design and construction of an experimental system for studying two photon spectroscopy processes in atomic rubidium is presented. It is designed to measure absorption and polarization rotation induced by any of the two laser beams and also the visible fluorescence that results from decay of the excited states. Two home-built diode lasers are used to produce the optical fields that later interact with room temperature rubidium atoms. Using counterpropagating beams allows velocity selection of the groups of atoms that interact with both laser beams. The system was tested in the 5 S?5 P3/2 ?5 Dj ladder energy level configuration of atomic rubidium. Blue fluorescence (420 nm) that results from decay of the intermediate 6Pj states is filtered and then measured with a photomultiplier tube. Absorption and fluorescence spectra provide mutually complementary information about the interaction between the rubidium atoms and the two optical fields. All Rights Reserved © 2015 Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico. This is an open access item distributed under the Creative Commons CC License BY-NC-ND 4.0.The design and construction of an experimental system for studying two photon spectroscopy processes in atomic rubidium is presented. It is designed to measure absorption and polarization rotation induced by any of the two laser beams and also the visible fluorescence that results from decay of the excited states. Two home-built diode lasers are used to produce the optical fields that later interact with room temperature rubidium atoms. Using counterpropagating beams allows velocity selection of the groups of atoms that interact with both laser beams. The system was tested in the 5 S?5 P3/2 ?5 Dj ladder energy level configuration of atomic rubidium. Blue fluorescence (420 nm) that results from decay of the intermediate 6Pj states is filtered and then measured with a photomultiplier tube. Absorption and fluorescence spectra provide mutually complementary information about the interaction between the rubidium atoms and the two optical fields. All Rights Reserved © 2015 Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico. This is an open access item distributed under the Creative Commons CC License BY-NC-ND 4.0.

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S. B. Bayram, Ramesh Marhatta

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Sub-Doppler two-photon absorption induced by the combination of a single-mode laser and a frequency comb

Marco Polo Moreno de Souza, Giovana Trevisan Nogueira, D. Felinto +1 more

The two-photon transition $5S\ensuremath{-}5P\ensuremath{-}5D$ in rubidium vapor is investigated by detecting the fluorescence from the $6{P}_{3/2}$ state when the atomic system is excited by the combined action of a cw diode laser and a frequency comb. The cw laser plays a role as a velocity-selective filter and allows for sub-Doppler spectroscopy over a large spectral range including the $5{D}_{3/2}$ and $5{D}_{5/2}$ states. For a counterpropagating beam configuration, the response of each atomic velocity group is well characterized within the Doppler profile and the excited hyperfine levels are clearly resolved. The contribution of the optical pumping to the direct two-photon process is also revealed. The results are well described in a frequency domain picture by considering the interaction of each velocity group with the cw laser and the modes of the frequency comb.The two-photon transition $5S\ensuremath{-}5P\ensuremath{-}5D$ in rubidium vapor is investigated by detecting the fluorescence from the $6{P}_{3/2}$ state when the atomic system is excited by the combined action of a cw diode laser and a frequency comb. The cw laser plays a role as a velocity-selective filter and allows for sub-Doppler spectroscopy over a large spectral range including the $5{D}_{3/2}$ and $5{D}_{5/2}$ states. For a counterpropagating beam configuration, the response of each atomic velocity group is well characterized within the Doppler profile and the excited hyperfine levels are clearly resolved. The contribution of the optical pumping to the direct two-photon process is also revealed. The results are well described in a frequency domain picture by considering the interaction of each velocity group with the cw laser and the modes of the frequency comb.

arXiv:1706.03237Physical Review AAug 31, 20173 citations

We present the detection of a two-photon transition based on stimulated emission. This measurement was performed in rubidium for the

5S\text{\ensuremath{-}}5{D}_{5∕2}\text{\ensuremath{-}}5{P}_{3∕2}

We have experimentally investigated the anisotropy-dependent circular polarization spectra of the

^{133}\mathrm{Cs}

$6s^{2}S_{1∕2}\ensuremath{\rightarrow}6p^{2}P_{3∕2}\ensuremath{\rightarrow}10s^{2}S_{1∕2}$ double-resonance transition in the presence of Ar. Satisfaction of double-resonance condition, achieved by use of a two-photon two-color pulse laser excitation scheme, was monitored by measurement of the intensity of the $9p^{2}P_{1∕2}\ensuremath{\rightarrow}6s^{2}S_{1∕2}$ cascade fluorescence at

361.73\phantom{\rule{0.3em}{0ex}}\mathrm{nm}

. In the experiment anisotropies, namely, alignment and orientation in the

6p^{2}P_{3∕2}

level, were produced from circularly polarized light with positive helicity. Then, a circular polarization degree was measured when both lasers were circularly polarized with positive helicities, and alternately positive and negative helicities for the $6p^{2}P_{3∕2}\ensuremath{\rightarrow}10s^{2}S_{1∕2}$ transition. From the measurement, we obtained the orientation-dependent depolarization cross section in the

6p^{2}P_{3∕2}

level due to collisions with ground-level argon atoms. A disorientation cross section value of 151

(42)\phantom{\rule{0.3em}{0ex}}{\mathrm{\AA{}}}^{2}

is reported.

The two-photon transition $5S\ensuremath{-}5P\ensuremath{-}5D$ in rubidium vapor is investigated by detecting the fluorescence from the

6{P}_{3/2}

state when the atomic system is excited by the combined action of a cw diode laser and a frequency comb. The cw laser plays a role as a velocity-selective filter and allows for sub-Doppler spectroscopy over a large spectral range including the

5{D}_{3/2}

and

5{D}_{5/2}

states. For a counterpropagating beam configuration, the response of each atomic velocity group is well characterized within the Doppler profile and the excited hyperfine levels are clearly resolved. The contribution of the optical pumping to the direct two-photon process is also revealed. The results are well described in a frequency domain picture by considering the interaction of each velocity group with the cw laser and the modes of the frequency comb.