Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Two-Photon Laser Cooling with the Rubidium Optical Clock Transition

Flávio C. Cruz, Wictor C. Magno

Published May 12, 2025• 0 citations
Publisher

Abstract

SummaryWe simulated laser cooling using the Rubidium two-color (780 & 776 nm) 5S1/2-5P3/2-5D5/2clock transition. Temperatures as low as 10 µK are obtained for laser parameters close to those used in a clock demonstration.
DOI
10.1109/eftf/ifcs64367.2025.11194538

Related papers

Observation of Superfluorescent Emissions from Laser Cooled Rb atoms*

Éric Paradis, B. Barrett, Anantharaman Kumarakrishnan +1 more

We present studies of superfluorescent pulses observed at 420.3 nm from a sample of laser cooled rubidium atoms that are excited to the 5D5/2 excited state by a two-photon transition from the 5S1/2 ground state.

Frontiers in Optics•Jan 1, 2006•0 citations

Two-color laser cooling with the rubidium optical clock transition

Wictor C. Magno, Flávio C. Cruz

Physical Review A•Jun 8, 2026•0 citations

Frequency stabilization of diode laser on the wavelength of 5P3/2→5D5/2of rubidium transition

A.Yu. Kalatskiy, Anton E. Afanasiev, Павел Николаевич Мелентьев +1 more

The method of frequency stabilization of diode laser on the wavelength of 5P3/2→5D5/2 of rubidium (776 nm) has been realized. The two-photon absorption spectroscopy of the rubidium vapors is underlie of the suggested scheme. The basic parameters such as the intensity of laser radiation and concentration of the vapors have been investigated. The frequency stability of radiation was about 1 MHz

EPJ Web of Conferences•Dec 13, 2016•0 citations

Investigation on the Monochromatic Two-Photon Transition Spectroscopy of Rubidium by Using Intensity Modulation Method

Sandan Wang, Jinpeng Yuan, Lirong Wang +2 more

We experimentally study the high-resolution two-photon spectroscopy of rubidium using a single laser. The 5S1/2 − 5P3/2 − 5D5/2 transition is realized via 778.1 nm laser beams acting on the vapor with a counter-propagating configuration. The intensity modulation method is employed to improve the signal-to-noise ratio of the spectrum by two orders of magnitude compared with that for direct measurement. The effects of the vapor temperature, the frequency-scanning speed of the laser, the polarization combination of the laser beams, and the laser power on the spectra are investigated to obtain the optimal experimental parameters. This research is expected to be beneficial for potential applications since it can be used to realize a compact and high-precision frequency standard for optical communication.

Journal of the Physical Society of Japan•Jul 18, 2018•7 citations

Two-photon excitation of launched cold atoms in flight

Rene C. Gonzalez, Eduardo Alejandro, Emma Erwin +1 more

We demonstrate two-photon bi-chromatic excitation of cold rubidium atoms in flight, using the pathway 5S1/2→5P3/2→5D5/2 with two resonant photons. In our experiment, Rb85 atoms are laser-cooled in a magneto-optical trap and launched upward in discrete clouds with a controllable vertical speed of 7.1±0.6 m/s and a velocity spread that is less than 10% of the launch speed. Outside the cooling beams, as high as 14 mm above the original center of the trap, the launched cold atoms are illuminated simultaneously by spatially localized horizontal excitation beams at 780 nm (5S1/2→5P3/2) and 776 nm (5P3/2→5D5/2). We monitor transmission of the 780-nm beam over a range of intensities of 780-nm and 776-nm light. As the center of the moving cloud passes the excitation beams, we observe as much as 97.9±1.2% transmission when the rate of two-photon absorption is high and the 5S1/2 and 5P3/2 states are depopulated, compared to 87.6±0.9% transmission if only the 780-nm beam is present. This demonstrates two-photon excitation of a launched cold-atom source with controllable launch velocity and narrow velocity spread, as a foundation for three-photon excitation to Rydberg states.

Journal of the Optical Society of America B•May 4, 2017•1 citation

Rubidium optical frequency standard with two-color EIT cooling and interrogation

Flávio C. Cruz, Wictor C. Magno

We analyze the feasibility of a cold 87Rb optical frequency standard based on the S-P-D transition in which two-color EIT laser cooling and interrogation are performed at 780 and 776 nm.

Latin America Optics and Photonics Conference•Jan 1, 2022•0 citations
We experimentally study the high-resolution two-photon spectroscopy of rubidium using a single laser. The 5S1/2 − 5P3/2 − 5D5/2 transition is realized via 778.1 nm laser beams acting on the vapor with a counter-propagating configuration. The intensity modulation method is employed to improve the signal-to-noise ratio of the spectrum by two orders of magnitude compared with that for direct measurement. The effects of the vapor temperature, the frequency-scanning speed of the laser, the polarization combination of the laser beams, and the laser power on the spectra are investigated to obtain the optimal experimental parameters. This research is expected to be beneficial for potential applications since it can be used to realize a compact and high-precision frequency standard for optical communication.
We demonstrate two-photon bi-chromatic excitation of cold rubidium atoms in flight, using the pathway 5S1/2→5P3/2→5D5/2 with two resonant photons. In our experiment, Rb85 atoms are laser-cooled in a magneto-optical trap and launched upward in discrete clouds with a controllable vertical speed of 7.1±0.6 m/s and a velocity spread that is less than 10% of the launch speed. Outside the cooling beams, as high as 14 mm above the original center of the trap, the launched cold atoms are illuminated simultaneously by spatially localized horizontal excitation beams at 780 nm (5S1/2→5P3/2) and 776 nm (5P3/2→5D5/2). We monitor transmission of the 780-nm beam over a range of intensities of 780-nm and 776-nm light. As the center of the moving cloud passes the excitation beams, we observe as much as 97.9±1.2% transmission when the rate of two-photon absorption is high and the 5S1/2 and 5P3/2 states are depopulated, compared to 87.6±0.9% transmission if only the 780-nm beam is present. This demonstrates two-photon excitation of a launched cold-atom source with controllable launch velocity and narrow velocity spread, as a foundation for three-photon excitation to Rydberg states.