International Conference Laser Optics (ICLO)

Laser cooling and trapping of 87Rb atoms in pure-optical two-frequency light trap

R. Ya. Ilenkov, Прудников Олег Николаевич, A. V. Taichenachev, Valeriy I. Yudin

Published Jul 1, 2024• 0 citations

Abstract

The laser cooling and trapping of ${ }^{87} \mathbf{R b}$ atoms in pure-optical two frequency trap is studied in details. The parameter ranges in which optimal laser cooling is achieved were studied for the first time. The atoms can be simultaneously cooled and trapped by bichromatic laser field that opens up possibility to realize principally new type of pure optical trap. The depth of our trap is hundreds of spontaneous relaxation frequencies which corresponds to the depth of the magneto-optical traps used in the experiments.

DOI: 10.1109/iclo59702.2024.10624377

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International Conference Laser Optics (ICLO)

Laser cooling and trapping of 87Rb atoms in pure-optical two-frequency light trap

R. Ya. Ilenkov, Прудников Олег Николаевич, A. V. Taichenachev, Valeriy I. Yudin

Published Jul 1, 2024• 0 citations

Publisher

Abstract

The laser cooling and trapping of

{ }^{87} \mathbf{R b}

atoms in pure-optical two frequency trap is studied in details. The parameter ranges in which optimal laser cooling is achieved were studied for the first time. The atoms can be simultaneously cooled and trapped by bichromatic laser field that opens up possibility to realize principally new type of pure optical trap. The depth of our trap is hundreds of spontaneous relaxation frequencies which corresponds to the depth of the magneto-optical traps used in the experiments.

DOI: 10.1109/iclo59702.2024.10624377

Related papers

A Macroscopic Dissipative Optical Trap for 87Rb Atoms Created by a Bichromatic Light Field

R. Ya. Ilenkov, O. N. Prudnikov, Anastasiia A. Kirpichnikova +2 more

Bulletin of the Russian Academy of Sciences PhysicsMay 1, 20260 citations

Two-species magneto-optical trap with 40K and 87Rb

J. Goldwin, Scott B. Papp, Brian DeMarco +1 more

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Прудников Олег Николаевич, R. Ya. Ilenkov, A. V. Taichenachev +2 more

We show the possibility of implementing a deep dissipative optical lattice for neutral atoms with a macroscopic period. The depth of the lattice can reach magnitudes comparable to the depth of the magneto-optical traps (MOT), while the presence of dissipative friction forces allows for trapping and cooling of atoms. The area of localization of trapped atoms reaches sub-millimeter size, and the number of atoms is comparable to the number trapped in MOT. As an example, we study lithium atoms for which the macroscopic period of the lattice $Λ=1.5$ cm. Such deep optical lattices with a macroscopic period open up possibility for developing effective methods for cooling and trapping neutral atoms without use of magnetic field as an alternative to MOT. This is important for developing compact systems based on cold atoms.We show the possibility of implementing a deep dissipative optical lattice for neutral atoms with a macroscopic period. The depth of the lattice can reach magnitudes comparable to the depth of the magneto-optical traps (MOT), while the presence of dissipative friction forces allows for trapping and cooling of atoms. The area of localization of trapped atoms reaches sub-millimeter size, and the number of atoms is comparable to the number trapped in MOT. As an example, we study lithium atoms for which the macroscopic period of the lattice $Λ=1.5$ cm. Such deep optical lattices with a macroscopic period open up possibility for developing effective methods for cooling and trapping neutral atoms without use of magnetic field as an alternative to MOT. This is important for developing compact systems based on cold atoms.

arXiv:2306.13294Jun 23, 20230 citations

The laser cooling and trapping of

{ }^{87} \mathbf{R b}

We trap and cool a gas composed of

{}^{40}\mathrm{K}

and

{}^{87}\mathrm{Rb},

using a two-species magneto-optical trap (MOT). This trap represents the first step towards cooling the Bose-Fermi mixture to quantum degeneracy. Laser light for the MOT is derived from laser diodes and amplified with a single high-power semiconductor amplifier chip. The four-color laser system is described, and the single-species and two-species MOTs are characterized. Atom numbers of $1\ifmmode\times\else\texttimes\fi{}{10}^{7}$

{}^{40}\mathrm{K}

and $2\ifmmode\times\else\texttimes\fi{}{10}^{9}$

{}^{87}\mathrm{Rb}

are trapped in the two-species MOT. Observation of trap loss due to collisions between species is presented and future prospects for the experiment are discussed.

We consider a laser cooling and trapping of alkaline-earth and similar atoms in a bichromatic field resonant to a closed optical transition

^1S_0 \to \, ^1P_1

^1S_0 \to \, ^3P_1

. It is shown that new kinetic effects emerge compared to monochromatic fields, enabling the formation of a deep macroscopic trap capable of capturing and cooling neutral atoms to sub-Doppler temperatures. Such a purely optical macroscopic trap can serve as an alternative to the well-known magneto-optical trap and can be used in applications requiring minimization of the magnetic field in the cold atom cloud region. The obtained results are of interest for the new generation of quantum sensors and optical frequency standards.

Λ=1.5

cm. Such deep optical lattices with a macroscopic period open up possibility for developing effective methods for cooling and trapping neutral atoms without use of magnetic field as an alternative to MOT. This is important for developing compact systems based on cold atoms.