Transverse spin forces and non-equilibrium particle dynamics in a circularly polarized vacuum optical trap

A useful tool that can achieve a high level of spin polarization is a circularly polarized far off-resonance dipole force trap (CFORT). This work is the first step in its development; building the necessary components to successfully load stable 39K into a linearly polarized far off-resonance trap (FORT) from a magneto-optical trap, where the atoms are precooled to a temperature of 400 μK. The FORT consists of 700 mW of light from a titanium–sapphire ring laser, focused with a 200 mm achromatic lens to a waist of 35 μm. The light is detuned between 1 and 20 nm to the red of the D1 transition and this gives rise to trap depths in the region of a few milliKelvin. A characterization of the FORT's loading efficiency and lifetime as a function of FORT beam detuning, power, and ellipticity are studied. PACS Nos.: 32.80.Pj, 23.40.–s, 39.25.+k

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Cold Atoms in a Hollow Mirror Trap

International Journal of Modern Physics B ◽

10.1142/s0217979297001611 ◽

1997 ◽

Vol 11 (28) ◽

pp. 3311-3317

Author(s):

J. A. Kim ◽

K. I. Lee ◽

H. Nha ◽

H. R. Noh ◽

W. Jhe

Keyword(s):

Laser Beam ◽

Cold Atoms ◽

Optical Trap ◽

Statistical Properties ◽

Magneto Optical Trap ◽

Atom Trap ◽

Circularly Polarized ◽

Rubidium Atoms ◽

Quantum Statistical ◽

Polarization Configuration

We present a novel and simple vapour-cell magneto-optical atom trap in a pyramidal and a conical hollow mirror cavity. A single laser beam having modulation sidebands at microwaves is used for cooling, trapping and repumping of rubidium atoms. When the laser is circularly polarized and sent into the hollow region, three pairs of counterpropagating beams are automatically produced therein, having the same polarization configuration as in the conventional six beam magneto-optical trap. The precooled atom sources thus produced may be used to obtain much colder and denser atoms for study of their quantum statistical properties.

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Mirror magneto-optical trap using circularly polarized light-emitting optical fibers

Applied Optics ◽

10.1364/ao.45.003629 ◽

2006 ◽

Vol 45 (15) ◽

pp. 3629

Author(s):

Masaharu Hyodo ◽

Kazuyuki Nakayama ◽

Ryuzo Ohmukai ◽

Kazuyoshi Kurihara ◽

Masayoshi Watanabe

Keyword(s):

Optical Fibers ◽

Optical Trap ◽

Polarized Light ◽

Magneto Optical Trap ◽

Circularly Polarized Light ◽

Light Emitting ◽

Circularly Polarized

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On the resonant particle dynamics in the field of a finite-amplitude circularly polarized wave propagating along the axis of a magnetic trap

Physics of Plasmas ◽

10.1063/1.872894 ◽

1998 ◽

Vol 5 (6) ◽

pp. 2210-2216 ◽

Cited By ~ 3

Author(s):

V. L. Krasovsky ◽

H. Matsumoto

Keyword(s):

Magnetic Trap ◽

Particle Dynamics ◽

Finite Amplitude ◽

Circularly Polarized

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Dual optical trap created by tightly focused circularly polarized ring Airy beam

Journal of Quantitative Spectroscopy and Radiative Transfer ◽

10.1016/j.jqsrt.2020.106851 ◽

2020 ◽

Vol 244 ◽

pp. 106851

Author(s):

Zaili Chen ◽

Yunfeng Jiang

Keyword(s):

Optical Trap ◽

Circularly Polarized ◽

Airy Beam

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Rotation of an elliptical dielectric particle in the focus of a circularly polarized Gaussian beam

Computer Optics ◽

10.18287/2412-6179-co-693 ◽

2020 ◽

Vol 44 (4) ◽

pp. 561-567

Author(s):

A.G. Nalimov

Keyword(s):

Numerical Simulation ◽

Optical Axis ◽

Spherical Wave ◽

Fdtd Method ◽

Optical Trap ◽

Transverse Plane ◽

Diffraction Field ◽

Circularly Polarized ◽

Trapping Force ◽

Optical Torque

A force and a torque exerted on an elliptical dielectric particle in the focus of a spherical circularly polarized laser beam are considered. The numerical simulation is conducted using a diffraction field obtained by an FDTD method, with the force and torque derived using a Maxwell’s stress tensor. It is shown that an optical torque is exerted on the center of an elliptical particle put in the focus of a circularly polarized spherical wave, making it rotate around the optical axis. The rotation occurs when the elliptical microparticle is situated in a transverse plane to the optical axis. When shifting the ellipsoid from the optical axis, an optical trapping force appears that prevents its displacement, meaning that the particle finds itself in an optical trap on the optical axis.

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