Rectification effect of a radiation force

Kazantsev, A. P.; Krasnov, I. V.

doi:10.1364/josab.6.002140

Cited by 66 publications

(75 citation statements)

References 3 publications

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“…This demonstration of a rectified force was striking and confirmed the theoretical ideas of Kazantsev et al [10], Voitsekhovich et al [11], and Javanainen [12].…”

Section: Np Bigelow Et Alsupporting

confidence: 86%

“…[10,[12][13]. These experiments also made an important conceptual point: the twocolor force is not necessarily the sum of the two one-color forces.…”

Section: Np Bigelow Et Almentioning

confidence: 99%

“…Particular attention has been paid to the case of a two-level atom (TLA) interacting with a twodimensional (2D) light field. In 1989 Kazantsev and Krasanov [10] pointed out that such an atom can experience a spontaneous light pressure force which can have a vortex texture. This result is somewhat surprising because there is no net averaged momentum flow into or out of the twodimensional field so that one might expect that W = 0 and hence that'F sp = 0.…”

Section: The Force On a Tla In A Monochromatic 2d Laser Field: Vorticmentioning

confidence: 99%

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Laser Cooling: Beyond One Field and One Dimension

Bigelow

Cas

et al. 1994

Acta Phys. Pol. A

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We describe recent experimental and theoretical results which show that the light pressure force for an atom with more than two levels, in a field with more than one frequency or which is studied in more than one dimension can display striking new features. The importance of these results lies in the fact that they cannot be explained in terms of a two-level, a monochromatic or a one-dimensional theory.

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“…This demonstration of a rectified force was striking and confirmed the theoretical ideas of Kazantsev et al [10], Voitsekhovich et al [11], and Javanainen [12].…”

Section: Np Bigelow Et Alsupporting

confidence: 86%

“…[10,[12][13]. These experiments also made an important conceptual point: the twocolor force is not necessarily the sum of the two one-color forces.…”

Section: Np Bigelow Et Almentioning

confidence: 99%

Section: The Force On a Tla In A Monochromatic 2d Laser Field: Vorticmentioning

confidence: 99%

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Laser Cooling: Beyond One Field and One Dimension

Bigelow

Cas

et al. 1994

Acta Phys. Pol. A

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“…The idea of using stimulated slowing and cooling (first for atoms) dates back to the end of 1980s when the rectified dipole force was theoretically proposed [29,36] and experimentally observed for sodium atoms [37,38]. Using two standing light waves of different frequencies and detunings, the dipole force can be rectified to apply force on atoms on the macroscopic spatial scale.…”

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confidence: 99%

Coherent Bichromatic Force Deflection of Molecules

et al. 2018

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We demonstrate the coherent optical bichromatic force on a molecule, the polar free radical strontium monohydroxide (SrOH). A dual-frequency retro-reflected laser beam addressing theX 2 Σ + ↔Ã 2 Π 1/2 electronic transition coherently imparts momentum onto a cryogenic beam of SrOH. This directional photon exchange creates a bichromatic force that transversely deflects the molecules. By adjusting the relative phase between the forward and counter propagating laser beams we reverse the direction of the applied force. A momentum transfer of 70 k is achieved with minimal loss of molecules to dark states. Modeling of the bichromatic force is performed via direct numerical solution of the time-dependent density matrix and is compared with experimental observations. Our results open the door to further coherent manipulation of molecular motion, including the efficient optical deceleration of diatomic and polyatomic molecules with complex level structures.Laser manipulation of atomic motion has revolutionized atomic, molecular and optical (AMO) physics [1,2]. The widely-used techniques of laser cooling and trapping made possible the creation of ultracold degenerate quantum gases [3], simulation of important condensed matter models [4] and development of new quantum sensors [5,6] and clocks [7]. Laser deceleration and cooling of atomic beams -a necessary part of the trap loading process -typically requires scattering tens of thousands of photons in order to bring room (or oven) temperature atoms to velocities where they can be confined by electromagnetic traps for further studies [8]. While beam deceleration employing the spontaneous radiation pressure force has been a standard for atomic experiments, its application to slowing molecular beams has been limited by the small change in kinetic energy per scattered photon and the myriad of internal molecular states, which inhibits photon cycling. At the same time, there is extreme interest in creating ultracold molecules for new physics applications [9].Neutral diatomic molecules are predicted to play an important role in diverse research areas of modern physics such as quantum simulation [10] and computation [11], as well as searches for new particles and fields beyond the Standard Model [12]. Larger polyatomic molecules will provide additional opportunities in physics and chemistry [13][14][15]. For example, exploring the origin of biomolecular homochirality [16] and understanding primordial chemistry leading to the development of organic life requires the use of large molecules [17]. However, these molecules' complexity presents significant challenges for direct laser slowing and cooling. Yet these are the key ingredients that allow for optical trapping, which, in turn, realizes long moleculelaser coherence times and high levels of quantum state control. Previously, the external motion of gas-phase polyatomic molecules has been manipulated with off-resonant laser fields [18] as well as electric [19], magnetic [20], and mechanical techniques [21]. Inspired by the success of...

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“…The optical plugs are regions of intersection of bichromatic laser beams localized near the face walls (W). In these regions, a rectified gradient force (RGF) 1 and a frictional force [10,11], directed as shown in Fig. 1, act on the resonance ions.…”

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confidence: 99%

Bichromatic magnetooptical trap for ultracold plasmas

Krasnov

2007

Russ Phys J

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It is shown that rectified radiative forces (a frictional force and a rectified gradient force) in crossed Gaussian bichromatic light beams can be used to solve the problem of long-term confinement of an ultracold plasma with resonance ions. The effect of plasma confinement during ∼2 min can be attained at beam intensities not above several watts per square centimeter.A logical continuation of the investigations on application of methods of laser cooling and confinement of resonance particles that have intensely developed for already three decades [1-3] is their extension [4-6] to a qualitatively new object -ultracold plasma (UCP). UCP is a classical electron-ion plasma with ultralow (compared to typical of laboratory plasmas [7]) temperatures of ions (T i ≤ 1 K) and electrons (T e ≤ 100 K). The fundamental interest in laser UCP's is due to the opening unique prospects for laboratory studies of strongly interacting (imperfect) Coulomb systems of low density, in particular, of the features of liquid-crystal phase transformations and of the recombinational, collisional, and collective processes in systems of this type [5,6,8,9]. Now the basic method of producing UCP's, realized for the first time at the National Institute of Standards and Technologies of the USA [4], is near-threshold photoionization of cooled atoms by pulsed laser radiation. With this method, short-lived UCP's can be produced with the lifetime τ ∼ 100 µs, which is determined by the time of free expansion of the plasma [4,5]. For the production of long-lived UCP's with controllable characteristics [6], adequate methods of their longterm confinement should be developed.This paper presents a nonconventional solution of this problem in plasma physics based on using rectified radiative forces significant in magnitude [10, 11] which act on resonance plasma ions in crossed bichromatic light beams. Figure 1 gives a schematic diagram of the proposed magnetooptical trap (MOT) for nonisothermal ( << i e T T )UCP's with resonance ions. Transverse (in relation to the axis of the plasma column) confinement of UCP is realized by a uniform magnetic field. The principal components of the MOT that provides long-term longitudinal confinement of UCP are dissipative "optical plugs" (OP's). The optical plugs are regions of intersection of bichromatic laser beams localized near the face walls (W). In these regions, a rectified gradient force (RGF) 1 and a frictional force [10,11], directed as shown in Fig. 1, act on the resonance ions. In other words, an OP plays the role of a light partition possessing direction selectivity, such that it hampers the transmission of particles only from a certain side of the OP. For this to take place, the RGF should have a potential shaped as a smoothed step oriented toward the region of the UCP column bulk and the step height 0 U should satisfy the condition 1 RGF is a force of resonance light pressure on particles which arises in a nonuniform bichromatic field and possesses the following property: it has the order of magnitude of the ...

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Rectification effect of a radiation force

Cited by 66 publications

References 3 publications

Laser Cooling: Beyond One Field and One Dimension

Laser Cooling: Beyond One Field and One Dimension

Coherent Bichromatic Force Deflection of Molecules

Bichromatic magnetooptical trap for ultracold plasmas

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