Simulations of the bichromatic force in multilevel systems

Aldridge, Leland; Galica, Scott; Eyler, E. E.

doi:10.1103/physreva.93.013419

Cited by 27 publications

(46 citation statements)

References 33 publications

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“…[101] Following successful experimental resultsf or atomic beams, there has been different new schemes proposed forefficient laser slowing of diatomic molecules on both electronic [111][112][113] and vibrational transitions. like done for CaF [112] )w ill be necessary in order to precisely determine suitable experimental parameters. like done for CaF [112] )w ill be necessary in order to precisely determine suitable experimental parameters.…”

Section: Coherent Slowingmentioning

confidence: 99%

“…However, our proposed optical cycling scheme delivering

\sim 10^{3}

scattered photons per molecule opens a path towards the use of coherent optical bichromatic forces (BCF) for rapid deceleration of MOR originating from a CBGB to near the capture velocity of a molecular MOT,

v_{cap} \sim 10 {ms}^{- 1}

. Following successful experimental results for atomic beams, there has been different new schemes proposed for efficient laser slowing of diatomic molecules on both electronic and vibrational transitions . While we surmise that these techniques could be applied to MOR species, detailed simulations of the bichromatic force in complex multilevel systems (e.g.…”

Section: Applicationsmentioning

confidence: 99%

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Proposal for Laser Cooling of Complex Polyatomic Molecules

et al. 2016

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An experimentally feasible strategy for direct laser cooling of polyatomic molecules with six or more atoms is presented. Our approach relies on the attachment of a metal atom to a complex molecule, where it acts as an active photon cycling site. We describe a laser cooling scheme for alkaline earth monoalkoxide free radicals taking advantage of the phase space compression of a cryogenic buffer-gas beam. Possible applications are presented including laser cooling of chiral molecules and slowing of molecular beams using coherent photon processes.

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Section: Coherent Slowingmentioning

confidence: 99%

“…However, our proposed optical cycling scheme delivering

\sim 10^{3}

v_{cap} \sim 10 {ms}^{- 1}

Section: Applicationsmentioning

confidence: 99%

Proposal for Laser Cooling of Complex Polyatomic Molecules

et al. 2016

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“…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 laser control of atomic motion as well as the latest developments in highpower CW and pulsed laser technology, many experimental proposals and theoretical calculations have been presented on using stimulated light forces for molecular beam slowing [22][23][24][25][26][27][28], yet there has been no successful experimental implementation.In this Letter, we demonstrate and characterize the optical bichromatic force (BCF) for molecules by deflecting a cryogenic buffer-gas beam (CBGB) of SrOH. Using dualfrequency high-power standing light waves we achieve significant force enhancement compared to radiative deflection.…”

mentioning

confidence: 99%

“…using stimulated light forces for molecular beam slowing [22][23][24][25][26][27][28], yet there has been no successful experimental implementation.…”

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confidence: 99%

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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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