Continuous all-optical deceleration and single-photon cooling of molecular beams

Jayich, A. M.; Vutha, Amar C.; Hummon, Matthew T.; Porto, J. V.; Campbell, W. C.

doi:10.1103/physreva.89.023425

Cited by 35 publications

(37 citation statements)

References 61 publications

(87 reference statements)

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“…The discussion here is limited to the special case of a two-level system and two frequencies of light. Moreover, there has been important work on multi-level systems (molecules) (Aldrich et al, 2016;Chieda and Eyler, 2011;Jayich et al, 2014), as well as on the use of four frequencies (Galica et al, 2013). Another important case is the use of two frequencies on a two-level system, but with two stages of deceleration in tandem (Chieda and Eyler, 2011).…”

Section: Origin Of the Forcementioning

confidence: 99%

Colloquium : Strong optical forces on atoms in multifrequency light

Metcalf

2017

Rev. Mod. Phys.

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Optical forces on atoms irradiated with a single frequency of light have been extensively studied for many years, both theoretically and experimentally. The two-level atom model has been used to describe a wide range of optical force phenomena and to exploit successfully a large range of applications. New areas of study were opened up when the multiple levels of real atoms were considered. In contrast, using multi-frequency light on a single atomic transition has not been studied as much, but using such light also results in very significant differences in the optical forces. This paper outlines the basic concepts of forces resulting from the use of two frequency light (bichromatic force) and swept frequency light (adiabatic rapid passage force). Both of these forces derive from stimulated processes only, and as a result can produce coherent exchange of momentum between atoms and light. The consequences are impressively larger forces with comparably larger velocity capture ranges, and even atom cooling without spontaneous emission.

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Section: Origin Of the Forcementioning

confidence: 99%

Colloquium : Strong optical forces on atoms in multifrequency light

Metcalf

2017

Rev. Mod. Phys.

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“…In the intervening time, optical cycling has been demonstrated in a number of diatomic species, leading to demonstration of laser cooling [18], radiation pressure slowing [19][20][21], and magneto-optical trapping in both two [22] and three dimensions [23,24]. Additionally, it has been proposed that the optical bichromatic force [25] or ultrafast stimulated slowing [26] can be used for molecular beam deceleration and cooling [27].…”

Section: Introductionmentioning

confidence: 99%

Prospects for a narrow line MOT in YO

et al. 2015

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In addition to being suitable for laser cooling and trapping in a magneto-optical trap (MOT) using a relatively broad ∼ ( 5 MHz) transition, the molecule YO possesses a narrow-line transition. This forbidden transition between the Σ X 2 and Δ ′ A 2 3 2 states has linewidth π ∼ × 2 160 kHz. After cooling in a MOT on the 614 nm Σ X 2 to Π A 2 1 2 (orange) transition, the narrow 690 nm (red) transition can be used to further cool the sample, requiring only minimal additions to the first stage system. We estimate that the narrow line cooling stage will bring the temperature from ∼1 mK to ∼10 μK, significantly advancing the frontier on direct cooling achievable for molecules.

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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.…”

mentioning

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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Continuous all-optical deceleration and single-photon cooling of molecular beams

Cited by 35 publications

References 61 publications

Colloquium : Strong optical forces on atoms in multifrequency light

Colloquium : Strong optical forces on atoms in multifrequency light

Prospects for a narrow line MOT in YO

Coherent Bichromatic Force Deflection of Molecules

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