Radiative deflection of a BaF molecular beam via optical cycling

Chen, Tao; Bu, Wenhao; Yan, Bo

doi:10.1103/physreva.96.053401

Cited by 47 publications

(28 citation statements)

References 41 publications

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“…Although molecules have complex level structures that make them difficult to cool, there are a few that have almost closed electronic transitions suitable for laser cooling. So far, laser cooling has been demonstrated for SrF [52][53][54][55], YO [56], CaF [57][58][59], YbF [60], and SrOH [61], with several other species being pursued [62][63][64][65].…”

Section: Introductionmentioning

confidence: 99%

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

et al. 2020

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We investigate the effects of static electric and magnetic fields on the differential ac Stark shifts for microwave transitions in ultracold bosonic 87 Rb 133 Cs molecules, for light of wavelength λ = 1064 nm. Near this wavelength we observe unexpected two-photon transitions that may cause trap loss. We measure the ac Stark effect in external magnetic and electric fields, using microwave spectroscopy of the first rotational transition. We quantify the isotropic and anisotropic parts of the molecular polarizability at this wavelength. We demonstrate that a modest electric field can decouple the nuclear spins from the rotational angular momentum, greatly simplifying the ac Stark effect. We use this simplification to control the ac Stark shift using the polarization angle of the trapping laser.

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Section: Introductionmentioning

confidence: 99%

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

et al. 2020

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“…The Doppler cooling force for BaF molecules is calculated with the multi-level master equation model [34,37,38]. We only consider the main cooling laser and ignore the leakage channels to higher vibrational states and the A 2 ∆ state, i.e., the "4+12"-level model.…”

Section: Results and Analysismentioning

confidence: 99%

“…In order to cover the hyperfine states, we use acoustic-optical modulators (AOM) to shift the frequency of cooling laser to produce multi-frequency components with relative frequencies of {0, 17, 123, 151} MHz. For the repump laser, a 38 MHz modulated electro-optical modulator (EOM) is used to produce {±1, ±2} sidebands to cover the hyperfine splitting [34].…”

Section: Energy Levels Involved In Laser Coolingmentioning

confidence: 99%

“…Thus, several groups are pushing on the direction of laser cooling of BaF. The high-resolution spectrum involved in laser cooling has been measured in a buffer-gas cell [32,33]; The deflection of BaF molecular beam by lasers has been observed [34]. But similar with BaH [15] and YbF molecules [14], the laser cooling of BaF is more difficult than light molecules.…”

Section: Introductionmentioning

confidence: 99%

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Doppler cooling of buffer-gas-cooled Barium monofluoride molecules

Zhang,

Zeng,

Liang

et al. 2022

Preprint

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We demonstrate one-dimensional Doppler cooling of a beam of buffer-gas cooled Barium monofluoride (BaF) molecules. The dependences of the cooling efficiency with the laser detuning, the bias filed and the laser intensity are carefully measured. We numerical simulate our experiment with a Monte Carlo method, and find the theoretic predictions consists with our experimental data. This result represents a key step towards further cooling and trapping of BaF molecules.

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“…This is typically two orders of magnitude larger than what is obtained with supersonic beams [7]. From cryogenic buffer gas cooling, molecules suitable to laser cooling can even be cooled further: SrF and CaF have been sufficiently decelerated and loaded in a magneto-optical trap [8,9] and, according to recent advances [10], it may be thought that the same feat is at hand with BaF. However this might be difficult because BaF has a larger mass and less favorable optical cycling properties than the two other molecules [11].…”

Section: Introductionmentioning

confidence: 99%

Efficient rotational cooling of a cold beam of barium monofluoride

et al. 2022

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In our experiment, molecules of barium monofluoride, initially formed at high temperature due to a laser ablation process, are almost immediately cooled by an adiabatic expansion of argon. Our measurements show that the rotational temperature of the resulting molecular beam is about T_{{\rm rot}}\approx12 K. We demonstrate that the rotation can be cooled to approximately T_{{\rm rot}}\approx0.8 K through an optical pumping of the internal degrees of freedom. This optoical manipulation relies on two light sources coming from tapered amplifiers whose spectra extend over several tens of gigahertz. The first source, dedicated to the rotational cooling of molecules occupying the fundamental vibrational level, is optimized thanks to a spectral shaping whose resolution is comparable to the separation of the relevant rotational levels. The second source is used to pump the molecules back to the fundamental vibrational level when they escape from it. This work focuses on the relevant features of these two types of optical pumping.

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Radiative deflection of a BaF molecular beam via optical cycling

Cited by 47 publications

References 41 publications

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

Controlling the ac Stark effect of RbCs with dc electric and magnetic fields

Doppler cooling of buffer-gas-cooled Barium monofluoride molecules

Efficient rotational cooling of a cold beam of barium monofluoride

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