Cold collision and high-resolution spectroscopy of buffer-gas-cooled BaF molecules

Bu, Wenhao; Chen, Tao; Lv, Guitao; Yan, Bo

doi:10.1103/physreva.95.032701

Cited by 30 publications

(23 citation statements)

References 46 publications

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“…Figure 3 illustrates the dependence of the LIF signal intensity (the peak value of the ToF signal) on the laser frequency with the 38 MHz sideband modulation. For the pump laser, the fit tells us that the lock point should be +270 MHz, corresponding to 11630.0848 cm −1 (identical to the value resolved from the in-cell spectroscopy [32]); while for the repump laser, the best point is +30 MHz, corresponding to 11164.3414 cm −1 . The clean-up laser and probe laser in Fig.1 are also locked at these two frequency points respectively [31].…”

Section: Resultsmentioning

confidence: 67%

“…We demonstrate the cycling scheme based on the buffer-gas cooled molecular beam of BaF produced with the laser ablation. Different from our previous study of the cold collisions between BaF and He [32], the He buffer gas here flows into the cell at a rate of 2 sccm (standard cubic centimeters per minute). The effectively thermalized (∼ 4K) mixture of He and BaF forms a beam via a 3 mm exit aperture of the cell.…”

Section: Introductionmentioning

confidence: 99%

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Radiative deflection of a BaF molecular beam via optical cycling

Chen

Yan

2017

Phys. Rev. A

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We demonstrate a quasi optical cycling for the X(v = 0) → A(v = 0) transition and a radiative force induced deflection on the buffer-gas cooled BaF molecular beam. The laser induced fluorescence enhancement with additional sidebands and a polarization modulation scheme indicates that the hyperfine states and the Zeeman sublevels are closed. The quasi optical cycling by repumping the X(v = 1) → A(v = 0) leads to a ∼ 0.8 mm deflection of the beam via scattering ∼ 150 photons per molecule, in good agreement with the predictions from our multi-level rate equation model. Further improvement by closing the leakage X(v = 2) and ∆ state allows scattering thousands of photons, and laser cooling and slowing of BaF. arXiv:1709.07602v1 [physics.atom-ph]

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Radiative deflection of a BaF molecular beam via optical cycling

Chen

Yan

2017

Phys. Rev. A

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“…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%

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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“…CH 3 F [11] and H 2 CO [12] are also cooled by optoelectric Sisyphus cooling. In addition, some other ongoing candidates, such as YbF [13], BaF [14][15][16], and BaH [17], have attracted great interest as well. With Doppler cooling, the temperature of the laser-cooled molecules is usually much higher than the Doppler limit ( / G  k 2 B ) [18] due to its complex internal level structures [4,7,19], and the temperature can approach the Doppler limit as the laser intensity is reduced [6].…”

Section: Introductionmentioning

confidence: 99%

A new route for laser cooling and trapping of cold molecules: Intensity-gradient cooling of MgF molecules using localized hollow beams

et al. 2020

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We propose a promising scheme to prepare ultracold MgF molecules from a slowed cold molecular beam by using three-dimensional pure intensity-gradient induced Sisyphus cooling. The cooling is based on a blue-detuned localized hollow beam and a weak repumping beam. We investigate the dynamic process in the trap with the method of the Monte-Carlo simulations, verifying the feasibility. Our results show that achieving sub-Doppler temperature should be possible in such a well-designed trap; the trapped MgF molecules with initial temperature of 1 mK can be directly cooled to the final equilibrium temperature of about m 46.5 K, well below the Doppler limit (about m 527.9 K for MgF); meanwhile, molecules with initial temperature of 14 mK can be even cooled to about m 68.7 K. + -) cooling [22,23], is totally different in type-II systems, because of the existence of the dark states. There are two main cooling mechanisms in such transitions, the gray molasses and the magnetically-assisted Sisyphus cooling, both of which are able to cool particles to below the Doppler limit [24,25]. On this basis, Truppe et al realized for the first time the cooling of molecules, well below the Doppler limit, using a three-dimensional blue-detuned molasses [26]. temperature was achieved by Λ-enhanced gray molasses and deep cooling with a single laser, both of which can cool CaF to several mK [27,28]. Besides, laser cooling and deceleration of molecules with stimulated force has also progressed a lot both theoretically and experimentally [29][30][31].As the common cooling method before molecules loaded into a type-II MOT, laser sweep slowing or whitelight slowing, both of which are used to compensate Doppler shift, are not a very efficient way for larger number of molecules. This causes the problem of the small number and the low density of trapped molecules in the type-II MOT. In order to produce a diverse set of dense, ultracold diatomic molecular species, it would be interesting and worthwhile to explore how to produce much larger numbers of trapped molecules. Here we propose a new scheme for the preparation of ultracold molecules, which consists of the Stark-decelerated molecules and a localized hollow optical trap, where sub-Doppler cooling works well. We bypass the Doppler cooling, and achieve the process from supersonic molecular beam to sub-Doppler cooling of molecules. The localized hollow optical trap has a strong cooling capacity, and it can derive ultracold trapped molecules with higher density.The cooling mechanism of a hollow optical trap is pure intensity-gradient cooling [32][33][34][35][36][37], another sub-Doppler cooling, which can also efficiently cool the molecules to the temperature of several photon recoils. The magnetic-field-assisted intensity-gradient cooling of molecules has first been observed in a one-dimensional standing wave, which have substantially reduced the transverse temperature of a SrF molecular beam [4]. Magnesium monofluoride (MgF) [38,39], due to its highly diagonal Franck-Condon factors (FCFs) and st...

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Cold collision and high-resolution spectroscopy of buffer-gas-cooled BaF molecules

Cited by 30 publications

References 46 publications

Radiative deflection of a BaF molecular beam via optical cycling

Radiative deflection of a BaF molecular beam via optical cycling

Doppler cooling of buffer-gas-cooled Barium monofluoride molecules

A new route for laser cooling and trapping of cold molecules: Intensity-gradient cooling of MgF molecules using localized hollow beams

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