| Autor: |
S Hofsäss, M Doppelbauer, S C Wright, S Kray, B G Sartakov, J Pérez-Ríos, G Meijer, S Truppe |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 23, Iss 7, p 075001 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/ac06e5 |
| Popis: |
Aluminium monofluoride (AlF) is a promising candidate for laser cooling and trapping at high densities. We show efficient production of AlF in a bright, pulsed cryogenic buffer gas beam, and demonstrate rapid optical cycling on the Q rotational lines of the A ^1 Π ↔ X ^1 Σ ^+ transition. We measure the brightness of the molecular beam to be >10 ^12 molecules per steradian per pulse in a single rotational state and present a new method to determine its velocity distribution in a single shot. The photon scattering rate of the optical cycling scheme is measured using three different methods, and is compared to theoretical predictions of the optical Bloch equations and a simplified rate equation model. Despite the large number of Zeeman sublevels (up to 216 for the Q(4) transition) involved, a high scattering rate of at least 17(2) × 10 ^6 s ^−1 can be sustained using a single, fixed-frequency laser without the need to modulate the polarisation. We deflect the molecu-lar beam using the radiation pressure force and measure an acceleration of 8.7(1.5) × 10 ^5 m s ^−2 . Losses from the optical cycle due to vibrational branching to X ^1 Σ ^+ , v ″ = 1 are addressed efficiently with a single repump laser. Further, we investigate two other loss channels, parity mixing by stray electric fields and photo-ionisation. The upper bounds for these effects are sufficiently low to allow loading into a magneto‐optical trap. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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