Stimulated Laser Cooling Using Microfabrication
| Autor: | Li, Chao, Chai, Xiao, Zhuo, Linzhao, Wei, Bochao, Lotfi, Ardalan, Ayazi, Farrokh, Raman, Chandra |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 20, 034042 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.20.034042 |
| Popis: | We have achieved stimulated laser cooling of thermal rubidium atomic beams on a silicon chip. Following pre-collimation via a silicon microchannel array, we perform beam brightening via a blue-detuned optical molasses. Owing to the small size of the chip elements, we require only 8 mW, or nine times lower power than earlier free-space experiments on cesium [Aspect et al., Phys. Rev. Lett. 57, 1688 (1986)]. Silicon micromirrors are fabricated and hand-assembled to precisely overlap a strong elliptical standing wave with a sheet-shaped atomic density distribution, with dimensions chosen precisely to match these. We reduce the transverse velocity spread to below 1 m/s within a total travel distance of 4.5 mm on a silicon substrate. We use Doppler-sensitive two-photon Raman spectroscopy to characterize the cooling. In contrast to time-of-flight methods utilized previously, this approach requires a much shorter apparatus to achieve similar resolution. This hybrid of passive and active collimation paves the way toward the construction of full-fledged atomic instruments, such as atomic beam clocks and gyroscopes, entirely on-chip through batch-fabricated processes. Comment: 10 pages, 5 figures |
| Databáze: | arXiv |
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