Stimulated Laser Cooling Using Microfabrication

• URL: http://arxiv.org/abs/2208.12784v1
• Date: Fri, 26 Aug 2022 17:04:33 GMT
• Title: Stimulated Laser Cooling Using Microfabrication
• Authors: Chao Li, Xiao Chai, Linzhao Zhuo, Bochao Wei, Ardalan Lotfi, Farrokh Ayazi, Chandra Raman
• Abstract summary: We have achieved stimulated laser cooling of thermal rubidium atomic beams on a silicon chip. This hybrid of passive and active collimation paves the way toward the construction of full-fledged atomic instruments.
• Score: 4.188903452390429
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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