Laser cooling in a chip-scale platform

McGilligan, J. P. and Moore, K. R. and Dellis, A. and Martinez, G. D. and de Clercq, E. and Griffin, P. F. and Arnold, A. S. and Riis, E. and Boudot, R. and Kitching, J. (2020) Laser cooling in a chip-scale platform. Applied Physics Letters, 117 (5). 054001. ISSN 0003-6951 (

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Chip-scale atomic devices built around micro-fabricated alkali vapor cells are at the forefront of compact metrology and atomic sensors. We demonstrate a micro-fabricated vapor cell that is actively pumped to ultra-high-vacuum (UHV) to achieve laser cooling. A grating magneto-optical trap (GMOT) is incorporated with a 4 mm-thick Si/glass vacuum cell to demonstrate the feasibility of a fully miniaturized laser cooling platform. A two-step optical excitation process in rubidium is used to overcome surface-scatter limitations to the GMOT imaging. The unambiguous miniaturization and form-customizability made available with micro-fabricated UHV cells provide a promising platform for future compact cold-atom sensors.