A simple imaging solution for chip-scale laser cooling

Bregazzi, A. and Griffin, P. F. and Arnold, A. S. and Burt, D. P. and Martinez, G and Boudot, R. and Kitching, J. and Riis, E. and McGilligan, J. P. (2021) A simple imaging solution for chip-scale laser cooling. Applied Physics Letters, 119 (18). p. 184002. 184002. ISSN 0003-6951 (https://doi.org/10.1063/5.0068725)

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We demonstrate a simple stacked scheme that enables absorption imaging through a hole in the surface of a grating magneto-optical trap (GMOT) chip, placed immediately below a micro-fabricated vacuum cell. The imaging scheme is capable of overcoming the reduced optical access and surface scatter that is associated with this chip-scale platform while further permitting both trapping and imaging of the atoms from a single incident laser beam. The through-hole imaging is used to characterize the impact of the reduced optical overlap volume of the GMOT in the chip-scale cell, with an outlook to an optimized atom number in low volume systems.