Optimal binary gratings for multi-wavelength magneto-optical traps
- URL: http://arxiv.org/abs/2306.17080v3
- Date: Sat, 18 Nov 2023 22:46:19 GMT
- Title: Optimal binary gratings for multi-wavelength magneto-optical traps
- Authors: Oliver S. Burrow, Robert J. Fasano, Wesley Brand, Michael W. Wright,
Wenbo Li, Andrew D. Ludlow, Erling Riis, Paul F. Griffin, and Aidan S. Arnold
- Abstract summary: We optically characterize a wide variety of binary gratings at different wavelengths to find a simple empirical fit for grating diffraction efficiency data.
The model avoids complex 3D light-grating surface calculations, yet still yields results accurate to a few percent across a broad range of parameters.
- Score: 10.994057560886938
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Grating magneto-optical traps are an enabling quantum technology for portable
metrological devices with ultracold atoms. However, beam diffraction efficiency
and angle are affected by wavelength, creating a single-optic design challenge
for laser cooling in two stages at two distinct wavelengths - as commonly used
for loading e.g. Sr or Yb atoms into optical lattice or tweezer clocks. Here,
we optically characterize a wide variety of binary gratings at different
wavelengths to find a simple empirical fit to experimental grating diffraction
efficiency data in terms of dimensionless etch depth and period for various
duty cycles. The model avoids complex 3D light-grating surface calculations,
yet still yields results accurate to a few percent across a broad range of
parameters. Gratings optimized for two (or more) wavelengths can now be
designed in an informed manner suitable for a wide class of atomic species
enabling advanced quantum technologies.
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