Optimal binary gratings for multi-wavelength magneto-optical traps
Posted on 2023-11-20 - 03:02
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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Burrow, Oliver; Fasano, Robert; Brand, Wesley; Wright, Michael; li, Wenbo; Ludlow, Andrew; et al. (2023). Optimal binary gratings for multi-wavelength magneto-optical traps. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6927280
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