Abstract
We investigated the optical and magnetic properties of a transparent magnetic garnet with a particular focus on its applications to atomic physics experiments. The garnet film used in this study was a magnetically soft material that was originally designed for a Faraday rotator at optical communication wavelengths in the near infrared region. The film had a thickness of 2.1 μm and a small optical loss at a wavelength of λ=780 nm resonant with Rb atoms. The Faraday effect was also small and, thus, barely affected the polarization of light at λ=780 nm. In contrast, large Faraday rotation angles at shorter wavelengths enabled us to visualize magnetic domains, which were perpendicularly magnetized in alternate directions with a period of 3.6 μm. We confirmed the generation of an evanescent wave on the garnet film, which can be used for the optical observation and manipulation of atoms on the surface of the film. Finally, we demonstrated a magnetic mirror for laser-cooled Rb atoms using the garnet film.
Highlights
The manipulation of neutral atoms above a solid surface is important in atomic physics from both a fundamental and practical point of view
We studied a transparent magnetic garnet film that was originally designed for a commercial Faraday rotator at optical communication wavelengths, from the point of view of atomic physics
The garnet film used in this study was a thinner version of a commercial Faraday rotator (Type WRC; Adamant Co., Ltd., Tokyo, Japan).[31]
Summary
The manipulation of neutral atoms above a solid surface is important in atomic physics from both a fundamental and practical point of view. Optical and magnetic properties of a transparent garnet film for atomic physics experiments
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