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公开(公告)号：US11929186B2
公开(公告)日：2024-03-12
申请号：US18120787
申请日：2023-03-13
发明人： Travis Autry , Ian Counts , Jennifer Ellis , Danny Kim , Christopher Roper
摘要： In some variations, an interferometric frequency-reference apparatus comprises: an atom source configured to supply neutral atoms; a collimator configured to form a collimated beam of the neutral atoms; one or more probe lasers; and a Doppler laser configured to determine a ground-state population of the neutral atoms. Other variations provide a method of creating a stable frequency reference, comprising: forming a collimated beam of neutral atoms; illuminating the neutral atoms with first and second probe lasers; adjusting the frequencies of the first probe laser and second probe laser using Ramsey spectroscopy to an S→D transition of the neutral atoms; and determining a ground-state population of the neutral atoms with another laser. The interferometric frequency-reference apparatus may provide an optical frequency reference or a microwave frequency reference.
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公开(公告)号：US10545461B1
公开(公告)日：2020-01-28
申请号：US15639391
申请日：2017-06-30
发明人： Christopher S. Roper , Adam F. Gross , Matthew T. Rakher , Logan D. Sorenson , John J. Vajo , Jason A. Graetz , Russell Mott , Danny Kim
摘要： Some variations provide an alkali metal or alkaline earth metal vapor cell with a solid ionic conductor and intercalable-compound electrodes. The intercalable-compound electrodes are used as efficient sources and/or as sinks for alkali metal or alkaline earth metal atoms, thus enabling electrical control over metal atom content in the vapor cell. Some variations provide a vapor-cell system comprising: a vapor-cell region configured to allow a vapor-cell optical path into a vapor-cell vapor phase; a first electrode containing an intercalable compound capable of being intercalated by at least one element selected from Rb, Cs, Na, K, or Sr; a second electrode electrically isolated from the first electrode; and an ion-conducting layer between the first electrode and the second electrode. The ion-conducting layer is ionically conductive for at least one ionic species selected from Rb+, Cs+, Na+, K+, or Sr2+. The first intercalable compound is preferably a carbonaceous material, such as graphite.
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公开(公告)号：US11869679B2
公开(公告)日：2024-01-09
申请号：US17576897
申请日：2022-01-14
发明人： Travis Autry , Ian Counts , Jennifer Ellis , Danny Kim , Christopher Roper
摘要： In some variations, an interferometric frequency-reference apparatus comprises: an atom source configured to supply neutral atoms to be ionized; an ionizer configured to excite the neutral atoms to form ionized atoms; an ion collimator configured to form a collimated beam of the ionized atoms; probe lasers; and a Doppler laser configured to determine a ground-state population of the ionized atoms, wherein the atom source, the ionizer, and the ion collimator are disposed within a vacuum chamber. Other variations provide a method of creating a stable frequency reference, comprising: forming ionized atoms from an atomic vapor; forming a collimated beam of ionized atoms; illuminating ionized atoms with first and second probe lasers; adjusting the frequencies of the first probe and second probe lasers using Ramsey spectroscopy to an S→D transition of ionized atoms; and determining a ground-state population of the ionized atoms with another laser.
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公开(公告)号：US10775748B1
公开(公告)日：2020-09-15
申请号：US16720139
申请日：2019-12-19
发明人： Christopher S. Roper , Adam F. Gross , Matthew T. Rakher , Logan D. Sorenson , John J. Vajo , Jason A. Graetz , Russell Mott , Danny Kim
摘要： Some variations provide an alkali metal or alkaline earth metal vapor cell with a solid ionic conductor and intercalable-compound electrodes. The intercalable-compound electrodes are used as efficient sources and/or as sinks for alkali metal or alkaline earth metal atoms, thus enabling electrical control over metal atom content in the vapor cell. Some variations provide a vapor-cell system comprising: a vapor-cell region configured to allow a vapor-cell optical path into a vapor-cell vapor phase; a first electrode; a second electrode electrically isolated from the first electrode, wherein the second electrode contains an intercalable compound intercalated by an element selected from Rb, Cs, Na, K, or Sr; and an ion-conducting layer between the first electrode and the second electrode. The ion-conducting layer is ionically conductive for at least one ionic species selected from Rb+, Cs+, Na+, K+, or Sr2+. The intercalable compound is preferably a carbonaceous material, such as graphite.
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