公开(公告)号：US20230076629A1

公开(公告)日：2023-03-09

申请号：US17576897

申请日：2022-01-14

Applicant: HRL Laboratories, LLC

Inventor： Travis AUTRY ,  Ian COUNTS ,  Jennifer ELLIS ,  Danny KIM ,  Christopher ROPER

IPC: G21K1/02

Abstract: 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.

公开(公告)号：US20240399457A1

公开(公告)日：2024-12-05

申请号：US18799082

申请日：2024-08-09

Applicant: HRL Laboratories, LLC

Inventor： John H. MARTIN ,  Brennan YAHATA ,  Darby LAPLANT ,  Christopher ROPER

IPC: B22F10/20 ,  B28B1/00 ,  B29C64/141 ,  B33Y10/00 ,  B33Y80/00

Abstract: Some variations provide an additively manufactured article comprising a first region and a second region, wherein the first region is a solid region or a porous region, wherein the second region has a pore size larger than the first-region pore size, and wherein the first-region average permeability is lower than the second-region average permeability. Some variations provide a co-sintering method of making an architected material with regions having different permeabilities, in which different additive-manufacturing process parameters are applied to distinct regions of the structure. Other variations provide a wall-pinning method of making an architected material with regions having different permeabilities, in which additive-manufacturing process parameters are selected to sinter pinned feedstock powder between solid walls. Engineered structures with controlled permeability, integrated manifolds, and arbitrary geometries are disclosed, without the requirement of complex manufacturing. Many uses are described for the disclosed additively manufactured articles.

公开(公告)号：US20230215593A1

公开(公告)日：2023-07-06

申请号：US18120787

申请日：2023-03-13

Applicant: HRL Laboratories, LLC

Inventor： Travis AUTRY ,  Ian COUNTS ,  Jennifer ELLIS ,  Danny KIM ,  Christopher ROPER

IPC: G21K1/00 ,  H03L7/26 ,  G21K1/02

CPC classification number: G21K1/006 ,  H03L7/26 ,  G21K1/02 ,  G04F5/14

Abstract: 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.