Patents by Inventor Grant Biedermann
Grant Biedermann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11971256Abstract: A guided cold-atom inertial sensor system comprises an atom trap integrated platform, a laser system, a magnetic field system, a control system, and a computing system. The laser system and magnetic field system are adapted to form a magneto-optical trap (MOT) about a suspended waveguide of the atom trap integrated platform made of membrane integrated photonics. After loading cold atoms from a MOT, the photonic atom trap integrated platform generates one-dimensional guided atoms with an evanescent field optical dipole trap (EF-ODT) along the optical waveguide to create guided atomic accelerometers/gyroscopes. Motion of atomic wavepackets in a superposition state is created along the guided atom geometry by way of state-dependent momentum kicks. The light-pulse sequence of guided atom interferometry splits, redirects, and recombines atomic wavepackets, which allows measurement of atom interference fringes sensitive to inertial forces via a probe laser.Type: GrantFiled: January 6, 2022Date of Patent: April 30, 2024Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Jongmin Lee, Grant Biedermann, Yuan-Yu Jau, Michael Gehl, Christopher Todd DeRose
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Patent number: 11914188Abstract: An atom trap integrated platform (ATIP) comprises a substrate, a membrane, and a suspended waveguide. The substrate has an opening formed therein. The membrane extends across a portion of the substrate opening. The suspended waveguide is formed on the membrane such that the suspended waveguide extends from a first edge of the substrate to a second edge. A magneto-optical trap (MOT) is formed around the suspended waveguide by emitting a plurality of cooling beams and a repump through the substrate opening. Evanescent fields are established above the suspended waveguide by coupling two trapping beams through the suspended waveguide, which trapping beams are red-detuned and blue-detuned with respect to the resonant optical transition of the atoms. By forming the MOT within the evanescent fields, an evanescent field optical trap (EFOT) is formed.Type: GrantFiled: December 9, 2021Date of Patent: February 27, 2024Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Jongmin Lee, Michael Gehl, Grant Biedermann, Yuan-Yu Jau, Christopher T. DeRose
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Patent number: 11766651Abstract: A sealed, passively pumped, polycrystalline ceramic vacuum chamber and method for fabricating the chamber are disclosed. The body of the vacuum chamber is made from a polycrystalline ceramic, for example, alumina. The vacuum chamber includes one or more windows made from a transparent ceramic, for example, sapphire, to accommodate optical access, while remaining amorphous-glass free to minimize or eliminate helium permeation. The vacuum chamber components are joined via laser welding or furnace brazing and the completed chamber is bakeable at temperatures up to 400° C. The vacuum chamber can operate at high or ultra-high vacuum pressures for an extended period through the use of one or more getter-based pumps. The vacuum chamber may include one or more atomic sources depending upon the application.Type: GrantFiled: April 6, 2020Date of Patent: September 26, 2023Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Charles A. Walker, Peter D. D. Schwindt, Grant Biedermann, Dennis J. De Smet, Jongmin Lee
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Patent number: 11545815Abstract: A compact laser source and a single sideband modulator used therein is disclosed. The compact laser source includes a seed laser and one or more channels, with each channel generating one or more output laser beams having corresponding different wavelengths. The compact laser source can be formed in whole or in part on a single optical motherboard to thereby minimize space and power requirements. By employing the disclosed single sideband modulator, harmonics in the generated output laser beams can be minimized. The compact laser source finds application in an atom interferometer (AI) system, which may be used to measure gravity, acceleration, or rotation of the AI system.Type: GrantFiled: March 26, 2020Date of Patent: January 3, 2023Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Anthony L. Lentine, Grant Biedermann, Michael Gehl, Christopher DeRose, Jongmin Lee, Kevin Michael Fortier
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Patent number: 9934469Abstract: A method for preparing an entangled quantum state of an atomic ensemble is provided. The method includes loading each atom of the atomic ensemble into a respective optical trap; placing each atom of the atomic ensemble into a same first atomic quantum state by impingement of pump radiation; approaching the atoms of the atomic ensemble to within a dipole-dipole interaction length of each other; Rydberg-dressing the atomic ensemble; during the Rydberg-dressing operation, exciting the atomic ensemble with a Raman pulse tuned to stimulate a ground-state hyperfine transition from the first atomic quantum state to a second atomic quantum state; and separating the atoms of the atomic ensemble by more than a dipole-dipole interaction length.Type: GrantFiled: December 6, 2016Date of Patent: April 3, 2018Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Yuan Yu Jau, Grant Biedermann, Ivan Deutsch
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Patent number: 9291508Abstract: An atomic interferometric device useful, e.g., for measuring acceleration or rotation is provided. The device comprises at least one vapor cell containing a Raman-active chemical species, an optical system, and at least one detector. The optical system is conformed to implement a Raman pulse interferometer in which Raman transitions are stimulated in a warm vapor of the Raman-active chemical species. The detector is conformed to detect changes in the populations of different internal states of atoms that have been irradiated by the optical system.Type: GrantFiled: March 13, 2014Date of Patent: March 22, 2016Assignee: Sandia CorporationInventors: Grant Biedermann, Hayden James Evans McGuinness, Akash Rakholia, Yuan-Yu Jau, Peter Schwindt, David R. Wheeler
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Patent number: 9086429Abstract: A light-pulse atomic interferometry (LPAI) apparatus is provided. The LPAI apparatus comprises a vessel, two sets of magnetic coils configured to magnetically confine an atomic vapor in two respective magneto-optical traps (MOTs) within the vessel when activated, and an optical system configured to irradiate the atomic vapor within the vessel with laser radiation that, when suitably tuned, can launch atoms previously confined in each of the MOTs toward the other MOT. In embodiments, the magnetic coils are configured to produce a magnetic field that is non-zero at the midpoint between the traps. In embodiments, the time-of-flight of the launched atoms from one MOT to the other is 12 ms or less. In embodiments, the MOTs are situated approximately 36 mm apart. In embodiments, the apparatus is configured to activate the magnetic coils according to a particular temporal magnetic field gradient profile.Type: GrantFiled: March 10, 2015Date of Patent: July 21, 2015Assignee: Sandia CorporationInventors: Grant Biedermann, Hayden James Evans McGuinness, Akash Rakholia
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Patent number: 8941053Abstract: An inertial sensing system includes a magneto-optical trap (MOT) that traps atoms within a specified trapping region. The system also includes a cooling laser that cools the trapped atoms so that the atoms remain within the specified region for a specified amount of time. The system further includes a light-pulse atom interferometer (LPAI) that performs an interferometric interrogation of the atoms to determine phase changes in the atoms. The system includes a controller that controls the timing of MOT and cooling laser operations, and controls the timing of interferometric operations to substantially recapture the atoms in the specified trapping region. The system includes a processor that determines the amount inertial movement of the inertial sensing system based on the determined phase changes in the atoms. Also, a method of inertial sensing using this inertial sensing system includes recapture of atoms within the MOT following interferometric interrogation by the LPAI.Type: GrantFiled: August 22, 2012Date of Patent: January 27, 2015Assignee: Sandia CorporationInventors: Grant Biedermann, Akash Vrijal Rakholia, Hayden McGuinness
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Patent number: 7859350Abstract: A microfabricated ion frequency standard (i.e. an ion clock) is disclosed with a permanently-sealed vacuum package containing a source of ytterbium (Yb) ions and an octupole ion trap. The source of Yb ions is a micro-hotplate which generates Yb atoms which are then ionized by a ultraviolet light-emitting diode or a field-emission electron source. The octupole ion trap, which confines the Yb ions, is formed from suspended electrodes on a number of stacked-up substrates. A microwave source excites a ground-state transition frequency of the Yb ions, with a frequency-doubled vertical-external-cavity laser (VECSEL) then exciting the Yb ions up to an excited state to produce fluorescent light which is used to tune the microwave source to the ground-state transition frequency, with the microwave source providing a precise frequency output for the ion clock.Type: GrantFiled: April 28, 2009Date of Patent: December 28, 2010Assignee: Sandia CorporationInventors: Peter Schwindt, Grant Biedermann, Matthew G. Blain, Daniel L. Stick, Darwin K. Serkland, Roy H. Olsson, III