Abstract: An atom interferometer system includes a sensor cell comprising alkali metal atoms. An optical system generates first and second interrogation beams having respective first and second frequencies and a circular polarization. The optical system includes optics that provide the first and second interrogation beams through the sensor cell in a first direction and reflect the first and second interrogation beams back through the sensor cell in a second direction opposite the first direction and in a same circular polarization to drive the alkali metal atoms from a first energy state to a greater energy state during an interrogation stage of sequential measurement cycles. A detection system detects a state distribution of a population of the alkali metal atoms between the first energy state and the second energy state during the interrogation stage based on an optical response.

Abstract: A mow strip, mow strip kit/assembly. There are front and back brackets coupled to an elongated mow strip body. The brackets, coupled to the base of a pair of adjacent fence posts, include flat protrusions extending orthogonally from a mounting plate. The elongated mow strip body has a flat side parallel to flat side of the fence posts to make a flush connection. The top of the mow strip includes a groove into which a fence rail may be disposed. A mounting structure on each face of the mow strip includes slits shaped and positioned to receive the protrusion of the brackets. The slits extend along and through an end of the bottom surface of the mow strip such that at the end of the bottom surface the elongated mow strip body may be vertically lowered directly onto one of the protrusions.

Abstract: An atom interferometer system includes a sensor cell comprising alkali metal atoms. An optical system generates first and second interrogation beams having respective first and second frequencies and a circular polarization. The optical system includes optics that provide the first and second interrogation beams through the sensor cell in a first direction and reflect the first and second interrogation beams back through the sensor cell in a second direction opposite the first direction and in a same circular polarization to drive the alkali metal atoms from a first energy state to a greater energy state during an interrogation stage of sequential measurement cycles. A detection system detects a state distribution of a population of the alkali metal atoms between the first energy state and the second energy state during the interrogation stage based on an optical response.

Abstract: Methods and apparatus that provide for inertial sensing. In one example, a method for inertial sensing includes trapping and cooling a cloud of atoms, applying a first beam splitter pulse sequence to the cloud of atoms, applying one or more augmentation pulses to the cloud of atoms subsequent to applying the first beam splitter pulse sequence, applying a mirror sequence to the cloud of atoms, applying a one or more augmentation pulses to the cloud of atoms subsequent to applying the mirror sequence, applying a second beam splitter pulse sequence to the cloud of atoms subsequent to applying the second augmentation pulse, modulating at least one of a phase and an intensity of at least one of the first and the second beam splitter pulse sequences, performing at least one measurement on the cloud of atoms, and generating a control signal based on the at least one measurement.

Abstract: Methods and apparatus that provide for inertial sensing. In one example, a method for inertial sensing includes trapping and cooling a cloud of atoms, applying a first beam splitter pulse sequence to the cloud of atoms, applying one or more augmentation pulses to the cloud of atoms subsequent to applying the first beam splitter pulse sequence, applying a mirror sequence to the cloud of atoms, applying a one or more augmentation pulses to the cloud of atoms subsequent to applying the mirror sequence, applying a second beam splitter pulse sequence to the cloud of atoms subsequent to applying the second augmentation pulse, modulating at least one of a phase and an intensity of at least one of the first and the second beam splitter pulse sequences, performing at least one measurement on the cloud of atoms, and generating a control signal based on the at least one measurement.

Abstract: Methods and apparatus provide for inertial sensing and atomic time-keeping based on atom interferometry. According to one example a method for inertial sensing includes trapping and cooling a cloud of atoms, applying a first beam splitter pulse sequence to the cloud of atoms, applying a mirror sequence to the cloud of atoms subsequent to applying the first beam splitter pulse sequence, applying a second beam splitter pulse sequence to the cloud of atoms subsequent to applying the mirror sequence, modulating at least one of a phase and an intensity of at least one of the first and the second beam splitter pulse sequences, performing at least one measurement subsequent to applying the second beam splitter pulse on the cloud of atoms during an interrogation time, and generating a control signal based on the at least one measurement.

Abstract: An implantable internal dynamic splint device that replaces or augments the function of a muscle that is antagonized at a joint by a functional muscle is described. The device comprises an elastic body, a first tissue-attaching component adapted to be attached to a bone, and a second tissue-attaching component adapted to be attached to a bone or a soft tissue. Also disclosed is a method for treating muscle function deficiency using the internal dynamic splinting device. The method comprises the steps of making an incision at a target site on a subject, attaching the first tissue-attaching component of the internal dynamic splinting device to a first bone, attaching the second tissue-attaching component of the internal dynamic splinting device to a second bone or a soft tissue, and closing the incision. A method for compensating muscle function deficiency on a side of a joint using the device is also disclosed.