Vapor cells having an array of cavities therein

    公开(公告)号:US11300599B1

    公开(公告)日:2022-04-12

    申请号:US17480448

    申请日:2021-09-21

    Abstract: In a general aspect, a vapor cell includes a body defined by a stack of layers bonded to each other. The stack of layers defines an array of cavities that includes first and second subsets of cavities. The first subset of cavities extends through intermediate layers of the stack of layers and the second subset of cavities extends entirely through the stack of layers. The vapor cell includes a vapor or a source of the vapor disposed in each of the first subset of cavities. The stack of layers includes a first end layer disposed at a first end of the body and a second end layer disposed at a second, opposite end of the body. The intermediate layers are positioned between the first and second end layers.

    Photonic crystal receivers
    22.
    发明授权

    公开(公告)号:US11137432B1

    公开(公告)日:2021-10-05

    申请号:US17142012

    申请日:2021-01-05

    Abstract: In a general aspect, a receiver is disclosed for sensing radio frequency (RF) electromagnetic radiation. The receiver includes a dielectric body having an array of cavities ordered periodically to define a photonic crystal structure in the dielectric body. The dielectric body also has a region in the array of cavities that defines a defect in the photonic crystal structure. An elongated slot through the region extends from a slot opening in a surface of the dielectric body at least partially through the dielectric body. The receiver also includes a vapor or a source of the vapor in the elongated slot as well as an optical window covering the elongated slot. The optical window has a window surface bonded to the surface of the dielectric body to form a seal about the slot opening.

    Measuring thermal radiation using vapor cell sensors

    公开(公告)号:US12241789B2

    公开(公告)日:2025-03-04

    申请号:US18756988

    申请日:2024-06-27

    Abstract: In a general aspect, a radiometer is disclosed that includes a vapor cell sensor. The vapor cell sensor contains a vapor and is configured to generate an optical signal in response to laser signals and thermal radiation interacting with the vapor. The vapor includes a Rydberg electronic transition that is configured to interact with the thermal radiation. The radiometer also includes a computing system having one or more processors and a memory. The memory stores instructions that, when executed by the one or more processors, are configured to perform operations that include generating, based on the optical signal, transmission data that represents the transmission of the one laser signal through the vapor. The operations also include determining, based on the transmission data, a temperature of a target body that generates the thermal radiation.

    Sensing Radio Frequency Electromagnetic Fields

    公开(公告)号:US20240393379A1

    公开(公告)日:2024-11-28

    申请号:US18650804

    申请日:2024-04-30

    Abstract: In a general aspect, a system is described for sensing radio frequency (RF) electromagnetic fields. The system includes a laser system that generates probe and coupling laser signals. The system also includes an RF source that generates a reference RF electromagnetic field. The reference RF electromagnetic field is part of a combined RF electromagnetic field that also includes a perturbing RF electromagnetic field. A vapor cell sensor of the system generates an optical signal in response to the probe laser signal, the coupling laser signal, and the combined RF electromagnetic field interacting with a vapor of the vapor cell sensor. The system additionally includes a control system that tunes the coupling laser signal and the reference RF electromagnetic field relative to respective transitions of the vapor. The control system generates, based on the optical signal, a value that represents a property of the perturbing RF electromagnetic field.

    Sensing Signals That Include Radio Frequency Pulses

    公开(公告)号:US20230204714A1

    公开(公告)日:2023-06-29

    申请号:US18068098

    申请日:2022-12-19

    CPC classification number: G01S7/285

    Abstract: In a general aspect, a radar system includes a vapor cell sensor system and a radio frequency (RF) optic. The vapor cell sensor system includes a vapor cell sensor, and the RF optic is configured to direct an RF field onto the vapor cell sensor. The RF field includes one or more RF pulses that define a radar signal. The radar system also includes a signal processing system configured to perform operations that include generating a digital signal based on a signal from the vapor cell sensor system. The digital signal represents a measured response of the vapor to the RF field over a time period. The operations also include applying a matched filter to the digital signal to generate a filtered signal and processing the filtered signal to determine properties of the RF field sensed by the vapor cell sensor over the time period.

    Generating electromagnetic radiation from a photonic crystal maser

    公开(公告)号:US11469566B1

    公开(公告)日:2022-10-11

    申请号:US17667296

    申请日:2022-02-08

    Abstract: In a general aspect, a photonic crystal maser includes a dielectric body having an array of cavities ordered periodically to define a photonic crystal structure in the dielectric body. The dielectric body also includes a region in the array of cavities defining a defect in the photonic crystal structure. An elongated slot through the region extends from a slot opening in a surface of the dielectric body at least partially through the dielectric body. The elongated slot and the array of cavities define a waveguide of the dielectric body. The dielectric body additionally includes an input coupler aligned with an end of the elongated slot and configured to couple a reference radiofrequency (RF) electromagnetic radiation to the waveguide. The photonic crystal maser also includes a vapor or source of the vapor in the elongated slot and an optical window covering the elongated slot.

    Increasing the Measurement Precision of Optical Instrumentation using Kalman-Type Filters

    公开(公告)号:US20220260428A1

    公开(公告)日:2022-08-18

    申请号:US17474946

    申请日:2021-09-14

    Abstract: In a general aspect, a method is presented for increasing the measurement precision of an optical instrument. The method includes determining, based on optical data and environmental data, a measured value of an optical property measured by the optical instrument. The optical instrument includes an optical path and a sensor configured to measure an environmental parameter. The method also includes determining a predicted value of the optical property based on a model representing time evolution of the optical instrument. The method additionally includes calculating an effective value of the optical property based on the measured value, the predicted value, and a Kalman gain. The Kalman gain is based on respective uncertainties in the measured and predicted values and defines a relative weighting of the measured and predicted values in the effective value.

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