Abstract: A laser processing head transmits a laser beam to a process zone. An input lens fixedly mounted in the head images the beam from an input with a first (negative) focal length along an optical axis. An intermediate lens is movably mounted in the head in connection with an actuator, which can move the intermediate lens along the axis at a variable lens distance relative to the input lens. The intermediate lens images the beam with a second (positive) focal length. An output lens fixedly mounted in the head images the beam with a third (positive) focal length along the axis to a focal point. The third focal length is greater than the second focal length and provides a large working distance. The focal point can be varied at a variable focal distance along the axis in relation to the variable lens distance by which the intermediate lens is moved.

Abstract: A cathode heater assembly for use in a vacuum electronic device comprises a refractive cup having a bottom portion and side walls forming a container; a cathode secured in the container of the refractive cup; and a heater wire coupled to the refractive cup. The cathode heater assembly may be manufactured by providing a refractive cup having a bottom portion and side walls forming a container; inserting a cathode pellet in the container of the refractive cup; impregnating the cathode pellet with electron emissive materials while the cathode pellet is in the container of the refractive cup; and attaching a heater wire to the refractive cup.

Abstract: The disclosure relates to a system and method for monitoring a high power laser beam in a laser material processing optical system, and provides a device and method for monitoring a high power laser beam. According to the present disclosure a detailed determination of properties of a high-power laser beam takes place in the direction of an optical fiber or laser beam entering a laser processing head connected to the laser source and these measurements can be performed during the processing operation. The device according to the present disclosure has optical sensors for measuring the intensity and respective current laser power.

Abstract: In one embodiment, a method for secured communication between a medical sensor and a computing device includes receiving, by the medical sensor, an authentication request from the computing device. The method includes generating, based on values provided in the authentication request, a challenge-response message for the computing device. The method includes receiving, from the computing device, a responsive challenge-response message. The method includes verifying that the responsive challenge-response message includes an expected value and corresponds to an expected format. The method includes, in response to verifying the responsive challenge-response message, sending a sensor secret value to the computing device.

Abstract: A high-power laser processing head has precisely centered stationary lenses. The assembly of the lenses in the head can reduce contamination. The lens is affixed (soldered) in a ring-shaped highly precise mount, which ensures a high thermal conductivity of the joining interface. The mount and lens can be cleaned as a unit and inserted in a precisely manufactured receptacle of a housing module. A seal can provide sealing between an inner surface in the receptacles and a base surfaces of the mount. The modules has a groove around the diameter of the receptacle to catch any particles generated when inserting the lens mounts into the receptacle. The assembly is clamped into place by the next housing module. The lens is directly cooled by the module's body to mitigate contamination on the lens surface. During repairs, both lens and mount can be exchanged as a unit.

Abstract: A power module comprises a high frequency switching electronic power conditioner including stacked rectifier/filters, the stacked rectifier/filters generating stacked DC output voltages; and a vacuum electronic device coupled to the high frequency switching electronic power conditioner, the vacuum electronic device including components, each component receiving a respective DC output voltage of the stacked DC output voltages.

Abstract: A radio-frequency (RF) window comprises a first flange assembly including a first flange having a first flange thickness between a first surface and a second surface, and a first waveguide channel; and a first window element having a first window thickness and disposed in the first waveguide channel at a first location; and a second flange assembly stacked against the first flange assembly, the second flange assembly including a second flange having a second flange thickness between a third surface and a fourth surface, and a second waveguide channel; and a second window element having a second window thickness and disposed in the second waveguide channel at a second location, such that when the first flange assembly is stacked against the second flange assembly the second window element has a predetermined distance to the first window element, the predetermined distance selected based on a desired frequency band of operations.

Abstract: A method of manufacturing a radio frequency (RF) or electron beam structure, comprises forming each layer of multiple layers to be assembled and bonded together with positional alignment, the forming each layer including forming a first via segment of a first particular shape and dimension in the layer at a first location in the layer, such that when the first via segments of the multiple layers are assembled with positional alignment the multiple first via segments align to form a first via; and inserting a first analogous pin into the first via, the first analogous pin being formed based on the first particular shape and dimension of each of the first via segments, such that inserting the first analogous pin into the first via assists in causing the multiple layers to be assembled with positional alignment.

Abstract: A power module comprises a high frequency switching electronic power conditioner including stacked rectifier/filters, the stacked rectifier/filters generating stacked DC output voltages; and a vacuum electronic device coupled to the high frequency switching electronic power conditioner, the vacuum electronic device including components, each component receiving a respective DC output voltage of the stacked DC output voltages.

Abstract: A depressed collector, comprises an insulator body; a plurality of serial electrodes, each serial electrode having a serial electrode receptor portion inside the insulator body and having a serial electrode thermal fin portion passing through and extending outside the insulator body; and a terminal electrode having a terminal electrode receptor portion inside the insulator body and having a terminal electrode thermal fin portion passing through and extending outside the insulator body.

Abstract: In one embodiment, a method for secured communication between a medical sensor and a computing device includes receiving, by the medical sensor, an authentication request from the computing device. The method includes generating, based on values provided in the authentication request, a challenge-response message for the computing device. The method includes receiving, from the computing device, a responsive challenge-response message. The method includes verifying that the responsive challenge-response message includes an expected value and corresponds to an expected format. The method includes, in response to verifying the responsive challenge-response message, sending a sensor secret value to the computing device.

Abstract: A cathode heater assembly for use in a vacuum electronic device includes a refractive cup having a bottom portion and side walls forming a container; a cathode secured in the container of the refractive cup; and a heater wire coupled to the refractive cup. The cathode heater assembly may be manufactured by providing a refractive cup having a bottom portion and side walls forming a container; inserting a cathode pellet in the container of the refractive cup; impregnating the cathode pellet with electron emissive materials while the cathode pellet is in the container of the refractive cup; and attaching a heater wire to the refractive cup.

Abstract: A sensing apparatus monitors a cover optic on a laser processing head for contamination, indicating the need to replace the cover optic. The apparatus includes at least one reflector and at least one sensors that are disposed in the processing head adjacent a periphery of the cover optic. The reflector reflects radiation from the laser beam deflected from contamination on the cover optic and incident thereagainst. The sensor is offset from the reflector and detects at least a portion of the radiation reflected by the reflector. A controller in communication with the sensor can determine the contamination on the cover optic based on the detected radiation.

Abstract: A cathode heater assembly for use in a vacuum electronic device comprises a refractive cup having a bottom portion and side walls forming a container; a cathode secured in the container of the refractive cup; and a heater wire coupled to the refractive cup. The cathode heater assembly may be manufactured by providing a refractive cup having a bottom portion and side walls forming a container; inserting a cathode pellet in the container of the refractive cup; impregnating the cathode pellet with electron emissive materials while the cathode pellet is in the container of the refractive cup; and attaching a heater wire to the refractive cup.

Abstract: A laser processing head conducts laser energy to process a workpiece. A fiber input emits the laser energy, and internal optics focus the laser energy as a laser beam to a focus spot relative to an output on the head. A relay between the fiber input and the internal optics directs a portion of process light, which has returned from the process through the internal optics to the relay. The effects of the internal optics form the returned process light as a hollow converging cone toward the fiber input. The relay is located in an angular space situated an extent outside the diverging cone of the emitted laser energy from the fiber input, such as at a numerical aperture that is about 10 percent greater than the numerical aperture of the fiber input. A sensor detects the portion of the process light directed to it.

Abstract: The disclosure relates to a system and a method for monitoring the state of optical elements of a device for laser material processing. According to the present disclosure a detailed monitoring of the state of optical elements of a device for laser material processing takes place by monitoring properties of laser radiation in the direction of an optical fiber or laser radiation entering a laser processing head connected to the laser source and these measurements, which can be performed during the processing process. The device according to the present disclosure has optical sensors for measuring the intensity and respective current laser power.

Abstract: An audio device having a housing including a first loudspeaker disposed in the housing and oriented to emit sound towards a top of the housing, a second loudspeaker disposed in the housing and oriented to emit sound towards a bottom of the housing, and a third loudspeaker disposed in the housing and oriented to emit sound radially outward from the housing of the audio device. Embodiments may include a microphone array disposed proximate the top of the audio device and encircling the first loudspeaker.

Abstract: Embodiments described herein include a data receiving device for an analyte monitoring system. The data receiving device detects a disconnect between the data receiving device and a sensor control device of the analyte monitoring system. The data receiving device sets a duration of a scan window for receiving connection data packets from the sensor control device to a current length and initiates the scan window. In response to determining that a connection between the data receiving device and sensor control device has not been established based on connection data packets received during the scan window, the data receiving device performs iterations of a process to adjust the scan window, involving increasing a duration of the scan window to a new length that is greater than the current length and initiating the scan window based on the duration of the scan window at the new length.