Patents by Inventor Michael Foertsch
Michael Foertsch 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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Publication number: 20240133979Abstract: A magnetic field gradiometer for determining a magnetic field gradient includes at least one excitation light source for emitting excitation light, and two spatially spaced-apart measuring areas for magnetic field measurement. Color centers in diamond are arranged in the two measuring areas. The color centers emit fluorescent light upon excitation using the excitation light. The magnetic field gradiometer further includes at least one microwave emitter for applying at least one microwave field to the spatially spaced-apart measuring areas, two detectors for detecting the fluorescent light from the two spatially spaced-apart measuring areas, and an evaluator for determining the magnetic field gradient based on the fluorescent light detected by the two detectors. The two measuring areas are configured as freestanding measuring waveguides of a common diamond crystal. The diamond crystal is used as a substrate for the measuring waveguides.Type: ApplicationFiled: December 29, 2023Publication date: April 25, 2024Inventors: Robert Roelver, Stefan Hengesbach, Michael Foertsch
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Publication number: 20240085307Abstract: A sensor arrangement for detecting features of particles includes an emitter for emitting electromagnetic radiation, a detector for receiving the electromagnetic radiation emitted from the emitter and for providing detector signals based on the received electromagnetic radiation, and a measurement volume irradiable by the electromagnetic radiation emitted by the emitter. The measurement volume is configured for receiving particles flowing therethrough. The sensor arrangement further includes a digitizing unit for digitizing the detector signals, and an evaluation unit for evaluating the detector signals. The evaluation unit stores a trained algorithm for machine learning. The algorithm is configured for determining at least one feature of the particles based on the detector signals.Type: ApplicationFiled: November 14, 2023Publication date: March 14, 2024Inventors: Helge Hattermann, Stefan Hengesbach, Michael Foertsch
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Publication number: 20230324276Abstract: A method for calibrating a particle sensor includes focusing a laser beam on a calibration plane for generating a calibration intensity distribution in the calibration plane. A calibration plate is arranged in the calibration plane. Contrast regions for modulating an intensity of the laser beam are formed on the calibration plate. The method further includes moving the calibration plate and/or the calibration intensity distribution in the calibration plane, recording at least one intensity signal of the laser beam, following passage through the calibration plane, and calibrating the particle sensor by evaluating the at least one intensity signal.Type: ApplicationFiled: June 15, 2023Publication date: October 12, 2023Inventors: Michael Foertsch, Stefan Hengesbach, Jens Grimmel, Helge Hattermann
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Publication number: 20230202920Abstract: A method for joining an optical crystal to a substrate includes radiating a pulsed laser beam through the optical crystal or through the substrate onto a surface of an intermediate layer between the optical crystal and the substrate, and forming a fusion zone in the intermediate layer between the optical crystal and the substrate by the radiation of the pulsed laser beam, thereby integrally joining the optical crystal and the substrate.Type: ApplicationFiled: March 3, 2023Publication date: June 29, 2023Inventors: Felix ZIMMERMANN, Michael FOERTSCH, Stefan HENGESBACH, Eugen ERMANTRAUT
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Publication number: 20230002932Abstract: A method for forming at least one freestanding microstructure on a diamond crystal includes the step of removing material from the diamond crystal so as to form a structured surface, wherein the removing of the material includes creating at least two trenches, each trench having a bottom and two side walls and wherein adjacent side walls of the at least two trenches form side walls of the structured surface. The method also includes the steps of depositing at least one masking layer on the structured surface, removing at least a portion of the at least one masking layer from the bottom of each of the at least two trenches, removing additional material from the diamond crystal at least along the side walls so as to deepen the trenches, and undercutting the diamond crystal so as to form the freestanding microstructure.Type: ApplicationFiled: July 1, 2022Publication date: January 5, 2023Inventors: Robert Roelver, Michael Foertsch, Stefan Hengesbach
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Patent number: 11442335Abstract: A laser light source for producing incoherent laser beams, in particular for speckle-free imaging and/or projection, with at least two different wavelengths, preferably with three different wavelengths, includes: at least two optical devices, in particular at least two optical parametric oscillators, which each have a nonlinear optical medium for respectively producing a signal beam and an idler beam, and a superposition device configured to respectively superpose either the signal beam or the idler beam of each of the at least two optical devices for producing an incoherent laser beam with the at least two different wavelengths. A laser projector for producing an image, in particular a speckle-free image, on a projection surface, can include such a laser light source.Type: GrantFiled: April 23, 2020Date of Patent: September 13, 2022Assignee: Q.ant GmbHInventors: Klaus Mantel, Michael Foertsch
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Publication number: 20220212284Abstract: A method for producing at least one optically usable microstructure, in particular at least one waveguide structure, on an optical crystal is provided. The method includes irradiating a pulsed laser beam onto a surface of the optical crystal, moving the pulsed laser beam and the optical crystal relative to one another along a feed direction in order to remove material of the optical crystal along at least one ablation path in order to form the optically usable microstructure. The pulsed laser beam is irradiated onto the surface of the optical crystal with pulse durations of less than 5 ps, preferably less than 850 fs, more preferably less than 500 fs, in particular less than 300 fs, and with a wavelength of less than 570 nm, preferably less than 380 nm.Type: ApplicationFiled: March 25, 2022Publication date: July 7, 2022Inventors: Michael Foertsch, Stefan Hengesbach, Louise Hoppe, Roman Priester, Marc Sailer, Marcel Schaefer
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Patent number: 11371928Abstract: A sensor arrangement characterizes particles. The arrangement has an emitter with a laser source that generates a laser beam; a mode converter that generates a field distribution of the laser beam, which at each position has a different combination of a local intensity and a local polarization direction of the laser beam; and focusing optics that focus the field distribution of the laser beam onto at least one measurement region, through which the particles pass, in a focal plane. A receiver is also provided with analyzer optics configured to determine polarization-dependent intensity signals of the field distribution of the laser beam in the at least one measurement region; and an evaluator configured to characterize the particles, including the particle position, the particle velocity, the particle acceleration, or the particle size, using the polarization-dependent intensity signals.Type: GrantFiled: December 17, 2021Date of Patent: June 28, 2022Assignee: Q.ANT GMBHInventors: Michael Foertsch, Stefan Hengesbach
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Publication number: 20220113240Abstract: A sensor arrangement characterizes particles. The arrangement has an emitter with a laser source that generates a laser beam; a mode converter that generates a field distribution of the laser beam, which at each position has a different combination of a local intensity and a local polarization direction of the laser beam; and focusing optics that focus the field distribution of the laser beam onto at least one measurement region, through which the particles pass, in a focal plane. A receiver is also provided with analyzer optics configured to determine polarization-dependent intensity signals of the field distribution of the laser beam in the at least one measurement region; and an evaluator configured to characterize the particles, including the particle position, the particle velocity, the particle acceleration, or the particle size, using the polarization-dependent intensity signals.Type: ApplicationFiled: December 17, 2021Publication date: April 14, 2022Inventors: Michael Foertsch, Stefan Hengesbach
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Publication number: 20210159660Abstract: A laser light source includes a nonlinear optical medium and a pump laser source configured to generate a pump laser beam to form a signal beam and an idler beam in the nonlinear optical medium by parametric down conversion. The laser light source further includes a seed light source configured to generate a seed signal beam and/or a seed idler beam having a coherence length lesser than a coherence length of the pump laser beam, and a superpositioning device configured to superposition the seed signal beam and/or the seed idler beam with the pump laser beam for joint coupling into the nonlinear optical medium.Type: ApplicationFiled: January 27, 2021Publication date: May 27, 2021Inventors: Michael Foertsch, Stefan Hengesbach
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Publication number: 20200249542Abstract: A laser light source for producing incoherent laser beams, in particular for speckle-free imaging and/or projection, with at least two different wavelengths, preferably with three different wavelengths, includes: at least two optical devices, in particular at least two optical parametric oscillators, which each have a nonlinear optical medium for respectively producing a signal beam and an idler beam, and a superposition device configured to respectively superpose either the signal beam or the idler beam of each of the at least two optical devices for producing an incoherent laser beam with the at least two different wavelengths. A laser projector for producing an image, in particular a speckle-free image, on a projection surface, can include such a laser light source.Type: ApplicationFiled: April 23, 2020Publication date: August 6, 2020Inventors: Klaus Mantel, Michael Foertsch
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Patent number: 7535074Abstract: The invention relates to a monolithically integrated vertical pin photodiode which is produced according to BiCMOS technology and comprises a planar surface facing the light and a rear face and anode connections located across p areas on a top face of the photodiode. An i-zone of the pin photodiode is formed by combining a low doped first p-epitaxial layer, which has maximum thickness and doping concentration, placed upon a particularly high doped p substrate, with a low doped second n? epitaxial layer that borders the first layer, and n+ cathode of the pin photodiode being integrated into the second layer. The p areas delimit the second n epitaxial layer in a latent direction while another anode connecting area of the pin diode is provided on the rear face in addition to the anode connection.Type: GrantFiled: November 12, 2003Date of Patent: May 19, 2009Assignee: X-Fab Semiconductor Foundries AGInventors: Wolfgang Einbrodt, Horst Zimmermann, Michael Foertsch
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Patent number: 7282689Abstract: The invention relates to an optical fiber receiver (11) for optoelectronic integrated circuits (OEIC's) having an improved sensitivity and improved bandwidth. The improvements are achieved by subdividing the photodiodes into partial photodiodes (D1, D2), whereby each partial photodiode is connected to a respective transimpedance amplifier (20, 21), and the output signals of the individual transimpedance amplifiers are added inside a summation amplifier (30). The optical fiber received can be produced using different technologies: CMOS, BICMOS, BIPOLAR.Type: GrantFiled: March 24, 2003Date of Patent: October 16, 2007Assignee: Melexis GmbHInventors: Horst Zimmerman, Michael Foertsch, Holger Pless
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Publication number: 20070018268Abstract: The invention relates to a monolithically integrated vertical pin photodiode which is produced according to BiCMOS technology and comprises a planar surface facing the light and a rear face and anode connections located across p areas on a top face of the photodiode. An i-zone of the pin photodiode is formed by combining a low doped first p-epitaxial layer, which has maximum thickness and doping concentration, placed upon a particularly high doped p substrate, with a low doped second n? epitaxial layer that borders the first layer, and n+ cathode of the pin photodiode being integrated into the second layer. The p areas delimit the second n epitaxial layer in a latent direction while another anode connecting area of the pin diode is provided on the rear face in addition to the anode connection.Type: ApplicationFiled: November 12, 2003Publication date: January 25, 2007Applicant: X-Fab Semiconductor Foundries AGInventors: Wolfgang Einbrodt, Horst Zimmerman, Michael Foertsch
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Publication number: 20060163452Abstract: The invention relates to an optical fiber receiver (11) for optoelectronic integrated circuits (OEIC's) having an improved sensitivity and improved bandwidth. The improvements are achieved by subdividing the photodiodes into partial photodiodes (D1, D2), whereby each partial photodiode is connected to a respective transimpedance amplifier (20, 21), and the output signals of the individual transimpedance amplifiers are added inside a summation amplifier (30). The optical fiber received can be produced using different technologies: CMOS, BICMOS, BIPOLAR.Type: ApplicationFiled: March 24, 2003Publication date: July 27, 2006Applicant: Melexis GmbHInventors: Horst Zimmermann, Michael Foertsch, Holger Pless