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公开(公告)号：US20200264289A1
公开(公告)日：2020-08-20
申请号：US16784401
申请日：2020-02-07
Inventor： Jungwon KIM , Yongjin NA
IPC: G01S7/4865 , G01S7/484 , G01S17/88
Abstract: A sensing system is provided. The sensing system includes an electrical pulse generator that receives first optical pulses output from a pulsed laser, through a first path, and photo-electrically converts the first optical pulses to generate an electrical pulses; and an optical phase detector that receives second optical pulses output from the pulsed laser, through a second path, and outputs an electrical signal that corresponds to a phase error between the electrical pulses and the second optical pulses based on electro-optic sampling.
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Patent Agency Ranking
公开(公告)号：US20210013692A1
公开(公告)日：2021-01-14
申请号：US17036207
申请日：2020-09-29
Inventor： Jungwon KIM , Dohyeon Kwon
Abstract: A frequency stabilizer includes: a delay line interferometer that receives an optical signal corresponding to one frequency mode of a pulsed laser, divides and transmits the received optical signal to a reference arm and a delay arm including an optical fiber delay line, and then outputs an interference signal between signals passing through the reference arm and the delay arm; a photoelectric converter that converts the interference signal into an electrical signal; a mixer that generates a baseband signal of the electrical signal by mixing a carrier frequency signal; and a feedback controller that transmits a control signal generated based on the baseband signal to the pulsed laser. The optical signal passing through the delay arm is weighted with a delay time caused by the optical fiber delay line compared to the optical signal passing through the reference arm, and the optical signal passing through the delay arm is frequency shifted to a carrier frequency of an oscillator. A carrier-envelope offset frequency of the pulsed laser is stabilized by an offset frequency stabilizer.
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3.发明申请公开(公告)号：US20200091673A1
公开(公告)日：2020-03-19
申请号：US16572636
申请日：2019-09-17
Inventor： Jungwon KIM , Dohyeon Kwon
Abstract: A frequency stabilizer includes: a delay line interferometer that receives an optical signal corresponding to one frequency mode of a pulsed laser, divides and transmits the received optical signal to a reference arm and a delay arm including an optical fiber delay line, and then outputs an interference signal between signals passing through the reference arm and the delay arm; a photoelectric converter that converts the interference signal into an electrical signal; a mixer that generates a baseband signal of the electrical signal by mixing a carrier frequency signal; and a feedback controller that transmits a control signal generated based on the baseband signal to the pulsed laser. The optical signal passing through the delay arm is weighted with a delay time caused by the optical fiber delay line compared to the optical signal passing through the reference arm, and the optical signal passing through the delay arm is frequency shifted to a carrier frequency of an oscillator. A carrier-envelope offset frequency of the pulsed laser is stabilized by an offset frequency stabilizer.
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4.发明申请公开(公告)号：US20200266913A1
公开(公告)日：2020-08-20
申请号：US16784369
申请日：2020-02-07
Inventor： Jungwon KIM , Chan-Gi Jeon , Yongjin Na , Dohyeon Kwon
IPC: H04J14/02 , H04B10/50 , G01J9/02 , H04B10/508
Abstract: A multi-channel sensing system is disclosed. The multi-channel sensing system includes a multi-channel sensor connector that wavelength-divides an optical pulse output from a pulsed laser into a plurality of channels in a spectrum domain, transmits each of a plurality of optical sub-pulses generated from the wavelength division to a channel path allocated for each channel in multi-channel paths, multiplexes the plurality of optical sub-pulses passed through the multi-channel paths and outputs an optical signal including the multiplexed optical sub-pulses; and a multi-channel optical phase detector that receives the optical signal output from the multi-channel connector and a reference signal which is synchronized to the pulse laser, and detects a channel-specific electrical signal that corresponds to a timing error between each of the plurality of optical sub-pulses included in the optical signal and the reference signal. At lease one of sensors is connected to at least one of the multi-channel paths.
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5.发明公开公开(公告)号：US20240063604A1
公开(公告)日：2024-02-22
申请号：US18232927
申请日：2023-08-11
Inventor： Jungwon KIM , Igju Jeon , Changmin Ahn
IPC: H01S5/0687 , H01S5/183 , G01J1/02 , G01J1/04
CPC classification number: H01S5/0687 , H01S5/18355 , G01J1/0228 , G01J1/0238 , G01J1/0425
Abstract: Provided is a laser stabilization apparatus including an optical fiber resonator that is in the form of an optical fiber loop with an optical fiber delay-line, and is designed to resonate at a stabilized frequency of a laser, wherein when light emitted from the laser is input to the optical fiber resonator, a transmittance thereof changes according to a frequency of the input light, and a light measurer configured to measure light output from the optical fiber resonator and generate an error signal for stabilizing a frequency of the laser.
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公开(公告)号：US20210377511A1
公开(公告)日：2021-12-02
申请号：US17333153
申请日：2021-05-28
Inventor： Jungwon KIM , Yongjin NA , Hyunsoo KWAK , Changmin AHN
IPC: H04N13/257 , G01S7/4861 , G01S17/894
Abstract: An ultrafast camera system includes a sensor head that injects an optical pulse train input from a pulsed laser onto a surface of a measurement target and outputs an optical signal reflected from the surface, and a timing detector that receives the optical signal whose time-of-flight is changed after passing through the sensor head and outputs an electrical signal corresponding to a timing error between the optical signal and a reference signal. Another ultrafast camera system includes a wavelength dispersion device to disperse an optical pulse train of a pulsed laser into a wavelength spectrum, a lens that vertically injects continuous wavelength signals dispersed into the wavelength spectrum onto a measurement line, and a timing detector that receives an optical signal including the continuous wavelength signals reflected from the measurement line, and outputs a timing error between the reference signal and the continuous wavelength signals as a signal intensity.
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