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    METHOD FOR SERVOCONTROLLING AN OPTICAL DEVICE COMPRISING A LASER AND A CAVITY, MAKING IT POSSIBLE TO COMPENSATE FOR AN AMPLITUDE MODULATION INTRODUCED BY A PHASE MODULATOR
    5.
    发明公开
    METHOD FOR SERVOCONTROLLING AN OPTICAL DEVICE COMPRISING A LASER AND A CAVITY, MAKING IT POSSIBLE TO COMPENSATE FOR AN AMPLITUDE MODULATION INTRODUCED BY A PHASE MODULATOR 审中-公开

    公开(公告)号：US20240120699A1

    公开(公告)日：2024-04-11

    申请号：US18284422

    申请日：2022-04-01

    申请人： THALES ,  ECOLE NORMALE SUPERIEURE PARIS-SACLAY ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

    发明人： Gilles FEUGNET ,  Maxime DESCAMPEAUX ,  Fabien BRETENAKER

    IPC分类号： H01S3/00 ,  H01S3/137 ,  H01S3/139

    CPC分类号： H01S3/0085 ,  H01S3/0078 ,  H01S3/137 ,  H01S3/1392

    摘要： A method for the servo control of an optical device includes a cavity exhibiting resonance around a center frequency ƒc, a laser and a phase modulator, the method being designed to servo-control the cavity to the laser or vice versa and to compensate for an amplitude modulation introduced by the phase modulator, the method comprising, inter alia, the following steps: A. varying a difference δν between the optical frequency of the laser radiation and the center frequency, such that the optical frequency scans the resonance, the difference being controlled by a parameter of an element of the device, and for each difference δνi i. modulating, at a modulation frequency ƒmod, a phase of the laser radiation, through a modulation phase ϕmod, with the phase modulator, ii. injecting the phase-modulated radiation into the cavity, iii. using a photodiode to detect radiation reflected or transmitted by the cavity and generating an electrical signal (St, Sr) representative of the intensity of the detected radiation, iv. demodulating the electrical signal at the modulation frequency ƒmod by synchronously generating a first demodulated signal and a second demodulated signal representative of the demodulated electrical signal, respectively at a first demodulation phase ϕdem,1 and at a second modulation phase ϕdem,2ϕdem,2≈ϕdem,1k, where k∈[0; 2π] is different from the first phase, and by filtering the first and the second signal so as to retain only a DC component of the first demodulated signal Vϵ1, called error signal 1, and of the second demodulated signal Vϵ2, called error signal 2.

    METHODS AND SYSTEMS FOR PULSED BEAM PHASE LOCKING
    8.
    发明公开
    METHODS AND SYSTEMS FOR PULSED BEAM PHASE LOCKING 审中-公开

    公开(公告)号：US20230387647A1

    公开(公告)日：2023-11-30

    申请号：US17827929

    申请日：2022-05-30

    申请人： XANADU QUANTUM TECHNOLOGIES INC.

    发明人： Yanbing Zhang ,  Varun Vaidya

    IPC分类号： H01S3/102 ,  H01S3/10 ,  H01S3/00

    CPC分类号： H01S3/1024 ,  H01S3/10015 ,  H01S3/0085

    摘要： A pump source configured to generate a pulsed optical beam. The pump source generates a first light beam, a second light beam, and a third light beam, where the first, the second, and the third light beams satisfy a phase relationship. Each of the first, the second, and the third light beams are independently modulated in separate modulation paths and recombined as a pulsed optical beam. A portion of the pulsed optical beam is parametrically amplified within a nonlinear optical medium, where a resulting amplification gain is proportional to a phase difference between the first, second, and third modulated light beams. The power value of the amplified beam is measured as an indication of the phrase difference between the three beams and a corrective phase adjustment based on the error correction signal is applied on any one of the first, second, and third modulation paths to maintain the phase relationship.

    OPTICAL PULSE BURST FORMATION APPARATUS AND METHOD
    10.
    发明公开
    OPTICAL PULSE BURST FORMATION APPARATUS AND METHOD 审中-公开

    公开(公告)号：US20230170659A1

    公开(公告)日：2023-06-01

    申请号：US17921765

    申请日：2021-04-27

    申请人： NKT PHOTONICS A/S

    发明人： Michael YARROW

    IPC分类号： H01S3/00 ,  H01S3/23 ,  G02B27/10

    CPC分类号： H01S3/0057 ,  H01S3/0085 ,  H01S3/2316 ,  G02B27/106

    摘要： An optical pulse generator arranged to generate an initial sequence of optical pulses having an initial inter-pulse period; and an optical pulse burst formation apparatus including: an interleaving stage to receive an initial sequence of optical pulses having an initial inter-pulse period, including: an optical splitter to power split received optical pulses, thereby generating a first and second replica sequences of optical pulses; a first optical arm to receive the first replica sequence, having a first optical path length; and a second optical arm to receive the second replica sequence, having a second optical path length, different to the first optical path length by a path length difference; and an optical combiner arranged to combine the first replica sequence of pulses and the second replica sequence of delayed pulses to form an output sequence of optical pulse bursts.