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公开(公告)号：WO2022253740A1
公开(公告)日：2022-12-08
申请号：PCT/EP2022/064574
申请日：2022-05-30
Applicant: SIGNIFY HOLDING B.V.
Abstract: A laser circuit has a current source for delivering current to a laser device. A pulse width modulation laser drive current is used, and the amplitude and duty cycle of the laser drive current is set in dependence on an estimated junction temperature. In this way efficiency may be kept high for different operating temperatures and a desired optical output power.
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公开(公告)号：WO2022226508A1
公开(公告)日：2022-10-27
申请号：PCT/US2022/071817
申请日：2022-04-20
Inventor： FENG, Liang , GAO, Zihe , MIDYA, Bikashkali , QIAO, Xingdu
Abstract: Provided are systems and methods for high-dimensional phase-locked microlaser arrays. In embodiments, systems and methods can comprise a main array of light sources resonating in a plurality of energy levels, including a fundamental mode, at least one superpartner array of resonators positioned adjacent to the main array, and at least one auxiliary resonator. The superpartner arrays and the auxiliary resonators at least partially dissipate a subset of the plurality of energy levels emitted by the main array, except for the fundamental mode. In embodiments, the light sources can be microring lasers and/or electrically injected lasers.
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公开(公告)号：WO2022207377A1
公开(公告)日：2022-10-06
申请号：PCT/EP2022/057271
申请日：2022-03-21
Applicant: SIGNIFY HOLDING B.V.
Inventor： WENDT, Matthias
Abstract: A lighting circuit comprises a current driver circuit and a series connection of at least two laser diodes, supplied with current from the current driver circuit. A current shunt circuit is in parallel with each laser diode for diverting a shunt current away from the respective laser diode. The level of the shunt currents is controlled during a start-up period of time of the current driver circuit in order to control the rate of change of voltage across selected laser diodes during said start-up period of time.
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公开(公告)号：WO2021191777A1
公开(公告)日：2021-09-30
申请号：PCT/IB2021/052368
申请日：2021-03-22
Applicant: SILANNA ASIA PTE LTD
Inventor： COLLES, Joseph H. , ROSENBAUM, Steven E. , MOLIN, Stuart B.
IPC: H01S5/042 , H01S5/026 , H01S5/06 , H01S5/068 , H01S5/40 , H01S5/0261 , H01S5/0428 , H01S5/06808 , H01S5/4025
Abstract: A pulsed laser diode driver includes an inductor having a first terminal configured to receive a source voltage. A source capacitor has a first terminal connected to the first terminal of the inductor to provide the source voltage. A bypass switch has a drain node connected to a second terminal of the inductor and to a first terminal of a bypass capacitor. A laser diode has an anode connected to the second terminal of the inductor and to the drain node of the bypass switch. A laser diode switch has a drain node connected to a cathode of the laser diode. The laser diode switch and the bypass switch control a current flow through the inductor to produce a high-current pulse through the laser diode, the high-current pulse corresponding to a peak current of a resonant waveform developed at the anode of the laser diode.
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5.发明申请
公开(公告)号：WO2021151860A1
公开(公告)日：2021-08-05
申请号：PCT/EP2021/051678
申请日：2021-01-26
Applicant: TRUMPF PHOTONIC COMPONENTS GMBH , ROBERT BOSCH GMBH
Inventor： BADER, Sven , WOLF, Robert
Abstract: The present invention relates to the field of optical particle sensing and in particular to a method of controlling an optical output power of a laser diode (10). A method of controlling an optical output power of a laser diode (10) is presented, wherein the laser diode is associated with a photodiode (20), wherein the photodiode converts light received from the laser diode into an electrical photodiode current; the method comprising the steps of: obtaining first optical trimming parameters indicative of a first optical output power of the laser diode (10) at a first laser diode current and a second optical output power of the laser diode at a second laser diode current different from the first laser diode current, above lasing threshold under predetermined calibration conditions; obtaining second electrical trimming parameters indicative of a photodiode characteristic curve of photodiode current versus laser diode current under the predetermined calibration conditions; measuring a first photodiode current at a third laser diode current below lasing threshold; measuring a second photodiode current at a fourth laser diode current different from the third laser diode current below lasing threshold; determining a slope of a photodiode current versus laser diode current based on said measurement of the first photodiode current and said second photodiode current below lasing threshold; controlling the optical output power of the laser diode (10) above lasing threshold based on the first optical trimming parameters, the second electrical trimming parameters and the slope of the photodiode current versus laser diode current below lasing threshold.
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Patent Agency Ranking6.发明申请
公开(公告)号：WO2020253960A1
公开(公告)日：2020-12-24
申请号：PCT/EP2019/066300
申请日：2019-06-19
Inventor： HAPPACH, Magnus , DE FELIPE MESQUIDA, David , KEIL, Norbert , SCHELL, Martin
Abstract: The invention relates to a method of determining and/or setting an emission wavelength of a laser device (1) comprising a laser (2) having a laser cavity (20) with a tunable reflection element (23) and an external feedback cavity (30) external to the laser (2) that reflects a portion of the light emitted by the laser (2) back into the laser cavity (20), the method comprising the steps of tuning of the reflection element (23) by changing an actuating variable during operation of the laser (2); measuring a voltage (V) at an active section (21) of the laser (2) during tuning of the reflection element (23); identifying a reference point (R) in the voltage curve dependent on the actuating variable and assigning a wavelength to the reference point (R); and determining and/or setting the emission wavelength of the laser device (1) using the reference point and the assigned wavelength. The invention also relates to a laser device.
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公开(公告)号：WO2020197496A1
公开(公告)日：2020-10-01
申请号：PCT/SG2020/050161
申请日：2020-03-25
Applicant: AMS SENSORS SINGAPORE PTE. LTD.
Inventor： MIGUEL-SÁNCHEZ, Javier
IPC: F21V25/02 , H01S5/00 , H01S5/068 , F21Y115/30
Abstract: An illumination system (200) includes an illumination device (202); an optical element (206) positioned to receive light (208) from the illumination device (202); a layer (210) of a transparent material disposed on the optical element (206) and positioned to receive light (208) from the illumination device (202); and an interlock circuit (220) configured to measure a resistivity of the layer (210) of transparent material and to control operation of the illumination device (202) based on the measured resistivity
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公开(公告)号：WO2020097790A1
公开(公告)日：2020-05-22
申请号：PCT/CN2018/115232
申请日：2018-11-13
Applicant: 深圳市创鑫激光股份有限公司
Abstract: 一种激光器功率稳定系统(100)、调节激光器功率的方法及装置。激光器功率稳定系统(100)包括：激光器谐振腔(10)，其包括机械调节装置(101)；分束镜(11)；功率探测器(12)，其用于获取分束镜(11)分束出来的激光以检测激光器的输出功率；控制器(13)，其分别与功率探测器(12)和机械调节装置(101)连接，控制器(13)用于获取输出功率并判断输出功率是否满足预设的标准输出功率，若否，则根据输出功率向机械调节装置(101)发送调节指令，以控制机械调节装置(101)进行调节，进而使输出功率满足预设的标准输出功率。当出现功率下降的问题后，不需要刻意的停机维修，在机器使用的同时便进行了自我恢复和调节，全程自动化控制，不需要任何人为调节，使得功率恢复更加快捷、准确。
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公开(公告)号：WO2019171552A1
公开(公告)日：2019-09-12
申请号：PCT/JP2018/009066
申请日：2018-03-08
Applicant: 三菱電機株式会社
IPC: H01S5/068 , H04B10/075
Abstract: レーザダイオードに印加するバイアス電流を制御することによって光出力を一定に保つ光モジュール（２）の寿命予測方法であて、寿命予測装置（１）が、光モジュール（２）からバイアス電流の電流値を取得する第１ステップと、バイアス電流の初期の電流値である初期バイアス電流値を保持する第２ステップと、バイアス電流値と初期バイアス電流値との差分値の桁数を算出し、桁数の増加が発生したか否かを判定する第３ステップと、桁数の増加の発生が検出される時間間隔を算出する第４ステップと、時間間隔と、第１閾値と、桁数とを用いて光モジュール（２）の寿命を推定する第５ステップとを含む。
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公开(公告)号：WO2019118408A1
公开(公告)日：2019-06-20
申请号：PCT/US2018/064876
申请日：2018-12-11
Applicant: MICROVISION, INC.
Inventor： MCVITTIE, Patrick J.
IPC: H01S5/068 , H01S5/00 , H01S5/06 , H01S5/0683
CPC classification number: H01S5/06812 , H01S5/0021 , H01S5/0035 , H01S5/0617 , H01S5/06216 , H01S5/06825 , H01S5/06832 , H01S5/06835 , H01S2301/06
Abstract: A laser drive circuit (700) compensates for laser diode (110) dynamics. A compensation value is determined from a sum of weighted basis functions. The basis functions may be a function of current desired optical powers and/or past desired optical powers. The weights may be updated periodically based at least in part on accumulated basis function outputs and measured optical powers.
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