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    LASER APPARATUS USING CAVITY DUMPING AND ACTIVE MODE LOCKING
    2.
    发明公开
    LASER APPARATUS USING CAVITY DUMPING AND ACTIVE MODE LOCKING 审中-公开
    与倾腔和主动模式锁定激光器件

    公开(公告)号：EP2885849A1

    公开(公告)日：2015-06-24

    申请号：EP12798846.7

    申请日：2012-10-23

    Applicant: Integrated Optics, UAB

    Inventor： JONUSKA, Jonas

    IPC: H01S3/11 ,  H01S3/107

    CPC classification number: H01S3/1103 ,  G02F1/0327 ,  H01S3/091 ,  H01S3/10038 ,  H01S3/10061 ,  H01S3/107 ,  H01S3/1075 ,  H01S3/11 ,  H01S3/1106 ,  H01S3/1109 ,  H01S3/1112 ,  H01S3/1121 ,  H01S3/115

    Abstract: This invention provides a solution for operating a mode-locking and cavity dumping laser apparatus using single electro-optical switch or modulator (2), such as a Pockels cell, without the need of multiplexing between two sources of voltage. The complex waveform of electrical signal, which controls the Pockels Cell (2) is achieved by employing the phenomena, called LC circuit ringing, where LC circuit is formed from an inductive element and a capacitor, where the Pockels Cell works as a capacitor itself. The ringing frequency should be calculated such that the period of oscillations is preferably two times longer than the round-trip time of a light pulse inside the optical cavity. As a result, optical losses are created inside the cavity with a period, which coincides with the travel of a light pulse, thus the pulse build-up is consistent and stable.

    CAPACITIVE LOAD DRIVING CIRCUIT
    3.
    发明公开
    CAPACITIVE LOAD DRIVING CIRCUIT 审中-公开
    驱动电路容性负载

    公开(公告)号：EP2775619A4

    公开(公告)日：2015-06-24

    申请号：EP12845714

    申请日：2012-08-23

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： YAMAGISHI SHOGO ,  FUJIMOTO MASATOSHI ,  TAKAHASHI AKIRA

    IPC: H03K4/02 ,  G02F1/03 ,  H03K17/691

    CPC classification number: H02M7/537 ,  G02F1/0327 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/08 ,  H01S3/1075 ,  H01S3/235 ,  H03K4/023 ,  H03K17/102 ,  H03K17/691 ,  H03K2017/6875 ,  H03K2217/009 ,  Y10T307/549

    Abstract: A driving circuit 1A is a circuit selectively outputting one of a staircase wave and a square wave from an output terminal 11, to drive a capacitive load 52, and includes a high-voltage power source 41 supplying a constant voltage VH, an FET 21 connected in series between the output terminal 11 and the high-voltage power source 41, a transformer 22 in which an output side coil is connected to a gate of the FET 21, an input terminal 12a connected to an input side coil of the transformer 22 via a capacitive element 23, a high-voltage power source 42 supplying a constant voltage VL lower than the constant voltage VH, an FET 31 connected in series between the output terminal 11 and the high-voltage power source 42, a transformer 32 in which an output side coil is connected to a gate of the FET 31, and an input terminal 12b connected to an input side coil of the transformer 32 via a capacitive element 33. Thereby, the circuit is realized which is capable of suitably providing a stair-shaped high-voltage pulse to the capacitive load.

    Method for operating a laser system
    4.
    发明公开
    Method for operating a laser system 有权
    Verfahren zum Betreiben eines Lasersystems

    公开(公告)号：EP2800212A1

    公开(公告)日：2014-11-05

    申请号：EP13002365.8

    申请日：2013-05-03

    Applicant: Fotona d.d.

    Inventor： Skrabelj, Dejan ,  Marincek, Marko

    IPC: H01S3/107 ,  H01S3/115 ,  H01S3/092 ,  H01S3/16 ,  H01S3/00 ,  G02F1/03

    CPC classification number: H01S3/115 ,  G02F1/0327 ,  H01S3/0092 ,  H01S3/092 ,  H01S3/10038 ,  H01S3/107 ,  H01S3/1611 ,  H01S3/1643 ,  H01S2301/02

    Abstract: The invention relates to a method for operating a laser system in a Q-switched mode, thereby generating a train of at least two subsequent laser pulses (p 1 ). The laser system has a laser resonator (1) with a laser medium (2) and an electro-optical modulator (3). The electro-optical modulator (3) comprises an EOM crystal (9), wherein the EOM crystal (9) has, when subjected to acoustic ringing, a characteristic ringing time (to). The EOM crystal (9) is driven by modulator voltage pulses (p m ) having a modulator voltage pulse duration (t m1 ). The modulator voltage pulse duration (t m1 ) is at least approximately equal to the characteristic ringing time (to) multiplied by an integer factor.
    The rising edge ("on") of the voltage pulse (p m ) generates an acoustic wave and the falling edge ("off") of the voltage pulse generates a counter-propagating acoustic wave. Proper choice of the duration (t ml ) of the voltage pulse, i.e. multiple integer of the reziprocal of the ringing ftrequency (t 0 ), results in destructive interference of the two acoustic waves and vanishing acoustic ringing.

    Abstract translation: 本发明涉及一种用于在Q开关模式中操作激光系统的方法，从而产生至少两个后续激光脉冲串（p 1）。 激光系统具有激光谐振器（1）和激光介质（2）和电光调制器（3）。 电光调制器（3）包括EOM晶体（9），其中EOM晶体（9）在受到声音振铃时具有特征振铃时间（to）。 EOM晶体（9）由具有调制器电压脉冲持续时间（t m1）的调制器电压脉冲（p m）驱动。 调制器电压脉冲持续时间（t m1）至少近似等于特征振铃时间（to）乘以整数因子。 电压脉冲（p m）的上升沿（“on”）产生声波，并且电压脉冲的下降沿（“截止”）产生相反传播的声波。 正确选择电压脉冲的持续时间（t ml），即振铃频率（t 0）的重新合并的多个整数，导致两声波的破坏性干扰和消声消声。

    PHOTORECEPTOR USING MACH-ZEHNDER INTERFEROMETER
    9.
    发明公开
    PHOTORECEPTOR USING MACH-ZEHNDER INTERFEROMETER 有权
    使用MACH-ZEHNDER干涉仪的光电传感器

    公开(公告)号：EP1953931A1

    公开(公告)日：2008-08-06

    申请号：EP06756401.3

    申请日：2006-05-19

    Applicant: NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： YONEYAMA, Mikio ,  SAITOU, Fumiaki ,  ONO, Shigeru ,  TAKEUCHI, Yosuke ,  YONENAGA, Kazushige ,  KUWAHARA, Shoichiro ,  YOSHIDA, Eiji ,  MIYAMOTO, Yutaka ,  KAWAKAMI, Hiroto

    IPC: H04B10/04 ,  G02F1/01 ,  H04B10/06 ,  H04B10/14 ,  H04B10/142 ,  H04B10/152 ,  H04B10/26 ,  H04B10/28 ,  H04L27/22

    CPC classification number: H04L27/2071 ,  G02F1/0327 ,  H04B10/677 ,  H04L27/223

    Abstract: The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control.
    A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.

    Abstract translation: 本发明涉及一种光学接收器，其中Mach-Zehnder干涉仪的透射率可以在简单的结构和控制下被锁定在正常操作点。 在平衡式光接收器之后并联地提供透射率检测电路和微小调制信号检测电路，并且开关可选择性地连接微小调制信号检测电路和透射率检测电路。 在频率引入的初始阶段，开关设置为将透射率检测电路连接到同步检测电路。 如果透射率检测电路检测到在载波频率处Mach-Zehnder干涉仪的透射率变成期望的透射率，则开关的连接从透射率检测电路切换到微小调制信号检测电路。

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