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    • 1. 发明申请
    • 波長変換装置
    • WO2023084621A1
    • 2023-05-19
    • PCT/JP2021/041244
    • 2021-11-09
    • 日本電信電話株式会社
    • 風間 拓志渡邉 啓
    • G02F1/39G02F1/377
    • 本発明は、非線形光学素子を適切な温度で動作させ、その出力光を安定化することができる波長変換装置を提供することを目的とする。 本発明の波長変換装置(100)は、非線形光学素子(103)と、非線形光学素子(103)への入力光のパワーを調整する光パワー調整手段(102)と、非線形光学素子(103)の出力光を電気信号に変換し光パワー調整手段(102)にフィードバックするためのモニタ光検出手段(106)と、非線形光学素子(103)から出力する光のパワーが一定値となるように光パワー調整手段(102)の調整パラメータを設定する制御手段と、非線形光学素子(103)の温度を調節する温度調節手段(104)とを備え、 前記制御手段は、温度調整手段(104)を複数の異なる温度に設定し、複数の設定された温度に対応して設定される光パワー調整手段(102)の調整パラメータが最も小さくなる温度を、温度調整手段(104)による温度調節の目標温度に設定することを特徴とする。
    • 8. 发明申请
    • HIGH EFFICIENCY LASER SYSTEM FOR THIRD HARMONIC GENERATION
    • 高效率激光系统用于第三代谐波发生
    • WO2017172868A1
    • 2017-10-05
    • PCT/US2017/024678
    • 2017-03-29
    • IPG PHOTONICS CORPORATION
    • BABUSHKIN, AndreiBORDENYUK, Andrey
    • H01S3/109G02F1/377
    • A frequency conversion laser system is configured with a single mode (SM) laser source outputting a pulsed pump beam at a fundamental frequency and a nonlinear optical system operating to convert the fundamental frequency sequentially to a second harmonic (SH) and then third harmonic (TH). The nonlinear optical system includes an elongated SHG crystal traversed by the SM pulsed pump beam which generates the SH beam. The SHG crystal has an output surface inclined relative to a longitudinal axis of the SHG crystal at a first wedge angle different from a right angle. The nonlinear optical system further has an elongated THG crystal with an input surface which is impinged upon by a remainder of the pump and SHG beams which propagate through the THG crystal at a walk-off angle therebetween to generate a third harmonic (TH) beam, the input surface of the THG crystal being inclined to a longitudinal axis of the THG crystal at a second wedge angle. The output and input surfaces of respective SHG and THG crystals are inclined so as to minimize the walk-off angle between SH and IR pointing vectors in the THG crystal thereby improving the conversion efficiency and TH output beam's ellipticity.
    • 频率转换激光器系统配置有输出基频的脉冲泵浦光束的单模(SM)激光源和工作以将基频依次转换为二次谐波的非线性光学系统( SH)然后三次谐波(TH)。 非线性光学系统包括由产生SH光束的SM脉冲泵浦光束横穿的细长SHG晶体。 SHG晶体具有相对于SHG晶体的纵轴以不同于直角的第一楔角倾斜的输出表面。 该非线性光学系统还具有细长的THG晶体,该THG晶体具有输入表面,该输入表面受到泵的其余部分的冲击,以及SHG光束以其间的散步角度传播通过THG晶体以产生三次谐波(TH)光束, THG晶体的输入表面以第二楔角倾斜于THG晶体的纵轴。 相应SHG和THG晶体的输出和输入表面是倾斜的,以便使THG晶体中SH和IR指向矢量之间的离散角最小化,从而提高转换效率和TH输出光束的椭圆率。
    • 9. 发明申请
    • MEASURING APPARATUS AND METHOD FOR MEASURING TERAHERTZ PULSES
    • 测量装置和测量TERAHERTZ脉冲的方法
    • WO2016084322A1
    • 2016-06-02
    • PCT/JP2015/005643
    • 2015-11-12
    • CANON KABUSHIKI KAISHA
    • OUCHI, ToshihikoYUKAWA, Mitsuyoshi
    • G01N21/3581G02F1/365G02F1/377G01N21/88G01N21/94G01N21/95G02F1/37
    • G01N21/3581G01N21/9508G01N2021/845G02F2203/13
    • The present invention relates to a measuring apparatus (100) configured to measure terahertz pulses (6) transmitted through an object (8) or reflected by the object (8). The apparatus (100) includes a waveguide (48), a propagation unit (45), and a detection unit (9, 20). The waveguide (48) includes an electrooptical crystal (43) that generates terahertz pulses (6) from pulsed light (46) propagated in the electrooptical crystal (43). The propagation unit (45) is configured to propagate the terahertz pulses (6) generated from the electrooptical crystal (43). The detection unit (9, 20) is configured to detect an average output of the terahertz pulses (6) that are propagated through the propagation unit (45), are then applied to the object (8), and are transmitted through the object (8) or reflected by the object (8). The electrooptical crystal (43) has a lower refractive index at a center wavelength of the pulsed light (46) than a refractive index at a center wavelength of the terahertz pulses (6) generated from the electrooptical crystal (43).
    • 本发明涉及一种被配置为测量通过物体(8)透射或被物体(8)反射的太赫兹脉冲(6)的测量装置(100)。 装置(100)包括波导(48),传播单元(45)和检测单元(9,20)。 波导(48)包括从在光电晶体(43)中传播的脉冲光(46)产生太赫兹脉冲(6)的电光晶体(43)。 传播单元(45)被配置为传播由电光晶体(43)产生的太赫兹脉冲(6)。 检测单元(9,20)被配置为检测通过传播单元(45)传播的太赫兹脉冲(6)的平均输出,然后被施加到对象(8),并且通过对象( 8)或物体(8)反射。 电光晶体(43)在脉冲光(46)的中心波长处的折射率低于由电光晶体(43)产生的太赫兹脉冲(6)的中心波长处的折射率。