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    • 5. 发明公开
    • BROADBAND TERAHERTZ RADIATION GENERATION AND DETECTION SYSTEM AND METHOD
    • 宽带太赫兹辐射的产生和检测系统及方法
    • EP2013948A1
    • 2009-01-14
    • EP07720081.4
    • 2007-04-18
    • ETH Zurich
    • GÜNTER, PeterSCHNEIDER, Arno
    • H01S1/02G01N21/35
    • H01S1/02G01N21/3581G02F1/3515G02F1/3534G02F2203/13
    • The invention relates to a broadband Terahertz (THz) radiation generation and detection System and method. THz radiation is generated by optical rectification of an ultrashort pump pulse of a first wavelength having a duration in the picosecond- or sub-picosecond ränge in a first nonlinear optical crystal. The THz radiation is detected by electro-optic sampling or another appropriate method of a probe beam having a second wavelength in a second nonlinear optical crystal. According to the invention, at least one of the following conditions is fulfilled: a) the first wavelength is different from the second wavelength; b) the material of the first nonlinear optical crystal is different from the material of the second nonlinear optical crystal. This makes it possible to chose for the generation and for the detection process - independent of one another - the combination of wavelengths and nonlinear material and possibly other features of the pump/probe pulses like polarization with the highest efficiency for generation and detection of Terahertz pulses, respectively. In a preferred embodiment, lasers emitting in the infrared ränge are used to generate THz radiation in DAST crystals, and the frequency doubled beam is used to coherently detect the THz radiation in a Standard material like ZnTe. This makes it possible to provide efficient, stable, compact and cost effective THz Systems.
    • 8. 发明公开
    • Optical switch and optical monitoring device
    • 光开关和光学监测装置
    • EP1811703A1
    • 2007-07-25
    • EP07009620.1
    • 2005-08-30
    • FUJITSU LIMITED
    • Watanabe, Shigeki
    • H04J14/08G01J11/00
    • H04J14/08G01J11/00G02F1/3515G02F1/39H04B10/07953
    • The polarization direction of an optical signal is changed by a polarization controller (11) so as to be orthogonal to a main axis of a polarizer. A control pulse generator (12) generates control pulses from control beam with a wavelength which is different from the wavelength of the optical signal. The optical signal and the control pulse are input to a nonlinear optical fiber (14). In the nonlinear optical fiber (14), the optical signal, during a time period in which the optical signal and the control pulse coincide, is amplified with optical parametric amplification around a polarization direction of the control pulse. The optical signal, during the time period in which the optical signal and the control pulse coincide, passes through the polarizer (15).
    • 光信号的偏振方向由偏振控制器(11)改变,以便与偏振器的主轴正交。 控制脉冲发生器(12)从波长与光信号的波长不同的控制光束产生控制脉冲。 光信号和控制脉冲被输入到非线性光纤(14)。 在非线性光纤(14)中,在光信号和控制脉冲一致的时间段期间,利用围绕控制脉冲的偏振方向的光参量放大来放大光信号。 在光信号和控制脉冲重合的时间段期间,光信号通过偏振器(15)。
    • 9. 发明公开
    • Optical switch and optical waveform monitoring device
    • Optischer Schalter und Vorrichtung zurÜberwachungvon optischen Kurvenformen
    • EP1633066A3
    • 2006-06-21
    • EP05018767.3
    • 2005-08-30
    • FUJITSU LIMITED
    • Watanabe, Shigeki, Fujitsu Limited
    • H04J14/08G01J11/00
    • H04J14/08G01J11/00G02F1/3515G02F1/39H04B10/07953
    • The polarization direction of an optical signal is changed by a polarization controller (11) so as to be orthogonal to a main axis of a polarizer. A control pulse generator (12) generates control pulses from control beam with a wavelength which is different from the wavelength of the optical signal. The optical signal and the control pulse are input to a nonlinear optical fiber (14). In the nonlinear optical fiber (14), the optical signal, during a time period in which the optical signal and the control pulse coincide, is amplified with optical parametric amplification around a polarization direction of the control pulse. The optical signal, during the time period in which the optical signal and the control pulse coincide, passes through the polarizer (15).
    • 光信号的偏振方向由偏振控制器(11)改变成与偏振器的主轴正交。 控制脉冲发生器(12)从具有与光信号的波长不同的波长的控制光束产生控制脉冲。 光信号和控制脉冲输入到非线性光纤(14)。 在非线性光纤(14)中,在光信号和控制脉冲重合的时间段期间,光信号在控制脉冲的偏振方向附近被光参量放大放大。 在光信号和控制脉冲重合的时间段期间,光信号通过偏振器(15)。