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    Terahertz spectrometer phase modulator control using second harmonic nulling
    3.
    发明授权
    Terahertz spectrometer phase modulator control using second harmonic nulling 有权
    太赫兹光谱仪相位调制器控制采用二次谐波归零

    公开(公告)号：US09103715B1

    公开(公告)日：2015-08-11

    申请号：US14212542

    申请日：2014-03-14

    Applicant: Joseph R. Demers

    Inventor： Joseph R. Demers ,  Bryon L. Kasper

    IPC: G01J5/02 ,  G01J3/02

    CPC classification number: G01J3/28 ,  G01J3/42 ,  G01J3/433

    Abstract: Apparatus for analyzing, identifying, or imaging a target is configured to avoid and/or prevent nulls that may occur periodically during a terahertz sweep. Exemplary apparatus may utilize a second harmonic lock-in amplifier to generate an error signal used to adjust a DC bias of a phase modulator to maintain an in-phase relationship between beams to avoid nulls in an output signal during frequency sweeping.

    Abstract translation: 用于分析，识别或成像目标的装置被配置为避免和/或防止在太赫兹扫描期间周期性发生的零点。 示例性装置可以利用二次谐波锁定放大器来产生用于调整相位调制器的DC偏置的误差信号，以维持波束之间的同相关系，以避免在扫频期间输出信号中的零点。

    Terahertz frequency domain spectrometer with integrated dual laser module
    4.
    发明授权
    Terahertz frequency domain spectrometer with integrated dual laser module 有权
    具有集成双激光模块的太赫兹频域光谱仪

    公开(公告)号：US07936453B2

    公开(公告)日：2011-05-03

    申请号：US12062772

    申请日：2008-04-04

    Applicant: Ronald T. Logan, Jr. ,  Joseph R. Demers ,  Bryon L. Kasper

    Inventor： Ronald T. Logan, Jr. ,  Joseph R. Demers ,  Bryon L. Kasper

    IPC: G01N21/21

    CPC classification number: G01J3/42 ,  G01J3/10 ,  G01N21/3581

    Abstract: An apparatus for analyzing, identifying or imaging a target including an integrated dual laser module coupled to a pair of photoconductive switches to produce CW signals in the range of frequencies from 100 GHz to over 2 THz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral homodyne process to generate an electrical signal representative of some characteristics of the target with resolution less than 250 MHz. The photoconductive switches are activated by laser beams from the dual laser module. The lasers in the module are tuned to different frequencies and have two distinct low frequency identification tones respectively that are used in conjunction with a stable optical filter element to permit precise determination of the offset frequency of the lasers.

    Abstract translation: 一种用于分析，识别或成像目标的装置，所述目标包括耦合到一对光电导开关的集成双激光模块，以产生在从100GHz到超过2THz的频率范围内的CW信号，其聚焦并经由目标传送或反射; 以及检测器，用于从从目标接收的信号中获取光谱信息，并使用多光谱零差处理来产生表示具有小于250MHz的分辨率的目标的某些特性的电信号。 光导开关由来自双激光模块的激光束激活。 模块中的激光器被调谐到不同的频率，并且具有分别与稳定的光学滤波器元件结合使用的两个不同的低频识别音，以允许精确地确定激光器的偏移频率。

    Terahertz spectrometer with phase modulation and method
    5.
    发明授权
    Terahertz spectrometer with phase modulation and method 有权
    太赫兹光谱仪具有相位调制和方法

    公开(公告)号：US09086374B1

    公开(公告)日：2015-07-21

    申请号：US14262249

    申请日：2014-04-25

    Applicant: Joseph R. Demers ,  Bryon L. Kasper

    Inventor： Joseph R. Demers ,  Bryon L. Kasper

    IPC: G01J5/02 ,  G01N21/3563

    CPC classification number: G01N21/3563

    Abstract: A highly advantageous terahertz spectrometer with phase modulation and associated method are disclosed which utilize a second harmonic for generating an error signal to control a phase modulator to at least reduce nulls of an interference pattern.

    Abstract translation: 公开了一种具有相位调制和相关方法的非常有利的太赫兹光谱仪，其利用二次谐波来产生误差信号以控制相位调制器以至少减小干涉图案的零点。

    Terahertz Frequency Domain Spectrometer with Integrated Dual Laser Module
    6.
    发明申请
    Terahertz Frequency Domain Spectrometer with Integrated Dual Laser Module 有权
    具有集成双激光模块的太赫兹频域光谱仪

    公开(公告)号：US20100277726A1

    公开(公告)日：2010-11-04

    申请号：US12062772

    申请日：2008-04-04

    Applicant: Ronald T. Logan, JR. ,  Joseph R. Demers ,  Bryon L. Kasper

    Inventor： Ronald T. Logan, JR. ,  Joseph R. Demers ,  Bryon L. Kasper

    IPC: G01J3/28 ,  H01S3/08 ,  H01S3/04 ,  H01S3/10

    CPC classification number: G01J3/42 ,  G01J3/10 ,  G01N21/3581

    Abstract: An apparatus for analyzing, identifying or imaging an target including an integrated dual laser module coupled to a pair of photoconductive switches to produce cw signals in the range of frequencies from 100 GHz to over 2 THz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral homodyne process to generate an electrical signal representative of some characteristics of the target with resolution less than 250 MHz. The photoconductive switches are activated by laser beams from the dual laser module. The lasers in the module are tuned to different frequencies and have two distinct low frequency identification tones respectively that are used in conjunction with a stable optical filter element to permit precise determination of the offset frequency of the lasers.

    Abstract translation: 一种用于分析，识别或成像目标的装置，所述目标包括耦合到一对光电导开关的集成双激光模块，以产生聚焦在目标上并从所述目标传送或反射的从100GHz到超过2Hz的频率范围内的cw信号; 以及检测器，用于从从目标接收的信号中获取光谱信息，并使用多光谱零差处理来产生表示具有小于250MHz的分辨率的目标的某些特性的电信号。 光导开关由来自双激光模块的激光束激活。 模块中的激光器被调谐到不同的频率，并且具有分别与稳定的光学滤波器元件结合使用的两个不同的低频识别音，以允许精确地确定激光器的偏移频率。

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