WO2019196614A1 - Method for wavefront phase modulation of terahertz wave - Google Patents

Method for wavefront phase modulation of terahertz wave Download PDF

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WO2019196614A1
WO2019196614A1 PCT/CN2019/078924 CN2019078924W WO2019196614A1 WO 2019196614 A1 WO2019196614 A1 WO 2019196614A1 CN 2019078924 W CN2019078924 W CN 2019078924W WO 2019196614 A1 WO2019196614 A1 WO 2019196614A1
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laser
phase modulation
terahertz wave
electric field
frequency
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PCT/CN2019/078924
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French (fr)
Chinese (zh)
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郑渚
杨彬
李程
丁庆
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雄安华讯方舟科技有限公司
深圳市太赫兹科技创新研究院
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/015—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/13—Function characteristic involving THZ radiation

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  • the present invention relates to the field of phase modulation, and in particular to a terahertz wavefront phase modulation method.
  • phase modulation technology of the optical band is very mature.
  • phase modulation of optical bands performed on large-area photoelectric down-converter components (such as large-area photoconductive antennas, nonlinear crystals, etc.) is very mature, and the wavefront phase
  • modulation has important applications in many fields.
  • the phase modulation of the terahertz beam is difficult due to the immature modulation device, which is an urgent problem to be solved.
  • a terahertz wavefront phase modulation method comprising:
  • phase modulation model into the terahertz beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated.
  • the step of acquiring electric field power radiated by the frequency converter includes:
  • the calculation formula of the superimposed electric field is:
  • ⁇ + is the frequency of the first laser
  • ⁇ - is the frequency of the second laser
  • the electric field power is proportional to the square of the superimposed electric field.
  • the step of acquiring the effective modulation light intensity of the frequency converter and the terahertz wave to be modulated by the electric field power comprises:
  • the frequency of the terahertz wave to be modulated is a difference between a preset frequency of the first laser and a preset frequency of the second laser.
  • the phase modulation variable is a phase difference between the first laser and the second laser.
  • the effective modulation light intensity is calculated as:
  • ⁇ THz is the frequency of the terahertz wave to be modulated
  • E 0 is an electric field approximation of the first laser and the second laser.
  • the step of processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave comprises:
  • a laser beam modulation is applied to the unchanged phase to obtain a phase modulation model of the terahertz wave.
  • the calculation formula of the phase modulation model of the terahertz wave is:
  • ⁇ THz is the frequency of the terahertz wave
  • E 0 is an approximate value of the electric field of the first laser and the second laser.
  • the above-described terahertz wavefront phase modulation method establishes a phase modulation model of a terahertz wave to be modulated by using two laser beams whose frequency difference is a terahertz wave frequency, and then shifts the phase modulation model to a terahertz beam.
  • the indirect flexible modulation of the terahertz wavefront phase is realized, which overcomes the problem that the terahertz wave phase modulation is difficult due to the immature existing related devices, and does not yet Additional power losses in addition to the optoelectronic downconversion losses are introduced.
  • FIG. 1 is a flow chart of a terahertz wavefront phase modulation method in an embodiment.
  • FIG. 1 is a flowchart of a terahertz wavefront phase modulation method in an embodiment.
  • the frequency of the first laser is ⁇ +
  • the frequency of the second laser is ⁇ -
  • the phase of the first laser is
  • the phase of the second laser is
  • a terahertz wavefront phase modulation method may include the steps S100-S500.
  • step S100 the first laser of the preset frequency and the second laser of the preset frequency are loaded to the same frequency converter.
  • the preset frequency of the first laser is ⁇ +
  • the preset frequency of the second laser is ⁇ ⁇
  • the frequencies of the first laser and the second laser can be selected according to actual operation requirements, and are not further limited herein. It can be selected at a frequency well known to those skilled in the art.
  • the frequency converter is also a photoelectric down-converter component, and can be used as a frequency converter such as a large-area photoconductive antenna, a nonlinear crystal, etc., and the invention is not limited to the selection of the frequency converter.
  • a first laser of frequency ⁇ + and a second laser of frequency ⁇ ⁇ are applied to the same opto-inverter component, for example, simultaneously to a large-area photoconductive antenna.
  • Step S200 Acquire an electric field power radiated by the frequency converter.
  • obtaining the electric field power radiated by the frequency converter may first acquire a superimposed electric field of the first laser and the second laser.
  • the electric field of the first laser may be expressed as:
  • the electric field of the second laser can be expressed as: Since the two lasers are simultaneously loaded into one photoelectric converter, the superimposed electric field for the two lasers can be expressed as:
  • the electric field power is proportional to the square of the superimposed electric field
  • the electric field power can be obtained by superposing the electric field: P ⁇
  • Step S300 obtaining, by the electric field power, an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated.
  • ⁇ THz is the frequency of the terahertz wave to be modulated
  • ⁇ THz ⁇ + - ⁇ -
  • phase modulation variable of the terahertz wave to be modulated for the phase modulation variable, a formula can be expressed as: among them, For the phase of the first laser, For the phase of the second laser, it can be understood that there is no specific numerical limitation for the phase of the first laser and the second laser, and adjustment can be made according to actual operation requirements and adjustment of the phase of the terahertz wave, which is well known to those skilled in the art. The laser phase value is sufficient.
  • the frequency and phase modulation variables of the terahertz wave are brought into the effective modulation light intensity to be further simplified:
  • Step S400 processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave to be modulated.
  • the phase of the first laser or the second laser is changed, where only the phase of the first laser may be changed, or only the phase of the second laser may be changed, and the phase is not changed.
  • a laser loaded modulation is used to acquire a phase modulation model of the terahertz wave.
  • the phase of the second laser is selected At the same time in the first laser Loading phase modulation, ie
  • the above effective modulation light intensity can be further written as:
  • ⁇ THz is the frequency of the terahertz wave
  • E 0 is an approximate value of the electric field of the first laser and the second laser.
  • the phase of the second laser may not be set. 0, here the value is for ease of explanation and understanding, it can be understood, or by setting the phase of the first laser
  • the method of loading the phase modulation on the second laser is not further limited in the present invention. It can be understood that how to change or set can be selected according to actual operation requirements, and there are many methods for loading modulation on the laser, for example, Flexible modulation of the laser wavefront phase is achieved using Diffraction Optical Elements (DOEs) or Spatial Light Modulators (SLMs).
  • DOEs Diffraction Optical Elements
  • SLMs Spatial Light Modulators
  • Step S500 introducing the phase modulation model into the terahertz beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated.
  • the phase modulation model obtained in the previous step is introduced into the photoelectric converter component, so that the phase structure of the terahertz wave to be modulated is retained, and then the terahertz beam to be modulated is introduced, and the two laser beams are passed through the previous step.
  • the direct modulation of the phase changes the phase of the terahertz wave to be modulated, thereby achieving indirect flexible modulation of the terahertz beam phase.
  • the phase modulation model of the terahertz wave to be modulated is established by using two laser beams whose frequency difference is the terahertz wave frequency, and then the phase modulation model is migrated to too
  • the indirect flexible modulation of the terahertz wavefront phase is realized by utilizing the phase modulation technology of the existing mature optical band, which overcomes the problem that the phase modulation of the terahertz wave caused by the immature existing related devices is difficult, and Additional power losses in addition to the optoelectronic downconversion losses are not introduced.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

A method for wavefront phase modulation of a terahertz wave, comprising: loading a first laser at a preset frequency and a second laser at a preset frequency to a same frequency converter; obtaining an electric field power radiated by the frequency converter; obtaining an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated by means of the electric field power; processing the first laser and the second laser according to the effective modulation light intensity to obtain a phase modulation model of the terahertz wave to be modulated; and introducing the phase modulation model into the terahertz wave beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated. According to the present invention, indirect flexible modulation on a wavefront phase of a terahertz wave is achieved by establishing a phase modulation model of a terahertz wave to be modulated by using two laser beams having a frequency difference of a terahertz wave frequency and further transferring the phase modulation model to the terahertz wave beam.

Description

一种太赫兹波波前相位调制方法A terahertz wavefront phase modulation method 技术领域Technical field
本发明涉及相位调制领域，特别是涉及一种太赫兹波波前相位调制方法。The present invention relates to the field of phase modulation, and in particular to a terahertz wavefront phase modulation method.
背景技术Background technique
目前光学波段的相位调制技术非常成熟，例如在大面积光电下变频器件(如大面积光电导天线、非线性晶体等)上进行的光学波段的相位调制等技术均已十分成熟，而波前相位调制作为电磁场调控的重要维度，在多个领域存在重要应用，但是在太赫兹频段，由于相关调制器件的不成熟，导致太赫兹波束的相位调制困难，这是亟需解决的问题。At present, the phase modulation technology of the optical band is very mature. For example, the phase modulation of optical bands performed on large-area photoelectric down-converter components (such as large-area photoconductive antennas, nonlinear crystals, etc.) is very mature, and the wavefront phase As an important dimension of electromagnetic field regulation, modulation has important applications in many fields. However, in the terahertz frequency band, the phase modulation of the terahertz beam is difficult due to the immature modulation device, which is an urgent problem to be solved.
发明内容Summary of the invention
基于此，有必要针对由于相关器件不成熟导致的太赫兹波相位调制困难问题，提供一种太赫兹波波前相位调制方法。Based on this, it is necessary to provide a terahertz wavefront phase modulation method for the difficulty of phase modulation of terahertz waves due to immature related devices.
一种太赫兹波波前相位调制方法，包括：A terahertz wavefront phase modulation method, comprising:
将预设频率的第一激光和预设频率的第二激光加载至同一变频器；Loading a first laser of a preset frequency and a second laser of a preset frequency to the same frequency converter;
获取所述变频器辐射出的电场功率；Obtaining electric field power radiated by the frequency converter;
通过所述电场功率获取所述变频器的有效调制光强以及待调制的太赫兹波；Obtaining, by the electric field power, an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated;
依据所述有效调制光强对所述第一激光和所述第二激光进行处理以获取所述待调制的太赫兹波的相位调制模型；Processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave to be modulated;
将所述相位调制模型引入所述待调制的太赫兹波束以实现所述待调制的太赫兹波的波前相位调制。Introducing the phase modulation model into the terahertz beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated.
在其中一个实施例中，所述获取所述变频器辐射出的电场功率的步骤，包括：In one embodiment, the step of acquiring electric field power radiated by the frequency converter includes:
获取所述第一激光和所述第二激光的叠加电场；Obtaining a superposed electric field of the first laser and the second laser;
根据所述叠加电场获取所述变频器辐射出的电场功率。Acquiring electric field power radiated by the frequency converter according to the superposed electric field.
在其中一个实施例中，所述叠加电场的计算公式为：In one of the embodiments, the calculation formula of the superimposed electric field is:
Figure PCTCN2019078924-appb-000001
Figure PCTCN2019078924-appb-000001
其中，
Figure PCTCN2019078924-appb-000002
为第一激光的电场，
Figure PCTCN2019078924-appb-000003
为第二激光的电场，ω +为第一激光的频率，ω -为第二激光的频率，
Figure PCTCN2019078924-appb-000004
为第一激光的相位，
Figure PCTCN2019078924-appb-000005
为第二激光的相位。 among them,
Figure PCTCN2019078924-appb-000002
Is the electric field of the first laser,
Figure PCTCN2019078924-appb-000003
For the electric field of the second laser, ω + is the frequency of the first laser, and ω - is the frequency of the second laser,
Figure PCTCN2019078924-appb-000004
For the phase of the first laser,
Figure PCTCN2019078924-appb-000005
Is the phase of the second laser.
在其中一个实施例中，所述电场功率与所述叠加电场的平方成正比。In one of the embodiments, the electric field power is proportional to the square of the superimposed electric field.
在其中一个实施例中，所述通过所述电场功率获取所述变频器的有效调制光强以及待调制的太赫兹波的步骤，包括：In one embodiment, the step of acquiring the effective modulation light intensity of the frequency converter and the terahertz wave to be modulated by the electric field power comprises:
根据所述电场功率获取所述待调制的太赫兹波的频率以及相位调制变量；Obtaining a frequency of the terahertz wave to be modulated and a phase modulation variable according to the electric field power;
根据所述频率和所述相位调制变量获取所述变频器的有效调制光强。Obtaining an effective modulation light intensity of the frequency converter based on the frequency and the phase modulation variable.
在其中一个实施例中，所述待调制的太赫兹波的频率为所述第一激光的预设频率与所述第二激光的预设频率之间的差值。In one embodiment, the frequency of the terahertz wave to be modulated is a difference between a preset frequency of the first laser and a preset frequency of the second laser.
在其中一个实施例中，所述相位调制变量为所述第一激光与所述第二激光的相位差值。In one embodiment, the phase modulation variable is a phase difference between the first laser and the second laser.
在其中一个实施例中，所述有效调制光强的计算公式为：In one of the embodiments, the effective modulation light intensity is calculated as:
Figure PCTCN2019078924-appb-000006
Figure PCTCN2019078924-appb-000006
其中，ω THz为所述待调制的太赫兹波的频率，
Figure PCTCN2019078924-appb-000007
为相位调制变量，E 0为第一激光与第二激光的电场近似值。 Where ω THz is the frequency of the terahertz wave to be modulated,
Figure PCTCN2019078924-appb-000007
For the phase modulation variable, E 0 is an electric field approximation of the first laser and the second laser.
在其中一个实施例中，所述依据所述有效调制光强对所述第一激光和所述第二激光进行处理以获取所述太赫兹波的相位调制模型的步骤，包括：In one embodiment, the step of processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave comprises:
依据所述有效调制光强改变所述第一激光或所述第二激光的相位；Changing a phase of the first laser or the second laser according to the effective modulation light intensity;
同时对未改变相位的一束激光加载调制以获取所述太赫兹波的相位调制模型。At the same time, a laser beam modulation is applied to the unchanged phase to obtain a phase modulation model of the terahertz wave.
在其中一个实施例中，所述太赫兹波的相位调制模型的计算公式为：In one of the embodiments, the calculation formula of the phase modulation model of the terahertz wave is:
Figure PCTCN2019078924-appb-000008
Figure PCTCN2019078924-appb-000008
其中，ω THz为太赫兹波的频率，E 0为第一激光与第二激光的电场近似值，
Figure PCTCN2019078924-appb-000009
为待调制的太赫兹波的相位。 Where ω THz is the frequency of the terahertz wave, and E 0 is an approximate value of the electric field of the first laser and the second laser.
Figure PCTCN2019078924-appb-000009
The phase of the terahertz wave to be modulated.
上述太赫兹波波前相位调制方法，通过以两束频率差值为太赫兹波频率的激光来建立待调制的太赫兹波的相位调制模型的方式，进而将该相位调制模型迁移至太赫兹波束上，通过利用现有成熟的光学波段的相位调制技术，实现了太赫兹波波前相位的间接灵活调制，克服了现有相关器件不成熟导致的太赫兹波相位调制困难的问题，并且还不会引入除光电下变频损耗外的额外功率损耗。The above-described terahertz wavefront phase modulation method establishes a phase modulation model of a terahertz wave to be modulated by using two laser beams whose frequency difference is a terahertz wave frequency, and then shifts the phase modulation model to a terahertz beam. In addition, by using the existing mature optical band phase modulation technology, the indirect flexible modulation of the terahertz wavefront phase is realized, which overcomes the problem that the terahertz wave phase modulation is difficult due to the immature existing related devices, and does not yet Additional power losses in addition to the optoelectronic downconversion losses are introduced.
附图说明DRAWINGS
图1为一实施例中的太赫兹波波前相位调制方法流程图。1 is a flow chart of a terahertz wavefront phase modulation method in an embodiment.
具体实施方式detailed description
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的较佳实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。In order to facilitate the understanding of the present application, the present application will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. However, the application can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the understanding of the disclosure of the present application will be more thorough.
除非另有定义，本文所使用的所有的技术和科学术语与属于发明的技术领域的技术人员通常理解的含义相同。本文中在发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used herein have the same meaning meaning meaning The terminology used in the description of the invention herein is for the purpose of describing the particular embodiments The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
请参阅图1，为一实施例中的太赫兹波波前相位调制方法流程图。为了便于后面实施例进行详细的描述，第一激光的频率为ω +，第二激光的频率为ω -，第一激光的相位为
Figure PCTCN2019078924-appb-000010
第二激光的相位为
Figure PCTCN2019078924-appb-000011
一种太赫兹波波前相位调制方法，可以包括步骤：S100～S500。 Please refer to FIG. 1, which is a flowchart of a terahertz wavefront phase modulation method in an embodiment. In order to facilitate the detailed description of the following embodiments, the frequency of the first laser is ω + , the frequency of the second laser is ω - , and the phase of the first laser is
Figure PCTCN2019078924-appb-000010
The phase of the second laser is
Figure PCTCN2019078924-appb-000011
A terahertz wavefront phase modulation method may include the steps S100-S500.
步骤S100，将预设频率的第一激光和预设频率的第二激光加载至同一变频器。In step S100, the first laser of the preset frequency and the second laser of the preset frequency are loaded to the same frequency converter.
具体地，第一激光的预设频率为ω +，第二激光的预设频率为ω -，可以理解，第一激光和第二激光的频率可以根据实际操作需要进行选择，这里不做进一步 限定，以本领域技术人员熟知的频率选择即可。变频器也就是光电下变频器件，可以使用如大面积光电导天线、非线性晶体等作为变频器，对于变频器的选择，本发明不做限定。将频率为ω +的第一激光和频率为ω -的第二激光加载至同一个光电下变频器件，例如，同时加载至大面积光电导天线。 Specifically, the preset frequency of the first laser is ω + , and the preset frequency of the second laser is ω − , it can be understood that the frequencies of the first laser and the second laser can be selected according to actual operation requirements, and are not further limited herein. It can be selected at a frequency well known to those skilled in the art. The frequency converter is also a photoelectric down-converter component, and can be used as a frequency converter such as a large-area photoconductive antenna, a nonlinear crystal, etc., and the invention is not limited to the selection of the frequency converter. A first laser of frequency ω + and a second laser of frequency ω − are applied to the same opto-inverter component, for example, simultaneously to a large-area photoconductive antenna.
步骤S200，获取所述变频器辐射出的电场功率。Step S200: Acquire an electric field power radiated by the frequency converter.
具体地，获取变频器辐射出的电场功率可以先获取第一激光和第二激光的叠加电场，示例性地，第一激光的电场可以表示为：
Figure PCTCN2019078924-appb-000012
第二激光的电场可以表示为：
Figure PCTCN2019078924-appb-000013
因为两束激光同时加载至一个光电变频器，故，对于两束激光的叠加电场可以表示为： Specifically, obtaining the electric field power radiated by the frequency converter may first acquire a superimposed electric field of the first laser and the second laser. For example, the electric field of the first laser may be expressed as:
Figure PCTCN2019078924-appb-000012
The electric field of the second laser can be expressed as:
Figure PCTCN2019078924-appb-000013
Since the two lasers are simultaneously loaded into one photoelectric converter, the superimposed electric field for the two lasers can be expressed as:
Figure PCTCN2019078924-appb-000014
Figure PCTCN2019078924-appb-000014
同时，由于电场功率与叠加电场的平方成正比，所以，通过叠加电场可以获取电场功率：P∝|E(t)| 2。 At the same time, since the electric field power is proportional to the square of the superimposed electric field, the electric field power can be obtained by superposing the electric field: P∝|E(t)| 2 .
步骤S300，通过所述电场功率获取所述变频器的有效调制光强以及待调制的太赫兹波。Step S300, obtaining, by the electric field power, an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated.
具体地，在光电下变频中，为了便于数据的处理，一般设置E +＝E -＝E 0，也即是E 0为第一激光与第二激光的电场近似值。故，通过电场功率与叠加电场的平方成正比，可以得到： Specifically, in the photoelectric down-conversion, in order to facilitate data processing, E + = E - = E 0 is generally set, that is, E 0 is an electric field approximation of the first laser and the second laser. Therefore, by the electric field power proportional to the square of the superimposed electric field, it can be obtained:
Figure PCTCN2019078924-appb-000015
Figure PCTCN2019078924-appb-000015
由于半导体光电器件的电子响应速率限制，光生载流子的响应速度跟不上和频项
Figure PCTCN2019078924-appb-000016
的振荡速度，所以只受直流项(1)及差频项
Figure PCTCN2019078924-appb-000017
的调制，同时使用高频近似的方法对上述公式进行进一步近似处理，因此对半导体光生载流子的有效调制光强可以表示为： Due to the electronic response rate limitation of semiconductor optoelectronic devices, the response speed of photogenerated carriers cannot keep up with the frequency term.
Figure PCTCN2019078924-appb-000016
Oscillation speed, so only subject to DC term (1) and difference frequency term
Figure PCTCN2019078924-appb-000017
The modulation is further approximated by a high-frequency approximation method, so the effective modulation intensity of the semiconductor photo-generated carriers can be expressed as:
Figure PCTCN2019078924-appb-000018
Figure PCTCN2019078924-appb-000018
其中，ω THz为待调制的太赫兹波的频率，其具体数值可以用第一激光的频率与第二激光的频率之间的差值表示，也就是ω THz＝ω +-ω -，可以理解，这里对于太赫兹波的频率没有具体的数值限定，可以根据实际操作需要进行调整，以本领域技术人员熟知的太赫兹波的频率数值即可。同时，设置
Figure PCTCN2019078924-appb-000019
为待调制的太赫兹波的相位调制变量，对于相位调制变量，有公式可以表示为：
Figure PCTCN2019078924-appb-000020
其中，
Figure PCTCN2019078924-appb-000021
为第一激光的相位，
Figure PCTCN2019078924-appb-000022
为第二激光的相位，可以理解，这里对于第一激光和第二激光的相位没有具体的数值限定，可以根据实际操作需要以及太赫兹波相位的调整需要进行调整，以本领域技术人员熟知的激光相位数值即可。将太赫兹波的频率、相位调制变量带入有效调制光强中进一步化简得到： Where ω THz is the frequency of the terahertz wave to be modulated, and the specific value thereof can be expressed by the difference between the frequency of the first laser and the frequency of the second laser, that is, ω THz = ω + - ω - , which can be understood Here, there is no specific numerical limit for the frequency of the terahertz wave, and it can be adjusted according to actual operation needs, and the frequency value of the terahertz wave well known to those skilled in the art can be used. At the same time, set
Figure PCTCN2019078924-appb-000019
For the phase modulation variable of the terahertz wave to be modulated, for the phase modulation variable, a formula can be expressed as:
Figure PCTCN2019078924-appb-000020
among them,
Figure PCTCN2019078924-appb-000021
For the phase of the first laser,
Figure PCTCN2019078924-appb-000022
For the phase of the second laser, it can be understood that there is no specific numerical limitation for the phase of the first laser and the second laser, and adjustment can be made according to actual operation requirements and adjustment of the phase of the terahertz wave, which is well known to those skilled in the art. The laser phase value is sufficient. The frequency and phase modulation variables of the terahertz wave are brought into the effective modulation light intensity to be further simplified:
Figure PCTCN2019078924-appb-000023
Figure PCTCN2019078924-appb-000023
步骤S400，依据所述有效调制光强对所述第一激光和所述第二激光进行处理以获取所述待调制的太赫兹波的相位调制模型。Step S400, processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave to be modulated.
具体地，根据有效调制光强的公式，改变第一激光或第二激光的相位，这里可以是只改变第一激光的相位，也可以是只改变第二激光的相位，同时对未改变相位的一束激光加载调制以获取太赫兹波的相位调制模型。示例性地，选取第二激光的相位
Figure PCTCN2019078924-appb-000024
同时在第一激光
Figure PCTCN2019078924-appb-000025
上加载相位调制，即
Figure PCTCN2019078924-appb-000026
上述有效调制光强可以进一步写为： Specifically, according to the formula of the effective modulation light intensity, the phase of the first laser or the second laser is changed, where only the phase of the first laser may be changed, or only the phase of the second laser may be changed, and the phase is not changed. A laser loaded modulation is used to acquire a phase modulation model of the terahertz wave. Illustratively, the phase of the second laser is selected
Figure PCTCN2019078924-appb-000024
At the same time in the first laser
Figure PCTCN2019078924-appb-000025
Loading phase modulation, ie
Figure PCTCN2019078924-appb-000026
The above effective modulation light intensity can be further written as:
Figure PCTCN2019078924-appb-000027
Figure PCTCN2019078924-appb-000027
其中，ω THz为太赫兹波的频率，E 0为第一激光与第二激光的电场近似值，
Figure PCTCN2019078924-appb-000028
为待调制的太赫兹波的相位。当然，也可以不设置第二激光的相位
Figure PCTCN2019078924-appb-000029
为0，这里这样取值是为了便于解释和理解，可以理解，也可以是通过设置第一激光的相位
Figure PCTCN2019078924-appb-000030
而在第二激光上加载相位调制的方式，本发明对此不做进一步的限定，可以理解，具体怎样改变或者设置可以根据实际操作需要进行选择，在激光上加载调制的方法有很多，例如可以使用衍射光学元件(Diffraction Optical Elements，DOEs)或者空间光调制器(Spatial Light Modulators，SLMs)等， 来实现激光波前相位的灵活调制。 Where ω THz is the frequency of the terahertz wave, and E 0 is an approximate value of the electric field of the first laser and the second laser.
Figure PCTCN2019078924-appb-000028
The phase of the terahertz wave to be modulated. Of course, the phase of the second laser may not be set.
Figure PCTCN2019078924-appb-000029
0, here the value is for ease of explanation and understanding, it can be understood, or by setting the phase of the first laser
Figure PCTCN2019078924-appb-000030
The method of loading the phase modulation on the second laser is not further limited in the present invention. It can be understood that how to change or set can be selected according to actual operation requirements, and there are many methods for loading modulation on the laser, for example, Flexible modulation of the laser wavefront phase is achieved using Diffraction Optical Elements (DOEs) or Spatial Light Modulators (SLMs).
步骤S500，将所述相位调制模型引入所述待调制的太赫兹波束以实现所述待调制的太赫兹波的波前相位调制。Step S500, introducing the phase modulation model into the terahertz beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated.
具体地，将前一步骤得到的相位调制模型引入光电变频器件，这样由于待调制的太赫兹波的相位结构得到保留，然后再引入待调制的太赫兹波束，通过前一步骤对两束激光的相位的直接调制使待调制的太赫兹波的相位发生变化，从而实现太赫兹波束相位的间接灵活调制。Specifically, the phase modulation model obtained in the previous step is introduced into the photoelectric converter component, so that the phase structure of the terahertz wave to be modulated is retained, and then the terahertz beam to be modulated is introduced, and the two laser beams are passed through the previous step. The direct modulation of the phase changes the phase of the terahertz wave to be modulated, thereby achieving indirect flexible modulation of the terahertz beam phase.
上述太赫兹波波前相位调制方法实施例，通过以两束频率差值为太赫兹波频率的激光来建立待调制的太赫兹波的相位调制模型的方式，进而将该相位调制模型迁移至太赫兹波束上，通过利用现有成熟的光学波段的相位调制技术，实现了太赫兹波波前相位的间接灵活调制，克服了现有相关器件不成熟导致的太赫兹波相位调制困难的问题，并且还不会引入除光电下变频损耗外的额外功率损耗。In the above embodiment of the terahertz wavefront phase modulation method, the phase modulation model of the terahertz wave to be modulated is established by using two laser beams whose frequency difference is the terahertz wave frequency, and then the phase modulation model is migrated to too On the Hertzian beam, the indirect flexible modulation of the terahertz wavefront phase is realized by utilizing the phase modulation technology of the existing mature optical band, which overcomes the problem that the phase modulation of the terahertz wave caused by the immature existing related devices is difficult, and Additional power losses in addition to the optoelectronic downconversion losses are not introduced.
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (10)

  1. 一种太赫兹波波前相位调制方法，其特征在于，包括：A terahertz wavefront phase modulation method, comprising:
    将预设频率的第一激光和预设频率的第二激光加载至同一变频器；Loading a first laser of a preset frequency and a second laser of a preset frequency to the same frequency converter;
    获取所述变频器辐射出的电场功率；Obtaining electric field power radiated by the frequency converter;
    通过所述电场功率获取所述变频器的有效调制光强以及待调制的太赫兹波；Obtaining, by the electric field power, an effective modulation light intensity of the frequency converter and a terahertz wave to be modulated;
    依据所述有效调制光强对所述第一激光和所述第二激光进行处理以获取所述待调制的太赫兹波的相位调制模型；Processing the first laser and the second laser according to the effective modulated light intensity to obtain a phase modulation model of the terahertz wave to be modulated;
    将所述相位调制模型引入所述待调制的太赫兹波束以实现所述待调制的太赫兹波的波前相位调制。Introducing the phase modulation model into the terahertz beam to be modulated to implement wavefront phase modulation of the terahertz wave to be modulated.
  2. 根据权利要求1所述的太赫兹波波前相位调制方法，其特征在于，所述获取所述变频器辐射出的电场功率的步骤，包括：The terahertz wavefront phase modulation method according to claim 1, wherein the step of acquiring the electric field power radiated by the frequency converter comprises:
    获取所述第一激光和所述第二激光的叠加电场；Obtaining a superposed electric field of the first laser and the second laser;
    根据所述叠加电场获取所述变频器辐射出的电场功率。Acquiring electric field power radiated by the frequency converter according to the superposed electric field.
  3. 根据权利要求2所述的太赫兹波波前相位调制方法，其特征在于，所述叠加电场的计算公式为：The terahertz wavefront phase modulation method according to claim 2, wherein the calculation formula of the superimposed electric field is:
    Figure PCTCN2019078924-appb-100001
    Figure PCTCN2019078924-appb-100001
    其中，
    Figure PCTCN2019078924-appb-100002
    为第一激光的电场，
    Figure PCTCN2019078924-appb-100003
    为第二激光的电场，ω +为第一激光的频率，ω -为第二激光的频率，
    Figure PCTCN2019078924-appb-100004
    为第一激光的相位，
    Figure PCTCN2019078924-appb-100005
    为第二激光的相位。     among them,
    Figure PCTCN2019078924-appb-100002
    Is the electric field of the first laser,
    Figure PCTCN2019078924-appb-100003
    For the electric field of the second laser, ω + is the frequency of the first laser, and ω - is the frequency of the second laser,
    Figure PCTCN2019078924-appb-100004
    For the phase of the first laser,
    Figure PCTCN2019078924-appb-100005
    Is the phase of the second laser.
  4. 根据权利要求2所述的太赫兹波波前相位调制方法，其特征在于，所述电场功率与所述叠加电场的平方成正比。The terahertz wavefront phase modulation method according to claim 2, wherein said electric field power is proportional to a square of said superimposed electric field.
  5. 根据权利要求1所述的太赫兹波波前相位调制方法，其特征在于，所述通过所述电场功率获取所述变频器的有效调制光强以及待调制的太赫兹波的步骤，包括：The terahertz wavefront phase modulation method according to claim 1, wherein the step of acquiring the effective modulated light intensity of the frequency converter and the terahertz wave to be modulated by the electric field power comprises:
    根据所述电场功率获取所述待调制的太赫兹波的频率以及相位调制变量；Obtaining a frequency of the terahertz wave to be modulated and a phase modulation variable according to the electric field power;
    根据所述频率和所述相位调制变量获取所述变频器的有效调制光强。Obtaining an effective modulation light intensity of the frequency converter based on the frequency and the phase modulation variable.
  6. 根据权利要求5所述的太赫兹波波前相位调制方法，其特征在于，所述待调制的太赫兹波的频率为所述第一激光的预设频率与所述第二激光的预设频率之间的差值。The terahertz wavefront phase modulation method according to claim 5, wherein the frequency of the terahertz wave to be modulated is a preset frequency of the first laser and a preset frequency of the second laser The difference between.
  7. 根据权利要求5所述的太赫兹波波前相位调制方法，其特征在于，所述相位调制变量为所述第一激光与所述第二激光的相位差值。The terahertz wavefront phase modulation method according to claim 5, wherein the phase modulation variable is a phase difference value between the first laser and the second laser.
  8. 根据权利要求5所述的太赫兹波波前相位调制方法，其特征在于，所述有效调制光强的计算公式为：The terahertz wavefront phase modulation method according to claim 5, wherein the calculation formula of the effective modulation light intensity is:
    Figure PCTCN2019078924-appb-100006
    Figure PCTCN2019078924-appb-100006
    其中，ω THz为所述待调制的太赫兹波的频率，
    Figure PCTCN2019078924-appb-100007
    为相位调制变量，E 0为第一激光与第二激光的电场近似值。     Where ω THz is the frequency of the terahertz wave to be modulated,
    Figure PCTCN2019078924-appb-100007
    For the phase modulation variable, E 0 is an electric field approximation of the first laser and the second laser.
  9. 根据权利要求1所述的太赫兹波波前相位调制方法，其特征在于，所述依据所述有效调制光强对所述第一激光和所述第二激光进行处理以获取所述太赫兹波的相位调制模型的步骤，包括：The terahertz wavefront phase modulation method according to claim 1, wherein said first laser and said second laser are processed according to said effective modulated light intensity to obtain said terahertz wave The steps of the phase modulation model include:
    依据所述有效调制光强改变所述第一激光或所述第二激光的相位；Changing a phase of the first laser or the second laser according to the effective modulation light intensity;
    同时对未改变相位的一束激光加载调制以获取所述太赫兹波的相位调制模型。At the same time, a laser beam modulation is applied to the unchanged phase to obtain a phase modulation model of the terahertz wave.
  10. 根据权利要求9所述的太赫兹波波前相位调制方法，其特征在于，所述太赫兹波的相位调制模型的计算公式为：The terahertz wave wavefront phase modulation method according to claim 9, wherein the calculation formula of the phase modulation model of the terahertz wave is:
    Figure PCTCN2019078924-appb-100008
    Figure PCTCN2019078924-appb-100008
    其中，ω THz为太赫兹波的频率，E 0为第一激光与第二激光的电场近似值，
    Figure PCTCN2019078924-appb-100009
    为待调制的太赫兹波的相位。     Where ω THz is the frequency of the terahertz wave, and E 0 is an approximate value of the electric field of the first laser and the second laser.
    Figure PCTCN2019078924-appb-100009
    The phase of the terahertz wave to be modulated.
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