阅读说明：本技术 一种用于太赫兹脉冲辐射器辐射波形的测量系统及测量方法 (Measuring system and measuring method for radiation waveform of terahertz pulse radiator ) 是由 龚鹏伟 谢文 刘爽 谌贝 姜河 于 2020-06-05 设计创作，主要内容包括：本发明公开一种用于太赫兹脉冲辐射器辐射波形的测量系统及测量方法,涉及辐射波测量技术领域,以解决传统辐射波形测量方法无法满足太赫兹脉冲辐射器辐射波形测量需求的问题。装置包括：激光重频锁定模块,根据时基参考信号对主光纤飞秒激光器和从光纤飞秒激光器的输出重复频率进行锁定,将重复频率差作为触发信号发送至采集设备；同步模块将输出信号同步至从光纤飞秒激光器的重复频率,为被测太赫兹脉冲辐射器提供触发信号,使被测太赫兹脉冲辐射器的辐射脉冲的重复频率与触发信号重复频率相同；太赫兹探测器在主光纤飞秒激光器激励下产生光生载流子,在被测辐射太赫兹脉冲作用下产生电流；采集设备对太赫兹探测器输出的电流信号进行采集。(The invention discloses a measuring system and a measuring method for a radiation waveform of a terahertz pulse radiator, relates to the technical field of radiation wave measurement, and aims to solve the problem that the traditional radiation waveform measuring method cannot meet the requirement of measurement of the radiation waveform of the terahertz pulse radiator. The device comprises: the laser repetition frequency locking module locks the output repetition frequency of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to the time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment; the synchronization module synchronizes the output signal to the repetition frequency of the slave optical fiber femtosecond laser, and provides a trigger signal for the measured terahertz pulse radiator, so that the repetition frequency of the radiation pulse of the measured terahertz pulse radiator is the same as the repetition frequency of the trigger signal; the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser and generates current under the action of a detected radiation terahertz pulse; the collecting device collects current signals output by the terahertz detector.)

1. A measurement system for a terahertz pulse radiator radiation waveform, comprising: the system comprises a laser repetition frequency locking module, a main optical fiber femtosecond laser, a slave optical fiber femtosecond laser, a synchronization module, a terahertz detector and acquisition equipment;

the laser repetition frequency locking module locks the output repetition frequencies of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to a time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment;

the synchronization module synchronizes an output signal to the repetition frequency of the slave fiber femtosecond laser and provides a trigger signal for the terahertz pulse radiator to be detected, so that the repetition frequency of the radiation pulse of the terahertz pulse radiator to be detected is the same as the repetition frequency of the trigger signal;

the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser, and the photon-generated carrier generates current under the action of a detected radiation terahertz pulse;

the collecting device collects current signals output by the terahertz detector.

2. The measurement system for terahertz pulse radiator radiation waveforms of claim 1, further comprising a rubidium clock connected to said laser re-frequency locking module and providing a time-based reference signal.

3. The system of claim 2, wherein a time-based reference signal frequency of the rubidium clock output is 10 MHz.

4. The system according to claim 3, wherein the output end of the laser repetition frequency locking module is connected with the signal triggering end of the acquisition device; and the signal acquisition end of the acquisition equipment is connected with the signal output end of the terahertz detector.

5. The system of claim 4, wherein the output wavelength of the main fiber femtosecond laser is 1560nm, the pulse width is 100fs, and the repetition frequency is f_{rep_1}＝100.000000MHz。

6. The system of claim 5, wherein the output wavelength of the fiber femtosecond laser is 1560nm, the pulse width is 200fs, and the repetition frequency is f_{rep_2}＝f_{rep_1}+Δf＝100.000000MHz+10Hz＝100.000010MHz。

7. The measurement system for terahertz pulse radiator radiation waveforms of claim 6, wherein the sampling interval at which the acquisition device actually acquires the measured signal is:

wherein: Δ f is the repetition frequency difference, Δ t₀＝1/S＝10ns，f_{rep_1}The repetition frequency of the main optical fiber femtosecond laser.

8. The measurement system for terahertz pulse radiator radiation waveforms of claim 7, wherein the true sampling interval of the collection device is Δ t-1 fs.

9. A measuring method using the measuring system for the radiation waveform of the terahertz pulse radiator according to any one of claims 1 to 8, characterized by comprising the following steps:

the laser repetition frequency locking module locks the output repetition frequency of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to the time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment;

the synchronization module synchronizes an output signal to the repetition frequency of the slave fiber femtosecond laser and provides a trigger signal for a measured terahertz pulse radiator, so that the repetition frequency of radiation pulses of the measured terahertz pulse radiator is the same as the repetition frequency of the trigger signal;

the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser, and the photon-generated carrier generates current under the action of a detected radiation terahertz pulse;

the collecting equipment collects current signals output by the terahertz detector.

10. The method of claim 9, further comprising the following steps before the laser repetition frequency locking module locks the output repetition frequencies of the main fiber femtosecond laser and the slave fiber femtosecond laser according to the time base reference signal and sends the repetition frequency difference as a trigger signal to the acquisition device:

and generating a time base reference signal by a rubidium clock, and sending the time base reference signal to the laser repetition frequency locking module.

Technical Field

The invention relates to the technical field of radiation wave measurement, in particular to a measurement system and a measurement method for radiation waveforms of a terahertz pulse radiator.

Background

The pulse radiator is a generator which radiates pulse signals to space through an antenna integrated with the pulse radiator, and is widely applied to the fields of pulse wireless synchronization, pulse radar, pulse imaging and the like. In order to optimize the design of the pulse radiator, improve the performance of the pulse radiator, ensure the application of the pulse radiator, and the like, the performance of the pulse radiator needs to be accurately measured. The key performance indexes of the pulse radiator mainly comprise pulse amplitude, rise time, half-width, bandwidth and the like, and in order to accurately measure the indexes, the waveform of a pulse signal radiated by the pulse radiator needs to be accurately measured. Therefore, measurement of the radiation waveform of the pulse radiator is very important.

With the rapid development of the pulse radiator in the direction of narrower and narrower pulse width and larger bandwidth of a radiation pulse signal, the terahertz pulse radiator appears, the pulse width of which is less than 10ps and the bandwidth of which is more than 100GHz, and the terahertz frequency band is reached. The traditional pulse radiator radiation waveform measuring method based on the broadband oscilloscope and the broadband antenna cannot meet the measurement requirement of the radiation waveform of the terahertz pulse radiator, and a new method needs to be explored and researched.

Disclosure of Invention

The invention aims to provide a system and a method for measuring radiation waveforms of a terahertz pulse radiator, which solve the problem that the radiation waveforms of the terahertz pulse radiator can not be accurately measured at present and improve the measurement accuracy.

In order to achieve the above purpose, the invention provides the following technical scheme:

a measurement system for a terahertz pulse radiator radiation waveform, comprising: the system comprises a laser repetition frequency locking module, a main optical fiber femtosecond laser, a slave optical fiber femtosecond laser, a synchronization module, a terahertz detector and acquisition equipment;

the laser repetition frequency locking module locks the output repetition frequencies of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to a time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment;

the synchronization module synchronizes an output signal to the repetition frequency of the slave fiber femtosecond laser and provides a trigger signal for the terahertz pulse radiator to be detected, so that the repetition frequency of the radiation pulse of the terahertz pulse radiator to be detected is the same as the repetition frequency of the trigger signal;

the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser, and the photon-generated carrier generates current under the action of a detected radiation terahertz pulse;

the collecting device collects current signals output by the terahertz detector.

Compared with the prior art, the terahertz pulse radiator has the advantages that the measurement bandwidth reaches 3THz, the sampling interval reaches 1fs, the equivalent sampling rate reaches 1000TSa/s, and the measurement level of the radiation waveform of the terahertz pulse radiator can be improved. Compared with the traditional measurement method based on the oscilloscope and the broadband antenna, the method has the advantages of wider bandwidth, higher sampling rate, larger dynamic range, higher accuracy and higher practicability.

The invention also provides a method for measuring the radiation waveform of the terahertz pulse radiator, which comprises the following steps:

the laser repetition frequency locking module locks the output repetition frequency of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to the time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment;

the synchronization module synchronizes an output signal to the repetition frequency of the slave fiber femtosecond laser and provides a trigger signal for a measured terahertz pulse radiator, so that the repetition frequency of radiation pulses of the measured terahertz pulse radiator is the same as the repetition frequency of the trigger signal;

the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser, and the photon-generated carrier generates current under the action of a detected radiation terahertz pulse;

the collecting equipment collects current signals output by the terahertz detector.

Compared with the prior art, the beneficial effects of the measuring method for the radiation waveform of the terahertz pulse radiator provided by the invention are the same as the beneficial effects of the measuring system for the radiation waveform of the terahertz pulse radiator in the technical scheme, and the details are not repeated here.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic block diagram of a measurement system for terahertz pulse radiator radiation waveforms in an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a method for measuring radiation waveform of a terahertz pulse radiator according to an embodiment of the present invention.

Reference numerals:

the system comprises a rubidium clock 1, a laser repetition frequency locking module 2, a main optical fiber femtosecond laser 3, a slave optical fiber femtosecond laser 4, a synchronization module 5, a terahertz detector 6, an acquisition device 7 and a detected terahertz pulse radiator 8.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention aims to provide a measuring method and a measuring system for radiation waveforms of a terahertz pulse radiator, which solve the problem that the radiation waveforms of the terahertz pulse radiator can not be accurately measured at present and improve the measuring accuracy. In order to ensure the measurement accuracy, the bandwidth of the measurement device is required to be more than 3 times the bandwidth of the device under test. At present, the highest bandwidth of a broadband oscilloscope is 110GHz, which is smaller than or equal to the bandwidth of a terahertz pulse radiator to be measured, and obviously, accurate measurement of the radiation waveform of the terahertz pulse radiator cannot be met.

With specific reference to fig. 1, the present invention provides a measurement system for radiation waveform of terahertz pulse radiator, including: the system comprises a laser repetition frequency locking module, a main optical fiber femtosecond laser, a slave optical fiber femtosecond laser, a synchronization module, a terahertz detector and acquisition equipment;

the laser repetition frequency locking module locks the output repetition frequency of the main optical fiber femtosecond laser and the slave optical fiber femtosecond laser according to the time base reference signal, and sends the repetition frequency difference as a trigger signal to the acquisition equipment;

the synchronization module synchronizes the output signal to the repetition frequency of the slave fiber femtosecond laser, provides a trigger signal for the measured terahertz pulse radiator, and enables the repetition frequency of the radiation pulse of the measured terahertz pulse radiator to be the same as the repetition frequency of the trigger signal;

the terahertz detector generates a photon-generated carrier under the excitation of the main optical fiber femtosecond laser, and the photon-generated carrier generates current under the action of a detected radiation terahertz pulse;

and the acquisition equipment is used for acquiring the current signal output by the terahertz detector.