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Terahertz pulse time-domain waveform detection method and system

A terahertz pulse, terahertz time domain technology, applied in the field of spectral detection, can solve problems such as difficulty in meeting polarization detection requirements, and achieve the effects of suppressing errors, eliminating repeatability deviations, and high angular resolution detection accuracy

Active Publication Date: 2017-08-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0008] The present invention provides a terahertz pulse time-domain waveform detection method and system to solve the technical problem that the existing terahertz pulse time-domain analysis is difficult to meet its polarization detection requirements

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  • Terahertz pulse time-domain waveform detection method and system
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[0050] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0051] A preferred embodiment of the present invention provides a terahertz pulse time-domain waveform detection method for detecting terahertz waves, referring to figure 1 , the method of this embodiment includes:

[0052] In step S100, the signal light corresponding to the terahertz time-domain electric field is generated by changing the delay of the probe light relative to the pump light, so as to realize the sampling of the terahertz electric field; the probe light in this embodiment is circularly polarized light.

[0053] Step S200, the signal light is divided into two paths by the beam splitter, and each path of light is photoelectrically detected and output to a dual-phase lock-in ampli...

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Abstract

The invention discloses a terahertz pulse time-domain waveform detection method and a system. The method comprises: using circularly polarized light as the probe light for terahertz time-domain waveform electro-optical sampling wherein the probe light is modulated in an electro-optical crystal and divided into two paths by a beam splitter with each path of signal light containing the polarization component information of the terahertz wave field; making the directions of these two components orthogonal through the light path adjustment; and in order for more accurate and more convenient detection of terahertz polarization angle, setting the modulation frequency of pump light as f, and using the modulation signal as the reference frequency of a two-phase lock-in amplifier wherein the front end of the two-phase lock-in amplifier adopts a dual channel multiplexer whose switching frequency is represented as 2f to perform switching of the electro-optical signals containing the terahertz component information. According to the invention, a two-phase lock-in amplifier is utilized to obtain the amplitude and polarization direction of a terahertz wave time-domain electric field; and then, through the change of the delay of the probe light and the terahertz wave, the terahertz time-domain polarization waveform can be worked out and the complete information about the terahertz wave can be obtained.

Description

technical field [0001] The invention relates to the field of spectrum detection, in particular to a method and system for detecting terahertz pulse time-domain waveforms. Background technique [0002] Terahertz radiation (terahertz wave) is a general term for electromagnetic waves of a specific band. Its corresponding electromagnetic spectrum is located between microwaves and infrared rays, and is in the transition stage from macroelectronics to microphotonics. 10 12 Hz(1THz=10 12 Hz) or so. People have been studying terahertz radiation for decades. In the early days, it was called submillimeter wave in the field of electronics, and it was called far infrared in the field of optics. The terahertz band usually refers to a frequency range of 0.3-3THz, but sometimes electromagnetic waves in the range of 0.1-10THz are called terahertz waves. [0003] Since the generation and detection of terahertz waves using ultrafast optoelectronic technology in the mid-1980s, the research...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
CPCG01J11/00
Inventor 吕治辉张栋文王小伟赵增秀袁建民
Owner NAT UNIV OF DEFENSE TECH
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