A method for generating and detecting narrowband terahertz waves based on subwavelength waveguides

A terahertz wave and sub-wavelength technology, which is applied in the field of narrow-band terahertz wave generation and detection based on sub-wavelength waveguides, can solve the problems of difficult phase matching and limit the efficient excitation of coherent narrow-band terahertz waves, so as to reduce complexity, The effect of low cost and simple installation

Active Publication Date: 2019-06-14
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different velocities of terahertz waves and femtosecond lasers, it is still difficult to achieve phase matching due to the deviation between the two during transmission, which limits the efficient excitation of coherent narrow-band terahertz waves.

Method used

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  • A method for generating and detecting narrowband terahertz waves based on subwavelength waveguides
  • A method for generating and detecting narrowband terahertz waves based on subwavelength waveguides
  • A method for generating and detecting narrowband terahertz waves based on subwavelength waveguides

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Embodiment

[0046] The specific steps of the narrowband terahertz wave generation and detection method based on the subwavelength waveguide are as follows:

[0047] (1) A y-cut magnesium-doped lithium niobate subwavelength waveguide with a size of 1cm×30μm×1.1cm is used as a terahertz radiation source, which is vertically fixed behind the cylindrical lens;

[0048] (2) Start the titanium sapphire femtosecond laser to generate a laser pulse with a wavelength of 800nm, a repetition rate of 1KHz, and a pulse width of 120fs. The laser pulse is irradiated to the beam splitter at an angle of 45°. The reflected light is the pumping light, and the transmitted light is the detection light. , the initial phases of the pump light and the probe light are the same but the average powers are 450mW and 50mW, respectively;

[0049] (3) The pump light is reflected by the fourth reflector, the fifth reflector and the sixth reflector, and then focused on the side of the terahertz wave radiation source throu...

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Abstract

The invention discloses a sub-wavelength waveguide-based narrow-band terahertz wave generator and a detection method thereof, wherein the high-efficient excitation problem of terahertz waves through the collinear phase matching process in the prior art can be solved. According to the technical scheme of the invention, sub-wavelength waveguide ferroelectric materials are adopted as a terahertz wave radiation source. The femto-laser pulse generated by a laser is focused to the side surface of a sub-wavelength waveguide. Through the impact stimulated raman scattering process, terahertz pulses are generated. Under the action of the sub-wavelength waveguide, the long-distance phase matching between terahertz waves of a specific wavelength and femtosecond lasers is realized, and narrow-band and amplified terahertz waves are generated. Through the phase-contrast imaging process, a terahertz time-domain transient spectrum is obtained. By utilizing the related calculation software arranged in a computer, the terahertz time-domain transient spectrum is subjected to fast fourier transformation so as to obtain an amplified narrow-band terahertz wave frequency spectrum. The generator is simple and easy to operate and control. Generated terahertz waves are narrow in band width and high in efficiency. Meanwhile, the detection sensitivity and the detection accuracy are improved.

Description

technical field [0001] The invention relates to the technical field of terahertz wave generation, in particular to a method for generating and detecting narrowband terahertz waves based on subwavelength waveguides. Background technique [0002] The frequency band of terahertz wave is between microwave and infrared, that is, 0.1THz to 10THz, and the corresponding wavelength is from 3 mm to 30 microns. Due to its special position in the electromagnetic spectrum, it has a series of special properties, such as: transient, low energy, penetrating, high bandwidth, and safety without harmful biological ionization, which makes terahertz Waves have broad application prospects in biomolecular monitoring, national defense security, medical diagnosis, non-destructive imaging, security inspection and other fields. The generation of narrow-band terahertz waves is particularly important for improving the detection sensitivity. [0003] At present, there are many methods to generate narro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 吴强杨慧梅卢瑶潘崇佩齐继伟张春玲姚江宏许京军
Owner NANKAI UNIV
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