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Short-period high-field-intensity coherent THz radiation source generation system

A technology with few cycles and radiation sources, applied in the field of terahertz light sources, it can solve the problems of difficult laser alignment and low conversion efficiency, and achieve the effects of short time scale, small spatial divergence angle, and reduced experimental difficulty.

Pending Publication Date: 2020-12-29
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, judging from the previous technology, in addition to the low conversion efficiency, there is also the problem that the laser is difficult to align, and it is necessary to find a new technical solution to solve it

Method used

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  • Short-period high-field-intensity coherent THz radiation source generation system

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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, a low-period high-field-strength coherent THz radiation source generation system includes an ultrashort pulse laser 100 and a vacuum target chamber system 101, and is characterized in that: the vacuum target chamber system 101 is provided with a supersonic nozzle system 102, a short A focal distance axial parabolic mirror 103, an off-axis parabolic mirror 104 and an optical path system, the ultrashort pulse laser 100 is connected to the short focal distance axial parabolic mirror 103, the short focal distance axial parabolic mirror 103 is connected to the supersonic nozzle system 102, and the supersonic nozzle system 102 is connected to The off-axis parabolic mirror 104 is connected with the optical path system.

[0039] As a preferred setting scheme, the few-period high-field-strength coherent THz radiation source generation system is provided with an ultrashort pulse laser 100 for generating laser light and a vacuum target chamber system 101...

Embodiment 2

[0042] This embodiment is further optimized on the basis of the above-mentioned embodiment, and it will not go into details here in connection with the aforementioned technical solution and the aforementioned technical solution, such as figure 1 As shown, further in order to better realize the present invention, the following arrangement is adopted in particular: the supersonic nozzle system 102 is placed in the center of the target chamber of the vacuum target chamber system 101, and the center height of the gas column ejected by the supersonic nozzle system 102 is It is at the same height as the center of the short focal length axial parabolic mirror 103 . The ultrashort pulse laser 100 adopts a mesa-type ultrashort pulse laser with a pulse width less than 30 femtoseconds and a single shot energy less than 1 Joule.

[0043] As a preferred setting scheme, the ultrashort pulse laser 100 adopts a mesa-type ultrashort pulse laser with a central wavelength of 0.8 microns, a peak ...

Embodiment 3

[0045] This embodiment is further optimized on the basis of any of the above-mentioned embodiments, and it will not go into details with the aforementioned technical solutions and the aforementioned technical solutions, such as figure 1 As shown, further in order to better realize the present invention, the following arrangement is particularly adopted: the optical path system includes a spectral beam splitter 105, a bandpass filter 106, a polarizer 107 and a pyroelectric THz detector 108, the The off-axis parabolic mirror 104 is sequentially connected to a spectral beam splitter 105 , a bandpass filter 106 , a polarizer 107 and a pyroelectric THz detector 108 .

[0046] In order to control the bandwidth of the output spectrum, a bandpass filter 106 is placed behind the spectral splitter 105. The preferred bandpass filter can be configured with different bandwidths as required, and different bandwidths can be selected by using different bandpass filters. After the bandpass fil...

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Abstract

The invention discloses a short-period high-field-intensity coherent THz radiation source generation system which comprises an ultrashort pulse laser (100) and a vacuum target chamber system (101), asupersonic nozzle system (102), a short-focus distance axis parabolic mirror (103), an off-axis parabolic mirror (104) and a light path system are arranged in the vacuum target chamber system (101), and the ultrashort pulse laser (100) is connected with the short-focus distance axis parabolic mirror (103). The short-focus distance axis parabolic mirror (103) is connected with the supersonic nozzlesystem (102), the supersonic nozzle system (102) is connected with the off-axis parabolic mirror (104), and the off-axis parabolic mirror (104) is connected with the light path system. A high-power THz radiation source is generated based on the interaction of femtosecond laser pulses and a supersonic jet target or air chamber.

Description

technical field [0001] The invention relates to the technical field of terahertz light sources, in particular to a system for generating coherent THz radiation sources with few periods and high field strength. Background technique [0002] Terahertz (T-ray) light sources are considered next-generation light sources, with applications ranging from cancer diagnosis to materials science. Due to its non-ionizing nature, good spatial resolution and ability to penetrate several millimeters of biological tissue. T-rays are a suitable alternative to X-rays when it comes to cancer detection. In addition to biological imaging, powerful T-rays have many applications in materials science as a diagnostic tool, such as ultrafast spectroscopy. By focusing high-power T-rays to a spot size of millimeters, an electric field on the order of GV / m can be generated. This electric field can be used to study structural transitions in polar molecules. The associated transient magnetic fields on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/06
CPCH01S1/06
Inventor 王剑余同普刘德会罗嘉琪曾澝菡
Owner NEIJIANG NORMAL UNIV
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