Fourier phase grating terahertz wave beam splitter

A Fourier and phase grating technology, applied in the field of Fourier phase grating terahertz beam splitter, can solve the problems of high system cost, increased optical path complexity, and increased number of devices, achieving high diffraction efficiency and simple structure Reliable, Reduced Complexity and Cost Effects

Inactive Publication Date: 2020-04-03
SOUTHEAST UNIV
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  • Claims
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Problems solved by technology

[0005] Purpose of the invention: In view of the existing two-dimensional Fourier phase grating method for obtaining 4×4 sources, the number of devices used is doubled, the complexity of the optical path is increased, and the system cost is high. The present invention proposes a Fourier phase grating Grid terahertz beam splitter

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  • Fourier phase grating terahertz wave beam splitter
  • Fourier phase grating terahertz wave beam splitter
  • Fourier phase grating terahertz wave beam splitter

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Embodiment 1

[0026] refer to figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 , this embodiment provides a Fourier phase grating terahertz beam splitter, the Fourier phase grating terahertz beam splitter includes a two-dimensional Fourier phase grating 1, a support frame 2, and a rotating table 3 , disc 4, base 5, height adjustment knob 6 and rotating shaft 7. The middle part of the two-dimensional Fourier phase grating 1 is provided with a periodic structure 9 that regulates the wavefront phase, and the periodic structure 9 is provided with 5×5 periodic units. A circular hole 11 is opened in the middle of the lower end of the support frame 2, and the four corners of the two-dimensional Fourier phase grating 1 are respectively fixed on the support frame 2 by a detachable screw 8, thereby realizing Fourier phase gratings with different functions and frequency bands. real-time replacement. Specifically, the periodic structure 9 can be characterized by a phase function, specifi...

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Abstract

The invention discloses a Fourier phase grating terahertz wave beam splitter. The splitter comprises a two-dimensional Fourier phase grid, a support frame, a rotating table, a disc, a base, a height adjusting knob and a rotating shaft, the four corners of the two-dimensional Fourier phase grid are fixed to the support frame through screws, the lower end of the support frame is fixed to the rotating table through position pins, the rotating table is fixed to the upper end of the disc through a height adjusting knob and a height adjusting insertion hole, and the disc is fixed to the upper end ofthe base through a metal column and a fixing hole. The upper end of the rotating shaft sequentially penetrates through the through hole in the middle of the disc and the through hole in the middle ofthe rotating table to match the round hole in the middle of the lower end of the supporting frame. On the premise that high diffraction efficiency is guaranteed, the beam splitter is simple in structure, the angle and the height can be adjusted, and the complexity and the cost of a system suitable for the beam splitter are reduced.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a Fourier phase grating terahertz beam splitter. Background technique [0002] When the terahertz source is relatively scarce, it is particularly important to use quasi-optical technology to split the terahertz source in space to meet the demand for multiple local oscillator sources at the mixing end of the multi-channel superheterodyne receiver. The phase gratings that can realize sixteen equal beams and are arranged in a 4×4 array include Dammann gratings and two-dimensional Fourier phase gratings. [0003] The two-dimensional Fourier phase grating is composed of multiple periodic units. The phase function of each unit surface can be represented by a finite number of Fourier series. By controlling the size of the Fourier coefficients, the target diffraction order can be enhanced and other The purpose of the diffraction order is to obtain multiple diffracted beams of equal am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/44G02B27/10
CPCG02B27/10G02B27/44
Inventor 杨非彭双王昆颜立炜
Owner SOUTHEAST UNIV
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