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Terahertz radiation source device

A terahertz radiation source and terahertz technology are applied in the direction of solid-state lasers to achieve high conversion efficiency, easy implementation, and compact structure

Inactive Publication Date: 2017-07-07
HUBEI JIUZHIYANG INFRARED SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that only partial directions of terahertz waves are coupled out in current Cerenkov terahertz radiation sources, and provides a new type of Cerenkov phase-matched terahertz radiation source device, which can generate high-power The terahertz wave can effectively output the terahertz wave generated in all directions into the space, and has the advantages of compact structure, high conversion efficiency and convenient use

Method used

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Examples

Experimental program
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Embodiment 1

[0033] refer to image 3 As shown, the electro-optic crystal 1 of this embodiment is made of lithium niobate doped with magnesium oxide, the doping concentration is 5mol%, the cutting direction is y-cut, and the size is 10mm×5mm×0.1mm; the incident surface of the crystal is coated with a pump laser anti-reflection film . The upper cladding layer 2 and the lower cladding layer 3 are PET films with a thickness of 5 μm; the pump laser is focused and collimated by a cylindrical mirror system into a linear spot and then incident into the lithium niobate crystal; the upper coupling prism 4 and the lower coupling prism 5 are Triangular prism, the material is high resistivity silicon, the plane part of the prism is polished, the angle θ h is 50°. The wavelength of the incident pump laser is 1560nm, the average power is 50mW, the pulse width is 60fs, and the spot diameter is 0.1mm after being focused and collimated by a cylindrical mirror.

[0034] The conversion efficiency of the t...

Embodiment 2

[0036] refer to Figure 4 As shown, it is improved on the basis of Embodiment 1, and the structural differences with Embodiment 1 are mainly:

[0037] First, the shape of the electro-optic crystal 1 is a cuboid, the pump laser incident surface is a square, the crystal size is 10mm×1mm×1mm, and the crystal is coated with a PET film with a thickness of 5 μm as a cladding except for the light-transmitting surface;

[0038] Second, the terahertz coupling prism 4 and the terahertz coupling prism 5 are semi-conical;

[0039] The conversion efficiency of the terahertz radiation source device can reach 0.1%, and the output terahertz waves are quasi-plane waves.

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Abstract

The invention discloses a terahertz radiation source device. The terahertz radiation source device comprises an electro-optical crystal, an upper coupling prism and a lower coupling prism, wherein the upper coupling prism and the lower coupling prism are closely attached onto an upper surface and a lower surface of the electro-optical crystal, the upper coupling prism or the lower coupling prism is made of a material with refraction index larger than that of the electro-optical crystal and transparent to a terahertz wave band, and a cladding layer with relatively small refraction index is coated on a non-transmitting surface of the electro-optical crystal. The cladding layer with refraction index lower than that of the electro-optical crystal covers the electro-optical crystal, thus, the power of pumping laser leaked to the outside is reduced, and the non-linear conversion efficiency is improved; the two terahertz coupling prisms are used for outputting terahertz waves, the transmission loss of terahertz on a surface of the electro-optical crystal is reduced, so that the generated terahertz waves can be completely coupled to a space; and the terahertz radiation source device has the advantages of compact structure, high conversion efficiency and wide spectrum range and is convenient to use, so that the terahertz radiation source device has wide application prospect in fields of non-destructive detection, material analysis, imaging and the like.

Description

technical field [0001] The invention relates to the field of terahertz wave generation, in particular to a Cerenkov phase matching terahertz radiation source device with high conversion efficiency, wide spectral range and compact structure. Background technique [0002] Terahertz waves refer to electromagnetic waves with frequencies ranging from 0.1 to 10 THz. Its many unique properties make it have broad application prospects in nondestructive testing, material analysis, imaging and other fields. Terahertz radiation source is one of the basic and key technologies of terahertz scientific research and engineering application, especially broadband terahertz radiation source, which plays a vital role in terahertz spectral analysis. [0003] Nonlinear optical frequency conversion methods such as femtosecond laser optical rectification technology are one of the effective ways to obtain broadband terahertz waves. At present, many electro-optic crystals have been used to generate ...

Claims

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Application Information

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IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 李长庚袁英豪郭良贤周正李超李渊熊波涛陈师雄郭劼姚远
Owner HUBEI JIUZHIYANG INFRARED SYST CO LTD