Tera-hertz and infrared frequency band laser light source

A laser light source, terahertz technology, applied in the infrared band laser light source, terahertz field, can solve the problems of low quantum well sub-band transition efficiency, complicated preparation process, increased cost and price, etc., and achieves high electro-optical conversion efficiency and easy material growth. , the effect of low cost

Inactive Publication Date: 2011-11-09
TONGJI UNIV
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Problems solved by technology

The quantum well sub-band transition efficiency is relatively low, and the quantum cascade laser improves the external quantum efficiency and reduces the threshold current through the periodic repetition (usually up to dozens of times) of the active region and the implanted region
Each periodic unit is

Method used

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  • Tera-hertz and infrared frequency band laser light source
  • Tera-hertz and infrared frequency band laser light source
  • Tera-hertz and infrared frequency band laser light source

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0025] Figure 1A It is a schematic structural diagram of the first embodiment of the terahertz and infrared laser light source of the present invention. The first embodiment of the present invention is composed of a planar metal structure layer 1, a semiconductor active layer 2 and a metal base layer 3 stacked in sequence. The metal structure of the planar metal layer 1 is a one-dimensional periodic arrangement of metal strips. Figure 1B is a schematic diagram of its structure. The metal strip width is 5.9 microns, and the air gap between the metal strips is 0.2 microns. The entire planar metal structure layer 1 is a planar structure, which is easy to process. The metal base layer 3 serves as the supporting layer of the whole structure with a thickness of 100 microns, which can be designed according to actual applications to meet the needs ...

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Abstract

The invention discloses a tera-hertz and infrared frequency band laser light source, which comprises a planar metal structure layer, a semiconductor active layer and a metal bottom plate layer, wherein the metal bottom plate layer is a support layer; the semiconductor active layer and the planar metal structure layer are overlapped on the metal bottom plate layer in sequence to form a coherent surface state; and the planar metal structure layer consists of one-dimensional or two-dimensional periodically-arranged metal units or metal gratings with concentric ring structures. The coherent surface state is coupled with external plane waves through a metal gap of the planar metal structure layer and is radiated to a free space, and the ratio of the metal gap of the planar metal structure layer to a unit cycle length is in an inverse relation with a coupling coefficient, so that the electromagnetic field intensity of the semiconductor active layer is amplified, and quantum number reversion is realized to generate lasing. The laser light source disclosed by the invention has a wide frequency band, high light power and a simple structure and is convenient to manufacture.

Description

technical field [0001] The invention relates to a laser light source for terahertz and infrared frequency bands. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency range of 0.1-10 THz. The terahertz spectrum of matter contains rich physical and chemical information, and has broad application prospects in the fields of physics, chemistry, biomedicine, space communication, and military applications. Infrared frequency band refers to electromagnetic waves with frequencies between visible light and terahertz bands. Infrared spectroscopy has a wide range of applications, provides a lot of information and is characteristic, and can be applied to the analysis of the chemical composition of substances. It is not limited by melting point, boiling point and vapor pressure, and the amount of sample used is small and recyclable, which belongs to non-destructive analysis. It has become the most commonly used and indispensable tool in modern st...

Claims

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Application Information

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IPC IPC(8): H01S5/18H01S5/34
Inventor 魏泽勇李宏强曹扬武超樊元成余兴韩缙张冶文陈鸿
Owner TONGJI UNIV
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