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Apparatus for generating tunable narrow band terahertz band wave by optical difference frequency

A terahertz, narrow-band technology, applied in the field of devices that generate terahertz waves, can solve problems such as backwardness, and achieve the effects of simple and compact structure, easy operation and debugging, and improved output stability

Inactive Publication Date: 2008-12-17
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The position of terahertz is just between microwave and millimeter wave and infrared optics, which are relatively well developed in science and technology. However, because the problem of THz wave source has not been well resolved, a relatively backward "blank" has been formed in research.
Therefore, optical THz radiation source technology is the main development direction of THz radiation generation at present, but there is still no specific device that uses optical methods to generate THz radiation at home and abroad.

Method used

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  • Apparatus for generating tunable narrow band terahertz band wave by optical difference frequency
  • Apparatus for generating tunable narrow band terahertz band wave by optical difference frequency
  • Apparatus for generating tunable narrow band terahertz band wave by optical difference frequency

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Embodiment Construction

[0029] see figure 1 , when the frequency is ω p The strong pump light and frequency ω i When the small-signal idler light is incident on the second-order nonlinear optical medium at the same time, three-wave mixing will occur in the medium, resulting in a frequency ω T (=ω p -ω i ) signal wave output, while the incident light energy is transferred from the pumping light to the idler light and the signal wave. The energy and momentum conservation conditions must be satisfied during this process:

[0030] ω p = ω T +ω i (1)

[0031]

[0032] Among them,|k m |=2πn m / λ m (m=P, T, i), n m is the refractive index of the nonlinear crystal. (2) is also called the phase matching condition. For anisotropic media, phase matching can be achieved by angle tuning or temperature tuning.

[0033] Take GaSe crystal as an example: the GaSe crystal is cut according to the collinear phase matching type of o-e=e. The pumping light is ordinary light polarization (o light), a...

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Abstract

The invention relates to a device for generating terahertz waves, in particular to a device for generating tunable narrowband terahertz waves by using optical difference frequency. The device comprises a pumping light source, an idler frequency light source, a nonlinear crystal and a controller. The nonlinear crystal is arranged on the light path of the co-linear beam emitted by the pumping light source and the idler frequency light source. The controller is connected with the idler frequency light source and the nonlinear crystal respectively. In order to solve the technical problem of generating THz radiation by using optical means in the background technology, the invention provides the device for generating tunable narrowband terahertz waves by using optical difference frequency. The device with simple and compact structure is operated and debugged easily. The narrowband THz waves are output quickly and continuously, and are tunable; and the output stability of the THz waves is high.

Description

technical field [0001] The invention relates to a device for generating terahertz waves, in particular to a device for generating tunable narrow-band terahertz waves by using optical difference frequency. Background technique [0002] A terahertz wave (Tera-Hertz Wave, THz wave) refers to an electromagnetic wave with a frequency in the range of 0.1-10 THz. It is a transition area between photonics technology and electronic technology, macroscopic and microscopic, and an electromagnetic radiation area that has scientific research value but has not yet been developed. It coincides with millimeter waves and submillimeter waves in the long wave band, and coincides with infrared rays in the short wave band, occupying a very special position in the electromagnetic spectrum. The position of terahertz is just between microwave and millimeter wave and infrared optics, which are relatively well developed in science and technology. However, because the problem of THz wave source has n...

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Application Information

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IPC IPC(8): G02F1/35G02F1/39G02F1/355
Inventor 刘红军马云振
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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