Terahertz pulse intensity device

A technology of terahertz pulse and intensity, applied in the field of terahertz technology, can solve problems such as the decline of terahertz wave efficiency, and achieve the effect of wide application range and simple device structure

Active Publication Date: 2014-06-18
UNIV OF SHANGHAI FOR SCI & TECH +1
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Problems solved by technology

[0005] The present invention is aimed at the current method of exciting air plasma to generate terahertz waves based on a two-color field light source, which cannot solve the problem that the efficiency of terahertz wave generation decreases due to the phase mismatch of the two-color field light source propagating in the plasma, and proposes a met

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Embodiment Construction

[0011] Such as figure 1 The schematic diagram of the device structure of the terahertz pulse intensity is shown. The device includes a femtosecond laser 1, a focusing lens 2, a frequency doubling crystal 3, a vacuum chamber entrance window 4, a gas nozzle group 5, a vacuum chamber exit window 6, a vacuum chamber 7, Gas pipeline 8, vacuum pump 9 and terahertz detection system 10. The pump laser light emitted from the femtosecond laser 1 passes through the focusing lens 2 and the frequency doubling crystal 3 in turn to form a two-color field light source. The two-color field light source enters the vacuum chamber 7 after passing through the vacuum chamber incident window 4, and is focused in the vacuum chamber 7. Plasma drawing is formed near the focal point of the focusing lens 2, the gas inlet of the gas pipeline 8 is placed outside the vacuum chamber 7, and the gas outlet of the gas pipeline 8 communicates with the variable-structure gas nozzle group 5 placed in the vacuum ch...

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Abstract

The invention relates to a terahertz pulse intensity device. Pumping laser which exits from a femtosecond laser sequentially passes through a focusing lens and frequency doubling crystal and then forms a two-color field light source, the two-color field light source passes through a vacuum chamber entrance window and then enters a vacuum pump, a gas spray nozzle group continuously and stably feeds gas to generate unevenly distributed gas targets at a position that the two-color field light source is focused for plasma drawing after the vacuum pump is vacuumized, and the density distribution of the gas targets can be controlled by adjusting gas type and the structure and the parameters of the gas spray nozzles, so that the electron density distribution of the plasma can be changed, the phase matching situation of the two-color light source during the plasma drawing is adjusted and the intensity maximization of generated terahertz pulses is realized. Besides, the gas which is fed by the gas spray nozzle group can be any gas or combination of various gases which enter from different pipes, adjustment can be made anytime according to the parameters of a laser light source used in experiments and the drawing state of generated plasmas, the structure of the device is simple and the application scope is wide.

Description

technical field [0001] The invention relates to a terahertz technology, in particular to a device for optimizing the intensity of a terahertz pulse by controlling the structure of a gas nozzle group. Background technique [0002] Terahertz wave is an electromagnetic wave with a frequency in the range of 0.1 to 10 THz (wavelength in the range of 0.03 to 3 mm), which coincides with millimeter waves (submillimeter waves) in the long wave band, and coincides with infrared rays in the short wave band. occupies a very special place. Terahertz waves have many unique advantages, including low photon energy, no harmful photoionization to biological tissues, and many organic molecules have strong absorption and dispersion in this band, which can be used to identify organic molecules. Terahertz technology is an application of the unique advantages of terahertz, which involves the generation, propagation, control and detection of terahertz waves. A very attractive opportunity. [000...

Claims

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Application Information

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IPC IPC(8): H01S1/02
Inventor 彭滟朱亦鸣方丹罗坤陈向前周云燕钟宇郑书琦庄松林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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