Pulse polarizing and shaping-based two-color field chevilled silk-induced terahertz field enhancement system

A technology for enhancing the system and terahertz detection, applied in optics, solid-state lasers, nonlinear optics, etc., can solve problems such as damaging antennas and hindering terahertz radiation

Active Publication Date: 2016-07-20
CHONGQING HUAPU INFORMATION TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these technologies have some defects more or less, for example, if the pump energy in the photoconductive antenna is too high, and the external DC electric field is too strong, the antenna will be damaged; The final pulse can no longer directly generate more terahertz photons, which limits the further improvement of terahertz radiation efficiency. The charge shielding effect caused by too high pump energy in the gas plasma will hinder the generation of terahertz radiation; Electrostatic field approach not applicable to terahertz field in atmospheric remote sensing

Method used

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  • Pulse polarizing and shaping-based two-color field chevilled silk-induced terahertz field enhancement system
  • Pulse polarizing and shaping-based two-color field chevilled silk-induced terahertz field enhancement system

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Embodiment

[0041] refer to figure 1 , figure 2 , this embodiment consists of a femtosecond pulse laser module 100, a laser pulse frequency doubling and beam splitting module 200, a pulse polarization shaping module 300, a pulse synchronization module 400, a terahertz radiation generation module 500, and a terahertz detection module 600. The femtosecond pulsed laser sequence from the Ti:Sapphire femtosecond pulsed laser or the Ytterbium-doped fiber femtosecond pulsed laser 101 is divided into pump light (strong) and probe light (weak) by a beam splitter 102 . The pump light is incident on the frequency doubling crystal 201 to generate a mixed beam of fundamental wave and second harmonic wave, which is then separated by the first dichroic mirror 202 with high transparency in the fundamental wave band and high reflection in the second harmonic wave band. The pulsed light of the second harmonic passes through the optical delay line (composed of three high-inversion plane mirrors 401, 402 a...

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Abstract

The invention provides a pulse polarizing and shaping-based two-color field chevilled silk-induced terahertz field enhancement system, which comprises a femtosecond pulse laser module, a laser pulse frequency doubling and beam splitting module, a pulse polarizing and shaping module, a pulse synchronization module, a terahertz radiation generation module and a terahertz detection module. Compared with a traditional femtosecond chevilled silk-induced terahertz wave generation method, the pulse polarizing and shaping-based two-color field chevilled silk-induced terahertz field enhancement system has the advantages that the system has a terahertz strength enhancement effect, the terahertz frequency spectrum can be effectively modulated and the system has potential value in applications of terahertz time-domain spectroscopy, terahertz imaging and atmosphere remote sensing.

Description

technical field [0001] The invention belongs to the field of terahertz wave generation, and mainly relates to a method for generating and controlling terahertz wave pulses by using femtosecond laser pulses. Background technique [0002] Terahertz waves are electromagnetic waves with a frequency between 0.1 and 10 THz (1 THz = 1012 Hz), which are located in the middle of the microwave and infrared bands of the electromagnetic spectrum. Terahertz wave is an interdisciplinary field of macroelectronics and microphotonics research. In addition to the wave-particle duality of electromagnetic waves, it also has low energy, coherence, transient, high penetration, spectral fingerprint characteristics, broadband Therefore, terahertz waves have great applications in the fields of cosmic background radiation, biomedical imaging, cancer detection, drug detection, explosive detection, nondestructive imaging, security inspection, wireless communication, etc. Research value and prospects. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02G02F1/35G02F1/37
CPCG02F1/35G02F1/37G02F2203/13G02F2203/26G02F2203/28H01S1/02
Inventor 南君义何泊衢曾和平
Owner CHONGQING HUAPU INFORMATION TECH CO LTD
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