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System and method for generating terahertz waves through circular Airy three-color field laser

A terahertz and laser technology, applied in the field of terahertz waves and femtosecond lasers, can solve the problems of terahertz waves, reduce peak energy, self-diffraction, etc., and achieve the effects of large radiation intensity, strong energy, and wide spectrum

Active Publication Date: 2022-04-22
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

In addition, the femtosecond lasers used in current research are generally Gaussian lasers, whether it is two-color field or three-color field pumping lasers, and Gaussian lasers will undergo self-diffraction during propagation, thereby reducing their focus. peak energy, and this parameter has a direct impact on the generation of terahertz waves

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  • System and method for generating terahertz waves through circular Airy three-color field laser

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[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0032] Both experiments and theory have confirmed that the three-color field laser can produce stronger terahertz radiation compared with the traditional two-color field laser structure, increase its terahertz conversion efficiency, and also have a modulation effect on the terahertz spectral distribution and central frequency shift, which can For applications with specific terahertz spectrum distribution or spectrum changes (reference: D.Ma ​​et al.Enhancement ...

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Abstract

The invention discloses a system and a method for generating terahertz waves by circular Airy three-color field laser. The system comprises a laser, a first spectroscope, an optical parametric amplifier, a first reflector, a first reflective spatial light modulator, a half-wave plate, a first focusing lens, a BBO crystal, a first off-axis parabolic mirror, a second spectroscope, a second reflector, a second reflective spatial light modulator and a third reflector which are sequentially arranged on a light path. Two beams of laser are converted into circular Airy beams from Gaussian beams through the two reflective spatial light modulators suitable for different wavelengths, and then third-frequency laser is generated through the BBO crystal. And the circular Airy three-color field laser is focused at one point to excite the air plasma to generate terahertz waves. The terahertz wave energy generated by the device is relatively strong, the spectrum is relatively wide, terahertz radiation source application and spectral measurement are facilitated, and the device has relatively strong scientific research and practical application values.

Description

technical field [0001] The present invention relates to the technical fields of terahertz waves and femtosecond lasers, in particular, to a system and method for generating terahertz waves with a circular Airy three-color field laser, and more specifically to a circular Airy three-color field laser beam focusing air Systems and methods for filamentary generation of terahertz waves. Background technique [0002] As the medium for generating terahertz waves, air has the advantages of no damage threshold and recyclable use, and the generated terahertz waves have short pulse width, high peak intensity (electric field strength up to 21MV / cm), and wide spectrum coverage (up to 200 THz), making the technology of focusing ultrashort laser pulses in the air to directly generate terahertz waves has received extensive attention in recent years. In previous studies, the single-color field or two-color field (fundamental frequency wave and its second harmonic) with a wavelength of 800nm...

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Application Information

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IPC IPC(8): H01S1/06G02B27/09
CPCH01S1/06G02B27/0927
Inventor 张亮亮马丹妮李岩杨舒月马奥琦罗奕洋张存林
Owner CAPITAL NORMAL UNIVERSITY
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