Shaping method of difference frequency terahertz pulse and shaping system thereof

A terahertz pulse and difference frequency technology, applied in the terahertz field, can solve the problem that the terahertz pulse shaping method cannot realize the polarization direction modulation of the terahertz electric field.

Inactive Publication Date: 2010-08-04
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the technical problem that the existing terahertz pulse shaping method cannot realize the polarization direction modulation of the terahertz electric field, the present invention provides a terahertz pulse shaping method based on difference frequency

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  • Shaping method of difference frequency terahertz pulse and shaping system thereof
  • Shaping method of difference frequency terahertz pulse and shaping system thereof
  • Shaping method of difference frequency terahertz pulse and shaping system thereof

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Embodiment Construction

[0023] The present invention is described in detail below in conjunction with accompanying drawing and concrete shaping step:

[0024] The structure of the difference frequency terahertz pulse shaping system of the present invention is as follows figure 2 It can be seen from the figure that. The laser pulse emitted from the femtosecond laser is divided into two polarized laser beams by the first polarization beam splitter PBS I, one column is used as pump light, and the other column is used as probe light. The pump light is divided into two columns by the second polarizing beam splitter PBS II. The first column of pump light 1 directly enters the laser pulse space-time transformation and shaping device 1, and the second column of pump light 2 is reflected by the total mirror and enters the laser. Pulse space-time transformation and shaping device 2, two columns of pump light are generated in the laser pulse space-time transformation and shaping device 1 and 2 to generate las...

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Abstract

The invention discloses a shaping method of a difference frequency terahertz pulse and a shaping system thereof. In the shaping method, a laser pulse shaping device is used for realizing the programmable shaping of a laser pulse; two arrays of laser pulses passing through the converting and shaping device are regulated to be mutually vertical in polarization directions and then are overlaid in a non-linear crystal and subjected to difference frequency to generate a terahertz wave; and through controlling the wave forms and the phases of the two arrays of the laser pulses with mutually vertical polarization directions, the wave form and the electric field polarization direction of the generated terahertz pulse can be controlled and the wave form and the polarization direction of generated terahertz radiation can be detected. The invention not only can control the wave form and the pulse interval of the terahertz pulse, but also can control the electric field polarization direction of the terahertz pulse. Compared with a scheme for shaping the terahertz pulse by using a photoconductive antenna or through an optical rectification process, the invention has obvious advantages.

Description

technical field [0001] The invention belongs to the technical field of terahertz, controls the terahertz waveform based on the optical difference frequency process, and generates the required terahertz pulse sequence through the pulse shaping technology. Background technique [0002] At present, there are mainly three methods for generating terahertz pulses with arbitrary controllable waveforms: 1. Directly generate terahertz pulses with arbitrary waveforms, but so far, there is no device that can generate terahertz pulses with arbitrary waveforms as required. 2. Design the photoconductive antenna in the form of an array according to the waveform of the required terahertz pulse, and apply different bias voltages to each photoconductive antenna according to the waveform control requirements to control the spatial distribution of the photocurrent of the photoconductive antenna, so as to control the generated by superposition The waveform of the terahertz radiation, but using t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10
Inventor 李德华周薇徐世林田有良
Owner SHANDONG UNIV OF SCI & TECH
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