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Nonlinear coupling method for generating terahertz waves through cascade difference frequency

A nonlinear coupling, terahertz technology, applied in nonlinear optics, instruments, optics, etc., can solve problems such as lack of tuning, and achieve the effect of improving conversion efficiency, high power, and compact structure

Pending Publication Date: 2022-08-05
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

Restricted by phase matching conditions, the cascaded difference frequency method can only obtain terahertz waves of a single frequency and is not tunable

Method used

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  • Nonlinear coupling method for generating terahertz waves through cascade difference frequency
  • Nonlinear coupling method for generating terahertz waves through cascade difference frequency
  • Nonlinear coupling method for generating terahertz waves through cascade difference frequency

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Embodiment Construction

[0039] The nonlinear coupling method for generating terahertz waves by cascaded beat frequency of the present invention utilizes lithium niobate (LN) crystal cascade beat frequency to generate terahertz waves, and the specific steps are as follows:

[0040]Step 1: Select three laser beams incident on the LN crystal. The three laser beams include the first pump light, the second pump light and the signal light with different wavelengths. The parameters of the three laser beams are:

[0041] The wavelength of the signal light is λ 1 =1.064μm, the intensity is 400MW / cm 2 ;

[0042] The wavelength of the first pump light is λ p1 =2.7μm, the strength is 5GW / cm 2 ;

[0043] The wavelength of the second pump light is λ p2 =1.764μm, the strength is 250GW / cm 2 ;

[0044] Step 2: Analyze the coupled wave equation of the terahertz wave generated by the cascaded difference frequency of the three laser beams

[0045] The generation of terahertz waves by cascaded beat frequency incl...

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Abstract

The invention discloses a non-linear coupling method for generating terahertz waves by cascade difference frequency, which comprises the following steps: (1) selecting three beams of incident laser which comprise a first beam of pump light, a second beam of pump light and signal light with different wavelengths; (2) analyzing a coupling wave equation of terahertz waves generated by cascade difference frequency of the three laser beams; (3) a coupling modulation function is selected to modulate the coupling coefficient of the nonlinear crystal, a modulated adiabatic crystal is obtained, and the adiabatic crystal can meet the condition of nonlinear optical adiabatic frequency conversion from signal light to terahertz waves; and (4) realizing nonlinear optical adiabatic frequency conversion from the signal light to the terahertz wave through the adiabatic crystal obtained in the step (3). According to the invention, wide tuning terahertz wave output can be obtained while the conversion efficiency is improved.

Description

technical field [0001] The invention relates to a light source processing method, in particular to a nonlinear coupling method for cascading difference frequencies to generate terahertz waves. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz (wavelength in the range of 0.03-3mm). Due to its unique physical properties, it has important application prospects in the fields of medical imaging, non-destructive testing, security inspection systems, and wireless communications. The nonlinear optical difference frequency method is an effective method to obtain terahertz waves. The basic principle is that two pump lights with similar frequencies pass through the second-order nonlinear effect of the nonlinear medium, and when the phase matching conditions are met, a pump light with a frequency of Terahertz waves with the difference between the frequencies of the laser light. [0003] In 1965, Zernike et al. first ...

Claims

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Application Information

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IPC IPC(8): G02F1/35H01S1/02
CPCG02F1/353G02F1/3515H01S1/02
Inventor 陈长水张忠昊
Owner SOUTH CHINA NORMAL UNIVERSITY
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