Angle tuning-free THz collinear difference frequency radiation system based on cadmium telluride

A cadmium telluride, collinear technology, applied in the field of terahertz radiation measurement, can solve the problems of high operation difficulty, unfavorable large-scale application, poor system stability, etc., to reduce operation difficulty, improve system stability, and improve system stability and performance. Effect

Inactive Publication Date: 2012-07-11
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] Aiming at the disadvantages of the current nanosecond laser difference frequency terahertz radiation system, such as poor system stability, high operational difficulty, and unfavorable practical large-scale application, the present invention proposes the use of nonlinear optical collinear difference frequency principle and quasi-phase matching technology, in An angle-free tunable t

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  • Angle tuning-free THz collinear difference frequency radiation system based on cadmium telluride
  • Angle tuning-free THz collinear difference frequency radiation system based on cadmium telluride
  • Angle tuning-free THz collinear difference frequency radiation system based on cadmium telluride

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[0029] Below in conjunction with accompanying drawing, the present invention is further described in detail:

[0030] figure 1It is a schematic diagram of the system structure of this patent, and the specific optical components used are as follows: main pump laser source 1, tunable laser source 2, optical delay line 3, optical half-wave plate 4, optical polarizer 5, optical half-wave plate 6, optical polarizer Sheet 7, laser high reflection mirror 8, polarizing beam splitter 9, aperture stop 10, cadmium telluride crystal 11. The specific implementation process is as follows: First, the pulsed pump laser beam with a wavelength of 1064nm emitted from the main pump laser source 1 passes through the optical delay line 3, the optical half-wave plate 4, and the optical polarizer 5 in sequence, and then enters the beam splitting polarized light along the horizontal polarization In the mirror 9, the near-monochromatic 1064nm band pulsed idler laser beam emitted from the tunable laser...

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Abstract

The invention discloses an angle tuning-free nanosecond laser collinear difference frequency THz radiation system based on cadmium telluride crystals. The system can achieve THz light radiation without angle tuning by particularly using the principle of nonlinear optical collinear difference frequency and quasi-phase matching technology, and the wavelength tuning range of the system is 0.80THz to 2.74THz. The system not only has the characteristics of high power, quasi-continuity, narrow line width, room temperature operation and so on, but also has the advantages of convenient wavelength tuning by only tuning the output wavelength of a tunable laser, high easiness in adding an external infrared resonant cavity, compact structure, easy construction, high system stability, high convenience for actual large-scale application and so on in comparison with a radiation system using birefringent crystals as THz crystals and a parametric oscillation source based on lithium niobate crystals.

Description

technical field [0001] The invention relates to the field of terahertz radiation measurement, in particular to a terahertz wave collinear difference frequency radiation system without angle tuning. Background technique [0002] Terahertz waves (0.1-10THz), whose electromagnetic spectrum is between microwave and infrared, have a series of unique properties. Acoustic phonons and optical phonons in solids, defect states and impurity state energy levels in semiconductors, and subband transition energies in superlattice semiconductors are all concentrated in this wavelength range. Known as one of the top ten science and technology changes in the 21st century, terahertz science and technology have or will provide communication, radar, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, non-destructive testing, security inspection, military anti-terrorism, biochemical , materials science and other fields have brought a wide range of applications and fa...

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Application Information

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IPC IPC(8): H01S1/02G02F1/35
Inventor 黄敬国黄志明陆金星童劲超褚君浩
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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