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Terahertz strong-field system of ultrashort pulse pump based on wave tilting method

An ultrashort pulse, terahertz technology, applied in the field of terahertz strong field time-domain spectroscopy, can solve problems affecting the generation efficiency of terahertz waves

Active Publication Date: 2017-12-01
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

The reflection and absorption of pump light by optical components in the imaging system will affect the final input of LiNbO 3 The pump light energy in the crystal affects the efficiency of terahertz wave generation

Method used

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  • Terahertz strong-field system of ultrashort pulse pump based on wave tilting method

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specific Embodiment approach

[0046] 1. An ultrashort pulse pumped terahertz strong field system based on the wavefront tilt method is composed of the following 13 devices: convex lens 1, concave lens 2, plane mirrors 3-a, 3-b, grating 4, 1 / 2 Wave plate 5, cylindrical mirrors 6-a, 6-b, LiNbO 3 Crystal 7, off-axis parabolic mirrors 8-a, 8-b, 8-c, 8-d, 8-e, terahertz linear polarizers 9-a, 9-b, mechanical delay line 10, thin film beam splitter 11, detection crystal 12, photoelectric balance detection module 13.

[0047] 2. The horizontally polarized 800nm ​​space-free laser I is incident along the optical axis to the telescopic beam reduction system composed of the convex lens 1 and the concave lens 2, and the laser spot is reduced according to the focal length ratio of the convex lens 1 and the concave lens 2.

[0048] 3. The narrowed laser beam I is incident on the reticle with a density of 2000mm by the plane reflector 3-a at an incident angle of 59.8° -1On the grating 4, the diffracted light exits at a...

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Abstract

The invention relates to a terahertz strong-field time-domain spectrum. High-pulse-energy terahertz wave is efficiently produced for designing an appropriate wave tilting imaging system, and the system has strong scientific research and practical application values. According to the technical scheme adopted by the invention, a terahertz strong-field system of an ultrashort pulse pump based on a wave tilting method is composed of the following components: a convex lens, a concave lens, a plane reflection mirror, a grating, a 1 / 2 wave plate, 2 cylindrical reflecting mirrors, LiNbO3 crystals, 5 off-axis parabolic mirrors, 2 terahertz linear polarizers, a mechanical delay line, a thin film beam splitter, a detection crystal, a photoelectric balance detection module and a laser light source; the components are arranged on an optical platform, wherein the convex lens and the concave lens are combined to form a telescope system, the rear focuses of the convex lens and the concave lens are coincided, and the amplitude of a light beam I emitted by the laser light source is reduced according to focal length ratio of the two lenses. The terahertz strong-field system provided by the invention is mainly applied to a wave tilting imaging occasion.

Description

technical field [0001] The present invention relates to terahertz strong-field time-domain spectroscopy, in particular, to a terahertz strong-field system pumped by ultrashort pulses based on a wavefront tilt method. Background technique [0002] Terahertz waves are located between infrared and microwaves in the electromagnetic spectrum, and generally refer to electromagnetic waves with a frequency of 0.1-10THz. In recent years, terahertz-related technologies have been widely concerned and developed rapidly. Due to its special spectral position and physical properties, it has great application potential in national defense, security inspection, biomedicine, and physics. There are many types of terahertz sources, including broad spectrum (pulse type) and narrow spectrum (continuous type), and the output power can reach kilowatts [1] , single pulse energy up to 100 microjoules [2] , the peak electric field strength can reach megavolts per centimeter [3-5] . [0003] In a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3581
CPCG01N21/3581
Inventor 李绍限苏晓强欧阳春梅田震谷建强张学迁何明霞韩家广张伟力
Owner TIANJIN UNIV
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