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Multifunctional terahertz time-domain spectral imaging device based on femtosecond laser

A terahertz time-domain, femtosecond laser technology is applied in the field of multi-functional terahertz time-domain spectral imaging devices, which can solve the problems of lack of high-power terahertz radiation sources, limited spatial resolution diffraction limit, and low signal-to-noise ratio. , to achieve the effect of breaking the diffraction limit, improving flexibility and stability, and low cost

Inactive Publication Date: 2017-12-12
TIANJIN UNIV
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Problems solved by technology

The limitations of the device are: the signal-to-noise ratio depends on the intensity of the terahertz wave and the absorption rate of the sample to the terahertz wave, lack of a high-power terahertz radiation source, and the signal-to-noise ratio is lower
Most of the terahertz spectral imaging devices developed so far are similar to the point-by-point scanning devices proposed by Hu and Nuss. The terahertz optical path is fixed, the structure is complex, and the spatial resolution is limited by the diffraction limit. Scanning imaging can only be achieved by moving the sample in two dimensions. the goal of

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  • Multifunctional terahertz time-domain spectral imaging device based on femtosecond laser
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  • Multifunctional terahertz time-domain spectral imaging device based on femtosecond laser

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Embodiment Construction

[0039] The invention is a terahertz pulse imaging device, which utilizes terahertz spectral imaging technology to perform imaging in a point-by-point scanning manner, and the image information obtained through the invention includes amplitude information and phase information at the same time.

[0040] In the terahertz pulse imaging technology, the terahertz time-domain spectral imaging technology is the earliest and most mature technology. Its notable features are high signal-to-noise ratio and large amount of information. Each pixel corresponds to a time-domain imaging technology. Waveform, the amplitude and phase of each pixel can be obtained through Fourier transform, so that the two-dimensional distribution map of the dielectric properties of the sample can be reconstructed. Since many materials have fingerprints in the terahertz band, imaging of characteristic frequencies can be used to identify the material distribution of the sample. Most of the terahertz spectral imag...

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Abstract

The invention relates to terahertz pulse imaging, and provides a high-performance terahertz time-domain spectral imaging device. The terahertz time-domain spectral imaging device has the advantages of simplicity, easiness in adjustment, high stability, high signal to noise ratio, wide broadband, high speed, flexibility, convenience, rapidness and high space resolution ratio. The multifunctional terahertz time-domain spectral imaging device based on femtosecond laser comprises an optical fiber femtosecond laser device, an optical fiber, an optical fiber beam splitter, an optical fiber delay line, an optical fiber integrated terahertz transmitting antenna, a COC terahertz lens, an optical fiber collimator, a frequency multiplication module, a lens, a reflector, a terahertz probe, a two-directional electric detection translation stage, a three-dimensional electric sample frame, a square-wave voltage source, a current amplifier, a phase-locked amplifier, a data collection card and a computer. The terahertz time-domain spectral imaging device is mainly applied to terahertz pulse imaging.

Description

technical field [0001] The present invention relates to terahertz pulse imaging, in particular to a femtosecond laser-based multifunctional terahertz time-domain spectral imaging device. Background technique [0002] Terahertz waves are located between infrared and microwave 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. It has great application potential in national defense, security inspection, biomedicine, physics, etc. Terahertz imaging technology is one of the most promising development directions in terahertz science and technology. The performance parameters of imaging devices include bandwidth, spatial resolution, signal-to-noise ratio, whether phase information can be collected, imaging speed, flexibility, Stability, etc. These performance parameters directly determine the application range of terahertz imag...

Claims

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Application Information

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IPC IPC(8): G01N21/3586
Inventor 许悦红张慧芳张学迁田震谷建强欧阳春梅韩家广张伟力
Owner TIANJIN UNIV
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