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
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[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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