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

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...

AI Technical Summary

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

Images