All-fiber coupling type terahertz near-field probe spectral imaging system
In order to develop an all-fiber-coupled terahertz near-field probe spectroscopy imaging system,an all-fiber-coupled terahertz photoconductive probe antenna and a femtosecond multiplier optical path were fiber modularly packaged and combined with a fiber-coupled terahertz photoconductive antenna radiation source,as well as an independently developed and designed fiber-optic femtosecond laser light source and fiber-based high-speed optical delay line.The all-fiber-coupled terahertz near-field probe spectroscopic imaging system with a dynamic range of 60 dB,a spectral sampling speed of up to 0.1 sec/spectra and a near-field imaging resolution better than 20 μm was reported for the first time.Benefit from the all-fiber structure design of the entire system,the terahertz radiation source and the probe detector can be flexibly adjusted according to the measurement needs without recalibrating the optical path.The working stability and the use convenience of the system are greatly improved.The research results of this work provide a high-performance and practical terahertz near-field spectral imaging measurement system for terahertz scientific research.
terahertz near fieldphotoconductive antenna probeterahertz time-domain spectroscopy
万方数据
维普
