Abstract
To develop and make use of tunable Terahertz(THz) sources with high power,high efficiency and operating in room temperature,this paper researches and analyzes the progress in THz sources by photonics methods,including optically pumped THz lasers,air plasma THz sources,photoconductive antennas and the optical rectification,difference frequency generation,THz parametric generation based on nonlinear optical process.The numerous challenges and key technologies of this THz generation method are also proposed.
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