Terahertz spectrum detection system and method

Abstract

The invention provides a terahertz spectrum detection system and an application method thereof. The terahertz spectrum detection system comprises a modulation module, a mode selection module, a detection optical path and a detection module, and is characterized in that the modulation module is used for coupling DC bias signals and radio frequency signals, the mode selection module performs single longitudinal mode signal output on the coupled modulated signals, the detection optical path performs optical path transmission on the single longitudinal mode signals, the detection module determines the response of a specific frequency point in the THz spectrum for the signals transmitted by the detection optical path and displaying the response, the modulation module outputs signals to the mode selection module, and the mode selection module is sequentially connected with the detection optical path and the detection module through an optical path; and the mode selection mode and the modulation module are controlled by the detection module. According to the invention, a THz QCL (Terahertz Quantum Cascade Laser) is taken as a spectrum light source, and direct sampling is performed on an broadened THz laser spectrum by adopting an external cavity technology and a non-coherent detection technology, so that a signal synchronous sampling mechanism is saved, the spectrum reconstruction speed is high, and remote THz spectrum detection in an open environment is achieved.

Description

technical field [0001] The invention relates to the field of optical application technology, in particular, the invention relates to a terahertz spectrum detection system and detection method. Background technique [0002] In recent years, with the development of terahertz sources and detectors, various terahertz (Tera Hertz, THz) technologies are becoming more and more perfect. Among them, the research on terahertz wave spectroscopy technology and its applications has attracted the attention of many scientists. Attention, THz spectroscopy technology has also become a research hotspot and focus in the field of spectroscopy. [0003] The birth and development of THz spectroscopy technology has filled the "THz gap" in the field of spectroscopy very well, and it has unique features: (1) THz spectroscopy technology belongs to the category of infrared spectroscopy, but its function is different from that of infrared spectroscopy. The characteristics of THz spectroscopy It is mai...

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Problems solved by technology

[0005] In order to solve the problems that the existing THz spectrum detection system is complex, expensive and inconvenient to use, the inventor co

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