Terahertz quantum cascade laser optical beat note signal detection system and method

Abstract

The invention provides a terahertz quantum cascade laser optical beat note signal detection system and method. The detection system includes: a terahertz quantum well detector which is intended for detecting a terahertz multi-mode laser ray which is transmitted by the terahertz quantum cascade laser and an optical beat note signal, and converting the converting the optical beat note signal to an electrical signal; an off-axis polished mirror group which is intended for converging terahertz multi-mode laser rays which are generated by the laser and guiding the terahertz multi-mode laser rays to the terahertz quantum well detector; a detector DC source which is intended for outputting a DC to the terahertz quantum well detector; a T-type bias tee which is intended for providing DC bias output by the detector DC source to the terahertz quantum well detector and coupling the optical beat note signal which is detected by the detector; an amplifier which is intended for amplifying the optical beat note signal which is coupled by the T-type bias tee; and a high-frequency detection apparatus which is intended for acquiring spectral characteristics of the optical beat note signal. According to the invention, the system can effectively represent the spectral characteristics of the terahertz quantum cascade laser optical beat note signal.

Description

technical field [0001] The invention belongs to the technical field of application of semiconductor optoelectronic devices, and in particular relates to a detection system and method for an optical beat frequency signal of a terahertz quantum cascade laser based on a terahertz quantum well detector. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with frequencies ranging from 100GHz to 10THz and corresponding wavelengths ranging from 3mm to 3um, between millimeter waves and infrared light. From the perspective of physics, THz waves are in the transition zone from electronics to photonics; from the perspective of frequency domain, THz waves cover the characteristic energies of semiconductors and plasmas, and the rotation and vibration energies of organic and biological macromolecules, about 50% Photon energy in the universe, etc.; from the application point of view, THz wave frequency bandwidth, high measurement signal-to-noise ratio, suitab...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a THz quantum cascade laser optical beat signal detection system and method based on a THz quantum well detector, which is used to solve the problems that cannot be effectively achieved in the prior art. Problems in Characterizing Optical Beat Signals of Terahertz Quantum Cascade Lasers

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