Infrared gas detection technology based on quantum cascade laser

Owing to the need for the environment detection of the industrial control, the gas sensor system based on the principle of infrared absorption spectrum has attracted more and more attentions. It has been proved that the quantum cascade laser (QCL) which is a new-style laser based on the transition among subbands, has the different irradiancy theory compared with the traditional diode laser. In theory, the laser radiation wavelength of the QCL is well adjustable, so it is very promising in the application. This paper focuses on introducing the infrared gas detection technology, development, working principle and the applications of gas detection system based on the quantum cascade laser.