Continuous wave cavity ring-down spectroscopy device and method based on electromagnetically induced transparency effect

Abstract

The invention relates to a continuous wave cavity ring-down spectrum device and method based on an electromagnetic induction transparent effect. The device comprises a continuous wave semiconductor laser, wherein the continuous wave semiconductor laser is used as a light source of detecting light and control light; a front cavity mirror of an optical resonant cavity, a first polarization splitting prism, an electromagnetic induction transparent medium air chamber, a second polarization splitting prism, an air chamber of samples to be tested, a back cavity mirror of the optical resonant cavity and a photoelectric detector used for receiving a detecting optical signal are sequentially arranged on the optical path of the emergent detecting light. The electromagnetic induction transparent effect and the cavity ring-down spectrum technology are combined; the specific zero-absorption high-dispersion effect of the electromagnetic induction transparent effect is applied to the retarding of the speed of photons in the cavity; the photon service life is prolonged; the mutual acting time between the photons and the samples is increased, so that the cavity ring-down spectrum sensitivity is greatly improved. The device and the method have the characteristics that the structure is simple; the regulation is convenient and easy; the compatibility is good, and the like.

Description

technical field [0001] The invention belongs to continuous wave cavity ring-down spectroscopy technology, in particular to a continuous wave cavity ring-down spectroscopy device and method based on electromagnetic induced transparency effect, which can be used in precision measurement fields such as quantitative analysis of trace gas. Background technique [0002] Quantitative analysis of trace gases is very important in many fields, such as spectroscopy, chemical analysis, medical diagnosis, environmental monitoring and pollutant control in industrial production. For example, with the rapid development of semiconductor technology, the purity requirements of the gas required in the semiconductor production process have been continuously improved, and the maximum concentration of impurities has been reduced by more than four orders of magnitude. Ultra-high-purity gases play an extremely important role in the increasingly smaller geometric features required in semiconductor in...

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Problems solved by technology

However, this solution needs to change the traditional optical resonant cavity. Using a V-shaped cavity requires 3 cavity mirrors, which is difficult to build.

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