Ultrahigh-sensitivity medium-long-wave infrared imaging method and system operating at normal temperature

Abstract

The invention provides an ultrahigh-sensitivity medium-long-wave infrared imaging method and system operating at the normal temperature so as to solve the technical problem that in an existing mainstream medium-long-wave infrared imaging technology, a detector has a large dark current, and consequently medium-long-wave infrared ultra-sensitive detection is difficult to meet. The ultrahigh-sensitivity medium-long-wave infrared imaging method comprises the following steps: (1) a medium-long-wave infrared image is subjected to frequency conversion and enhancement through pump light output by a pump source so as to obtain a high-frequency near-infrared image, wherein the pump light output by the pump source generates near-infrared resonance coherent light, and the medium-long-wave infrared image and the near-infrared resonance coherent light generate the second-order nonlinear effect to conduct frequency conversion and enhancement on the medium-long-wave infrared image; (2) the high-frequency near-infrared image is collected and analyzed, and optical information of the high-frequency near-infrared image is obtained and comprises spectral intensity distribution and a wavefront phase; and (3) the optical information of the high-frequency near-infrared image is converted to obtain enhanced medium-long-wave infrared image information.

Description

technical field [0001] The invention belongs to optical imaging technology, and in particular relates to an ultra-high-sensitivity medium-long-wave infrared imaging method and an imaging system operated at normal temperature. Background technique [0002] Since the photon energy of the medium and long-wave infrared corresponds to the molecular vibration-rotation transition energy level, and the number and position of the peaks of the absorption or transmission spectrum, as well as the intensity distribution of the spectrum can reflect the characteristics of the molecular structure of the substance, so the medium and long-wave infrared is used for identification. The composition of matter has great academic value and application potential in the field of spectroscopy. Mid- and long-wave infrared absorb much more seriously than scattering during atmospheric transmission. There are mainly two atmospheric windows of discrete frequency bands of 3-5 μm and 8-14 μm. At the same tim...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the existing mainstream mid- and long-wave infrared imaging technology has a large dark current in the detector and it is difficult to meet the ultra-sensitive detection of mid- and long-wave infrared, the present invention provides an ultra-high-sensitivity mid- and long-wave infrared imaging method operating at room temperature and imaging system

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