Time resolution elliptical polarization spectrum measuring system

Abstract

The invention belongs to the technical field of an optical electronic device and particularly relates to a time resolution elliptical polarization spectrum measuring system. The measuring system provided by the invention comprises a laser device, a beam splitter, reflectors, a delayer, a beam expander, a sample, a polarizer, a multi-channel analyzer, a CCD (charge coupled device) detector, a computer system, a stepper motor and the like, wherein the laser device adopts a tunable femtosecond ultrafast laser light source; the pulse light which is emitted from the light source is divided into pump light and detection light through the beam splitter; the pump light is vertically irradiated to the sample after passing through the delayer, the two reflectors and the beam expander; the detection light is irradiated to the sample after passing through the beam expander and the polarizer; the light passes through the multi-channel analyzer after being reflected by the sample and detected by the CCD surface array detector; and a computer computes the corresponding time resolution optical constant spectrum. The time resolution elliptical polarization spectrum measuring system provided by the invention has wide application prospects in multiple fields of physics, chemistry, biomedicine, environmental science and the like.

Description

technical field [0001] The invention belongs to the technical field of optical and electronic devices, and in particular relates to a time-resolved ellipsometry measurement system. Background technique [0002] The interaction between light and matter involves many transient processes, such as electronic transitions in solids, fluorescence emission and internal transformation processes of biological and chemical materials, etc. By measuring the evolution of reflectivity, transmittance or polarization state over time after light passes through the material, the dynamic process inside the substance can be studied, and important information such as the state of motion of molecules or electrons in the substance, such as electronic energy levels and electronic state pairing can be obtained. . When light interacts with matter, the light field causes the polarization of molecules or electrons, resulting in the distribution of molecules or electrons and the evolution of their distr...

AI Technical Summary

Problems solved by technology

However, the current ellipsometry technology is limited to measuring the optical constants of materials in the steady state, and cannot measure the transient optical constants.

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