Brillouin spectrum analysis device and method based on Fourier domain mode locking

Abstract

The invention provides a Brillouin spectrum analysis device and method based on Fourier domain mode locking, and belongs to the technical field of spectrum analysis. The problems that an existing Brillouin spectrum analysis device and method are limited by the tuning speed and the tuning precision of a pump light source, and the measurement speed and the measurement precision cannot meet the requirements of the fields of frontier science, biomedical treatment and the like are solved. A Fourier domain mode-locked pump light source is connected with a first port of a first polarization-maintaining circulator and a first port of a second polarization-maintaining circulator through a double-shaft working polarization splitting prism, and an optical interface to be detected is connected with a second port of the first polarization-maintaining circulator through a single-shaft working polarization splitting prism and a first polarization management delay line. And the to-be-detected optical interface is connected with a second port of the second polarization-maintaining circulator through the single-axis working polarization splitting prism and the second polarization management delay line. The device is mainly used for Brillouin spectrum analysis.

Description

technical field [0001] The invention belongs to the technical field of spectrum analysis, in particular to a Brillouin spectrum analysis device and analysis method based on Fourier domain mode locking. Background technique [0002] With the development of a group of photonic devices (optical whispering gallery mode sensors, femtosecond optical frequency combs) with femtometer-level fine spectral response in the fields of optical sensing, material analysis, medical diagnosis and environmental monitoring, for high-resolution Demand for force spectroscopy devices has grown dramatically. However, in the previous spectral analysis devices and methods, the Fourier transform spectrometer based on the principle of interference modulation and the grating spectrometer based on the principle of diffraction dispersion are limited by the processing error of the spectroscopic element, and the highest spectral resolution can only reach the picometer level, which is far from Meet the spect...

AI Technical Summary

Problems solved by technology

[0004] However, the external cavity laser tuning technology (ECL), vertical cavity surface emitting laser tuning technology (VCSEL) and distributed Bragg reflection laser tuning technology (DBR) adopted in the existing Brillouin spectroscopy devices and methods have been repeatedly The laser longitudinal modes with different start / stop vibrations are used to tune the pump beam. The time delay and phase noise introduced thereby restrict the improvement of the tuning speed and tuning accuracy of the pump light source.

In addition, when the polarization stretching method is used to demodulate the measurement signal of the Brillouin spectrometer device and method, the deviation of the polarization state between the pump beam and the test beam will also lead to a decrease in the accuracy of the measurement results

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