Automatic collimation backward CARS detection system and method of all-fiber structure

Abstract

The invention discloses an automatic collimation backward CARS detection system and method of an all-fiber structure, and the system comprises a light source module (100) which comprises a pump laser (1), a first circulator (2) and a nonlinear optical fiber (4) which are sequentially connected through a light path, and a CARS probe module (200) which comprises a second circulator (6) and a focusing end cap (7) which are sequentially connected through a light path, the pump light and the Stokes being focused on a sample through a focusing end cap (7), a CARS process occuring on the sample, and backward CARS signal light being generated; and a detection module (300) which comprises a detector (10) and forms an automatic collimation backward CARS detection system with a closed all-fiber structure. The pump light and the Stokes light are focused on the CH4 sample through the focusing end cap, the CARS process occurs on the sample, and the generated backward CARS signal is transmitted to the detection module through the optical fiber to enter the detector, so that the wavelength of the CARS signal can be measured, and automatic collimation backward CARS detection of an all-optical fiber structure is realized.

Description

technical field [0001] The invention belongs to the technical field of fastening equipment, and more specifically, relates to an automatic collimation backward CARS detection system and method with an all-fiber structure, which is used to realize a compact CARS spectrometer / microscope with an all-fiber structure without adjusting the optical path, It has broad application prospects in the fields of biological imaging, temperature field measurement and species detection. Background technique [0002] CARS spectroscopy is a nonlinear laser spectroscopy technique that uses the Raman activity of molecules to obtain characteristic spectral signals of molecules, and is widely used in the fields of molecular detection or imaging in chemistry and biology. Compared with fluorescence spectroscopy and Raman spectroscopy, it has unique advantages due to its non-invasive detection, signal spectrum peaks located in the short-wavelength direction of pump light (to avoid fluorescence interf...

AI Technical Summary

Problems solved by technology

On the other hand, the current CARS spectroscopy technology uses two or more laser light sources, one of which is used as pump light, and the other laser (usually produced by dye laser or OPO) is used as Stokes light, requiring at least two Laser or at least one laser cooperates with OPO to provide input laser, which cannot be miniaturized yet

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