High-sensitivity all-optical-fiber anti-stokes Raman detection system

Abstract

The invention provides a high-sensitivity all-optical-fiber anti-stokes Raman detection system. A light output end of an optical fiber laser device is connected with a first optical fiber and a second optical fiber respectively; a light outgoing end of the first optical fiber is connected with an optical fiber high-pass filter by a non-linear optical fiber; a stokes light output end of the optical fiber high-pass filter is jointly connected with a fourth optical fiber through pump light outgoing ends of a third optical fiber and the second optical fiber; a light outgoing end of the fourth optical fiber sequentially passes through an optical fiber grating filter, an optical fiber bundle and a convex lens to reach an incidence end of a sample; a light reflection end of the sample is connected with a first collection optical fiber and a second collection optical fiber by the optical fiber bundle and the optical fiber grating filter in sequence; a light outgoing end of the first collection optical fiber is connected with a light signal strength detection unit; and a light outgoing end of the second collection optical fiber is connected with a spectral signal detection unit. According to the high-sensitivity all-optical-fiber anti-stokes Raman detection system, the full optical fiberization of a light source and epi-CARS signal detection can be realized, so that the simplification and miniaturization of a high-sensitivity CARS detection system can be realized, and the application range of the CARS detection system is enlarged.

Description

technical field [0001] The invention relates to an all-fiber anti-Stokes Raman detection technology. In particular, it relates to a high-sensitivity all-fiber anti-Stokes Raman detection system that uses a fiber laser directly combined with a nonlinear fiber to generate a supercontinuum Background technique [0002] With the development of nanoscience, the observation and characterization of micro-nano scale has become a necessary technology for nano-scale research. For example, major discoveries made in the field of biomedicine in recent years are basically based on the observation, characterization, and even manipulation of micro-nano-scale functional structures such as cells and molecules. In addition, with the development of new processing methods such as femtosecond laser resonance absorption and pulse sequence control, the precision of laser micro / nano processing is getting higher and higher, even reaching the nanoscale, but there is still a lack of effective processi...

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Problems solved by technology

[0007] However, the current CARS system basically uses a bulky solid-state laser as the light source, and needs to build an optical path in free space to realize the propagation of the beam. The whole system is relatively complicated, and the volume is large, and the stability of the optical path is poor.

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