All-fiber CARS spectrum detection device and method

Abstract

The invention discloses an all-fiber CARS spectrum detection device. The device at least comprises a femtosecond optical fiber laser 1, a Stokes optical path portion, a pump optical path portion, a conical excitation and collection optical fiber 13, a second optical fiber filter 15 and a fluorescence spectrum analyzer 16. Compared with the prior art, by using the optical fiber device of the invention, there are advantages of low loss, no calibration, no maintenance and easy integration. Therefore, the all-fiber CARS spectrum detection system can be miniaturized, integrated and flexibly configured, does not need to be regularly maintained by professionals, and is convenient to be used and popularized.

Description

technical field [0001] The invention belongs to the field of nonlinear fiber optics and resonance spectrum detection, in particular to an all-fiber CARS spectrum detection device and method. Background technique [0002] Coherent anti-Stokes Raman scattering (CARS) technology has important applications in the field of nonlinear resonance spectroscopy microscopy due to its unique label-free chemical selective detection capabilities. The CARS technology is a third-order nonlinear optical process based on four-wave mixing. The pump light pulse and the Stokes light pulse are simultaneously incident on the same position of the sample to be tested through the focusing objective lens, and the pump light pulse and the Stokes light pulse are adjusted. The wavelength difference of the Stokes light pulse makes it the same as the resonance frequency of the chemical bond of the target component in the sample to generate the anti-Stokes Raman scattering signal, that is, the CARS signal. B...

AI Technical Summary

Problems solved by technology

Since the CARS process is a third-order nonlinear optical process, in order to improve the excitation efficiency and enhance the CARS signal intensity, ultrashort pulses (picosecond pulses or femtosecond pulses) with high peak power, low duration and repetition frequency are usually used as pumps. Optical pulses and Stokes optical pulses, and such optical pulses are usually generated by titanium sapphire lasers, optical parametric oscillators, optical parametric amplifiers, etc., and realize the excitation and detection of CARS signals through complex spatial optical paths, so the traditional CARS spectrum The detection system is bulky and complex in structure, requiring regular adjustment and maintenance by professionals, and the cost of system construction and use is high

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