A fully electronically controlled dual-Stokes optical wavelength tuning device and method

Abstract

The invention discloses an all-electrically controlled dual-Stokes optical wavelength tuning device, comprising a femtosecond laser (1), an ultrashort pulse power and polarization state adjustment part, a highly nonlinear polarization-maintaining photonic crystal fiber (7), an optical fiber Collimating beam expander (8), optical filter (9), dual Stokes optical pulse delay adjustment part and CARS microscopic imaging system (18), using the soliton self-silicon in highly nonlinear polarization-maintaining photonic crystal fiber The frequency shift effect produces optical solitons whose wavelength can be continuously adjusted in a large range and uses them as Stokes optical pulses. The short-pulse optical power and linear polarization direction can realize the independent and flexible adjustment of the fast axis and slow axis optical soliton wavelengths. The invention enhances the tuning stability of the excitation source of the CARS microscopic imaging system, realizes independent and flexible adjustment of double Stokes wavelengths, and improves the imaging rate of the CARS microscopic imaging system.

Description

technical field [0001] The invention belongs to the fields of nonlinear fiber optics and space optics, and provides a fully electronically controlled dual-Stokes light wavelength tuning device and method for CARS microscopic imaging. Background technique [0002] CARS microscopic imaging technology is a label-free, non-contact, chemically selective and intrinsic three-dimensional imaging biomicroscopic imaging technology based on the four-wave mixing effect, which requires pump light pulses and Stokes light pulses At the same time, it is incident on the sample to be tested, excites the resonance of the chemical bond in the sample to be tested, and generates anti-Stokes Raman scattered light. By detecting the distribution of anti-Stokes Raman scattered light, the characteristic chemical composition in the biological sample can be realized. microscopic imaging. In the CARS microscopic imaging system, it is necessary to continuously adjust the wavelength difference between the...

AI Technical Summary

Problems solved by technology

Traditional CARS microscopic imaging systems usually use two ultrashort pulse lasers or use ultrashort pulse lasers to pump optical parametric oscillators (or optical parametric amplifiers) to generate pump light pulses and Stokes light pulses, so there is pulse synchronization Difficulty, small wavelength tuning range, cumbersome laser maintenance and other disadvantages

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