Fully electronically controlled double-Stokes optical wavelength tuning device and method

Abstract

The invention discloses a fully electronically controlled double-Stokes optical wavelength tuning device, comprising a femtosecond laser (1), an ultrashort pulse power and polarization state adjustment part, a high nonlinear polarization-maintaining pohotonic crystal fiber (7), an optical fiber collimation and beam expanding mirror (8), an optical filter (9), double-Stokes optical pulse delay adjustment part and a CARS microimaging system (18), wherein optical soliton with a wavelength capable of being continuously adjusted within a wide range is generated by the soliton self frequency shifteffect in the high nonlinear polarization-maintaining pohotonic crystal fiber and is used as a Stokes optical pulse, and the ultrashort pulse optical power entering the high nonlinear polarization-maintaining pohotonic crystal fiber and the linear polarization direction are changed by an electronically controlled liquid crystal wave plate and an electronically controlled liquid crystal polarization rotating sheet, so that the independent and flexible adjustment of the wavelengths of the optical solitons of a fast axis and a slow axis can be achieved. The fully electronically controlled double-Stokes optical wavelength tuning device disclosed by the invention enhances the tuning stability of an excitation source of the CARS microimaging system, realizes the independent and flexible adjustment of double-Stokes wavelength, and improves the imaging rate of the CARS microimaging 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

Images