Nonlinear medium multi-polarization optical calibration device based on degenerate four-wave mixing effect

Abstract

The invention provides a nonlinear medium multi-polarization optical calibration device based on a degenerate four-wave mixing effect. The device comprises a laser (1), a first half-wave plate (2), a first polarization beam-splitting cube (3), a first reflector (4), a second half-wave plate (5), a second polarization beam-splitting cube (6), a third half-wave plate (7), a second reflector (8), a fourth half-wave plate (9), a third reflector (10), a fourth reflector (11), a vector light generation device (12), a third polarization beam-splitting cube (13), a focusing lens (14), a nonlinear optical action unit (15), a calibration recording device (16) and a polarization switcher (17). The multi-polarization optical path structure is innovatively designed, so that multiple pumping laser beams and polarization switching laser beams with multiple polarization states are simultaneously generated based on the same laser source, multi-polarization optical calibration of a nonlinear medium is realized, and the multi-polarization optical calibration device has a wide application prospect.

Description

technical field [0001] The invention belongs to the application field of nonlinear optics, and in particular relates to a nonlinear medium multi-polarization optical calibration device and a multi-polarization optical calibration method based on the degenerate four-wave mixing effect. Background technique [0002] Four-wave mixing is an important third-order nonlinear process. Three beams of incident light interact with the sample at the same time. Under the conditions of phase matching, a fourth beam of light is generated, which is called a four-wave mixing (FWM) signal. If the frequencies of the three incident beams are equal, it is called degenerate four-wave mixing (DFWM). DFWM is a spectral resolution technique with high sensitivity, high resolution and high signal-to-noise ratio. Since most biomolecules are polar molecules, the alignment and structure of molecules that make up biological tissues will change under the action of polarized laser light, which will affect ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a non-linear medium multi-polarization optical calibration device and method based on the degenerate four-wave mixing effect for the existing multi-light source polarization-resolving nonlinear medium. The polarization-resolving optical path structure enables simultaneous generation of pumping laser beams and polarization-switched laser beams based on the same laser source, and simultaneous generation of polarization-switched laser beams with multiple polarization states based on the same laser source, realizing multi-polarization for nonlinear media Optical calibration has broad application prospects

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