研究目的
To investigate the type-II second-harmonic generation (SHG) induced by vectorial laser modes and understand the role of spin-orbit-coupling (SOC) in nonlinear interactions.
研究成果
The study provides a unified description of type-II SHG compatible with both scalar and vector cases, demonstrating how the SOC structures of pump fields affect and control the intensity and spatial structure of the created nonlinear polarizations. The results enhance the fundamental understanding of SOC-mediated nonlinear optics and lay the foundation for future studies and applications.
研究不足
The study is limited to collimated and monochromatic input vector beams and does not consider nonlinear interactions with focused vector beams occurring within several orders of the Rayleigh distance. The experimental verification is also constrained by the specific vector modes and nonlinear crystal used.
1：Experimental Design and Method Selection:
The study involves theoretical analysis and experimental verification of type-II SHG driven by vector laser modes. The theoretical framework is based on Dirac notation to describe and analyze vector modes and their nonlinear interactions.
2：Sample Selection and Data Sources:
Two typical vector modes, cylindrical vector (CV) modes and full Poincaré (FP) modes, are used as examples to demonstrate the influence of SOC on nonlinear interactions.
3：List of Experimental Equipment and Materials:
A horizontally polarized TEM00 mode beam at 800 nm, spatial light modulator (SLM), polarizing beam splitter (PBS), half-wave plate (HWP), quarter-wave plate (QWP), Dove prism, dichroic mirror (DM), and a 5-mm-long type-II PPKTP crystal.
4：Experimental Procedures and Operational Workflow:
The experimental setup involves generating vector modes using an SLM and a polarization Sagnac interferometer, focusing the generated vector pump into the PPKTP crystal to drive SHG, and analyzing the generated SHG fields.
5：Data Analysis Methods:
The spatial structures and intensities of the generated SHG fields are analyzed using diffraction integral methods and compared with theoretical predictions.
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