A multi-channel three-dimensional quasi-phase matching method and device

By adjusting the numerical aperture of the microscope objective to change the focusing state of the fundamental frequency light, multi-channel frequency doubling is generated in the three-dimensional nonlinear photonic crystal. This solves the problem of the fixed number of frequency doubling channels in the prior art and achieves a multi-channel frequency doubling effect with controllable channel number and high energy conversion efficiency.

CN116300250BActive Publication Date: 2026-07-03NINGBO UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO UNIV
Filing Date
2022-12-06
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

The number of frequency doubling channels in existing three-dimensional nonlinear photonic crystal structures is fixed and cannot be artificially controlled by external conditions, which limits the flexibility and application value of multi-channel frequency doubling.

Method used

By adjusting the numerical aperture of the microscope objective to control the focusing state of the fundamental frequency light, it is directed onto the nonlinear photonic crystal in a normal incidence manner. Combined with the reciprocal lattice vector of the three-dimensional nonlinear photonic crystal, multi-channel frequency-doubled light wave output is achieved.

Benefits of technology

It achieves multi-channel frequency-doubled optical wave output, with a controllable number of channels, simple operation, no need to change the device structure, and improves the energy conversion efficiency and observation accuracy of the frequency doubling process.

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Abstract

This invention provides a multi-channel three-dimensional quasi-phase matching method and apparatus. The method includes: focusing fundamental frequency light through a microscope objective to obtain fundamental frequency light with a modified focusing state; incident the modified fundamental frequency light onto a nonlinear photonic crystal via normal incidence, and obtaining an outgoing second harmonic through the nonlinear photonic crystal; and finally, outputting multi-channel frequency-doubled light waves based on the outgoing second harmonic. This invention focuses fundamental frequency light onto a nonlinear photonic crystal via a microscope objective, changing the direction range of the incident fundamental frequency wave vector simply by altering the numerical aperture of the focusing objective. Combined with the spatial reciprocal lattice vector combination of the three-dimensional nonlinear photonic crystal, the quasi-phase matching condition is satisfied, achieving variable multi-channel frequency doubling. This invention achieves controllable multi-channel second harmonic generation without structural changes.
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