Method for calculating characterization value of detuning angle efficiency of full-aperture harmonic conversion crystal

By constructing an efficiency function based on the full-aperture detuning angle distribution data and optimizing the crystal rotation adjustment amount around the axis, the problem of inconsistency in the detuning angle of large-aperture harmonic conversion crystals across the entire optical aperture range is solved, improving the overall harmonic conversion efficiency and assembly efficiency. This method is suitable for high-power laser devices and nonlinear optical components.

CN122448490APending Publication Date: 2026-07-24BEIHANG UNIV
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Patent Information

Application Number
CN202610745797.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-27
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies cannot effectively solve the problem of inconsistent detuning angles in large-aperture harmonic conversion crystals across the entire optical aperture range, resulting in the overall harmonic conversion efficiency failing to reach its optimal level and making it difficult to meet the engineering requirements of high-power laser devices.

Method used

By acquiring the detuning angle distribution data of the harmonic conversion crystal across the entire aperture, calculating the characterization value and performing spatial integration, constructing the efficiency function, and optimizing the crystal's rotation adjustment around the axis, the phase mismatch distribution across the entire aperture range is minimized, thereby improving the overall harmonic conversion efficiency.

Benefits of technology

It achieves a harmonic conversion efficiency of over 99% under full-aperture beam irradiation, shortens the assembly and adjustment cycle, and improves the repeatability and stability of the assembly and adjustment results. It is suitable for multi-field applications of high-power laser devices and nonlinear optical components.

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Abstract

The invention relates to the technical field of precision optical engineering measurement, in particular to a full-aperture harmonic conversion crystal mistuning angle efficiency characterization value calculation method, which comprises the following steps: acquiring mistuning angle distribution data; determining a representation value calculation interval; calculating actual detuning angle distribution corresponding to each spatial position of the crystal; calculating phase mismatch distribution of each spatial position; constructing an efficiency function reflecting the overall harmonic conversion efficiency of the crystal under the irradiation of the full-aperture light beam; and carrying out numerical optimization calculation on the efficiency function, and determining the crystal axis rotation adjustment amount corresponding to the global maximum value as the harmonic conversion crystal mistuning angle efficiency characterization value in the full-aperture range. According to the scheme, the phase mismatch degree of each spatial position in a full-aperture range is aggregated in a spatial integration mode to form an overall efficiency evaluation function capable of numerical optimization, and the global optimal characterization value obtained by solving under the physical constraint of single reset angle adjustment can enable the phase mismatch distribution in a crystal full-light-transmission area to achieve overall minimization. And the efficiency level is high.
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