High spatial resolution measurement method and system for large-aperture nanosecond pulse laser flux

By using a combination of radiochromic film and opaque paper, combined with net optical density distribution fitting, the problems of high spatial resolution and high precision in laser flux measurement in large-aperture laser devices were solved, and low-cost and high-accuracy laser flux measurement was achieved.

CN119595100BActive Publication Date: 2025-10-03LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Patent Information

Application Number
CN202411870661.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-10-03
Estimated Expiration
2044-12-18

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve high spatial resolution and high-precision laser flux measurement in large-aperture laser devices, and the cost is high. The complex optical path also leads to inaccurate measurement results.

Method used

A method combining radiochromic film and opaque paper is adopted. The radiochromic film is irradiated once with multiple groups of laser flux beams with different values ​​to obtain the spatial distribution of optical characteristic parameters. The net optical density distribution is used to fit the laser flux distribution, and high spatial resolution measurement is achieved in combination with computer processing.

Benefits of technology

It achieves micron-level high spatial resolution laser flux measurement, reduces measurement costs, is suitable for large-aperture laser systems, and improves measurement accuracy and reliability.

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Abstract

The present invention relates to the field of laser flux measurement technology, and specifically to a high spatial resolution measurement method, system, electronic device, and storage medium for large-aperture nanosecond pulse laser flux. The method comprises: obtaining the spatial distribution of optical characteristic parameters of an original radiochromic film and opaque paper; placing the radiochromic film in an optical path, and sequentially irradiating different positions of the radiochromic film with multiple sets of different laser flux beams; pre-processing the irradiated radiochromic film and extracting the spatial distribution of the optical characteristic parameters of the pre-processed radiochromic film; extracting the net optical density distribution before and after irradiation based on the spatial distribution of the optical characteristic parameters of the original radiochromic film, the opaque paper, and the pre-processed radiochromic film; and fitting a relationship curve between the laser flux and the net optical density distribution based on the net optical density before and after irradiation. The purpose is to achieve high spatial resolution and accurate measurement of large-aperture laser flux while reducing measurement costs.
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Citation Information

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