An on-line measuring device and method for high-energy broadband pulsed laser field and far-field focal spot

By simultaneously acquiring spatial diffraction mode and spectral intensity mode data, and using a multi-mode fusion iterative algorithm to reconstruct the high-energy broadband pulsed laser field and far-field focal spot, the problems of insufficient measurement accuracy and weak environmental anti-interference ability in the existing technology are solved, and high-precision reconstruction of the high-energy broadband pulsed laser field and far-field focal spot is achieved.

CN121577154BActive Publication Date: 2026-05-12SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610108731.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-27
Publication Date
2026-05-12
Estimated Expiration
2046-01-27

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve high-precision, real-time online measurements of high-energy broadband pulsed laser light fields and far-field focal spots. Furthermore, traditional methods suffer from distortion in reconstructing complex amplitude distributions under broadband laser conditions, failing to accurately reflect the spectral synthesis effect.

Method used

Spatial diffraction mode data and spectral intensity mode data are acquired synchronously using a single laser pulse. The near-field complex amplitude distribution and far-field focal spot distribution of the high-energy broadband pulsed laser light field are reconstructed through a multi-modal fusion iterative algorithm. A measurement device consisting of an intensity attenuation system, a beam splitter, a spatial encoder, an area array light intensity detector, and a spectral analysis unit is used, and the data is processed in conjunction with a multi-modal light field reconstruction algorithm.

Benefits of technology

It achieves high-precision reconstruction of the high-energy broadband pulsed laser field and far-field focal spot. It has a simple structure, strong resistance to environmental interference, and is suitable for online measurement of high-power laser devices, reducing costs and improving measurement accuracy.

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Abstract

An on-line measuring device and method for high-energy broadband pulsed laser field and far-field focal spot: the broadband pulsed laser generated by a high-energy laser is first processed by an intensity attenuation system, and then reaches a beam splitting element; the light beam transmitted through the beam splitter passes through a coding plate, which codes and modulates the light beam, and then a single-frame diffraction image intensity formed after the coding plate modulation is recorded by a surface array light intensity detector; the light beam reflected by the beam splitting element is recorded by a spectral analysis unit. With the single-frame diffraction image intensity recorded by the surface array light intensity detector and the single-spectrum data recorded by the spectral analysis unit, the near-field complex amplitude (intensity and phase) distribution of the high-energy broadband pulsed laser field to be measured can be accurately reconstructed through a multi-modal light field reconstruction algorithm, and the far-field focal spot distribution can also be obtained. The method has the advantages of simple structure, low cost and strong environmental anti-interference ability.
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