A nanosecond large-spot laser measurement system based on a multi-channel peak-hold circuit

Li Guochao; Shu Jun; Liu Kefu; Zhao Hui; Qiu Jian

doi:10.11884/HPLPB202638.250330

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Article Navigation > High Power Laser and Particle Beams > 2026 > Accepted Manuscript

Li Guochao, Shu Jun, Liu Kefu, et al. A nanosecond large-spot laser measurement system based on a multi-channel peak-hold circuit[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250330

Citation:

Li Guochao, Shu Jun, Liu Kefu, et al. A nanosecond large-spot laser measurement system based on a multi-channel peak-hold circuit[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250330

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A nanosecond large-spot laser measurement system based on a multi-channel peak-hold circuit

doi: 10.11884/HPLPB202638.250330

College of Intelligent Robotics and Advanced Manufacturing Fudan University, Shanghai 200433, China

Received Date: 2025-10-09
Accepted Date: 2026-01-08
Rev Recd Date: 2026-01-27

Available Online: 2026-02-10

Abstract

Abstract

Background
With the continuous advancement of photoelectric applications such as LiDAR, three-dimensional sensing, and free-space communication towards longer distances, larger fields of view, and higher precision, large-spot, nanosecond-pulse lasers are progressively emerging as a critical type of light source, owing to their advantages in far-field uniform illumination and weak signal detection.
Purpose
To address the challenges of amplitude distortion and sampling difficulties in beam quality measurements of large-spot, nanosecond-pulse lasers caused by optical path shaping distortions, transient capture limitations, and coherence requirements, this paper proposes a beam quality measurement system tailored for nanosecond pulsed large-aperture lasers.
Methods
The system employs a three-dimensional stepping platform combined with a photodetector to reconstruct the spatial intensity distribution of the beam, and incorporates a multi-channel peak-hold circuit to accurately latch pulse peaks, thereby ensuring transient fidelity in amplitude acquisition. To mitigate non-ideal conditions such as partial beam truncation and incomplete boundaries, a circle-fitting method is introduced as a complement to the second-moment calculation of energy, enhancing the robustness of beam size evaluation.
Results
Experiments employing a typical vertical-cavity surface-emitting laser (VCSEL) were conducted through multi-position 3D axial scanning, comparing the consistency of beam size and energy distribution measured by different methods.
Conclusions
The results verify the measurement reliability and applicability of the proposed system under large-spot, nanosecond-pulse conditions, offering an effective means for laser beam quality assessment in related applications.
- beam quality measurement,
- peak-hold circuit,
- nanosecond pulse laser,
- large-spot laser

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References(17)

References

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