基于多路峰值保持电路的纳秒级大光斑测量系统

李国超; 舒俊; 刘克富; 赵晖; 邱剑

doi:10.11884/HPLPB202638.250330

基于多路峰值保持电路的纳秒级大光斑测量系统

doi: 10.11884/HPLPB202638.250330

复旦大学智能机器人与先进制造创新学院，上海 200433

基金项目: 复旦-长光合作基金项目（FC2017-002）

详细信息

作者简介:
李国超，23210720099@m.fudan.edu.cn

通讯作者:
邱　剑，jqiu@fudan.edu.cn。

计量
- 文章访问数: 12
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- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2025-10-09
- 修回日期: 2026-01-27
- 录用日期: 2026-01-08
- 网络出版日期: 2026-02-10

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

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

摘要

摘要: 针对大光斑、窄脉冲激光在测量中因光路整形畸变、瞬态难捕获及相干性要求等限制导致的幅值失真与采样困难问题，提出了一种面向纳秒级脉冲大光斑面型激光的光束质量测量系统。系统采用三维步进平台联合光电探测器实现光斑强度的空间重建，并设计多通道峰值保持电路以锁存脉冲峰值，确保幅度采集的瞬态准确性。为应对部分光斑截断及边界不完整等非理想条件，系统引入圆拟合方法作为对能量二阶矩计算的补充，增强了光斑尺寸评估的鲁棒性。实验选用垂直腔面发射激光器作为典型光源，开展轴向扫描测量，比较不同方法下光斑尺度与能量分布的一致性。结果表明，该系统在纳秒激光脉冲与大尺寸光斑条件下具备良好的测量稳定性与适应能力，能够为光束几何特性和能量结构的多维评估提供有效支撑。
- 光束质量测量 /
- 峰值保持电路 /
- 纳秒脉冲激光 /
- 大光斑激光
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

HTML全文

图 1 激光光束质量测量系统。

Figure 1. Laser Beam Quality Measurement System

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图 2 跨导峰值保持电路

Figure 2. Transconductance peak-hold circuit

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图 3 多路并行峰值保持电路

Figure 3. The multi-channel parallel peak-hold circuit

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图 4 多通道峰值保持电路实验

Figure 4. multi-channel peak-hold circuit experiment

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图 5 不同z位置下激光光斑的尺寸

Figure 5. The size of the laser spot emitted at different z positions

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图 6 激光光斑尺寸随位置变化关系

Figure 6. Laser spot size versus position

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