Single-exposure beam quality analysis via lens-free coherent amplitude modulation imaging.

IF 3.1 2区 物理与天体物理 Q2 OPTICS Optics letters Pub Date : 2024-12-15 DOI:10.1364/OL.541211
Chunyu Zou, Suhas P Veetil, Zhilong Jiang, Cheng Liu, Jianqiang Zhu
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Abstract

A single-exposure method for complex amplitude reconstruction in beam quality analysis is proposed, utilizing lens-free coherent amplitude modulation imaging (LF-CAMI). This approach leverages a partially saturated diffraction pattern to reconstruct the complex amplitude of a measured laser beam. The corresponding intensity images near the beam waist along the axial direction are determined directly via the Fresnel diffraction formula. Spatial beam parameters, including the beam quality factor M2, are then calculated following the ISO 11146-1 standard. The feasibility of the proposed method is validated through theoretical analysis and experiments, targeting both static and dynamic laser beams. Experimental results demonstrate that this method yields results consistent with those obtained using commercial beam quality analysis instruments while reducing the total measurement time by approximately 80%. The proposed method is compact, cost-effective, and immune to aberrations and offers a fast and accurate measurement process, making it particularly suitable for beam quality analysis in various laser systems, especially pulsed laser systems.

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通过无透镜相干振幅调制成像进行单次曝光光束质量分析。
利用无透镜相干振幅调制成像(LF-CAMI),提出了一种用于光束质量分析中复杂振幅重建的单次曝光方法。这种方法利用部分饱和衍射图样来重建被测激光光束的复合振幅。光束腰部附近沿轴向的相应强度图像可通过菲涅尔衍射公式直接确定。然后按照 ISO 11146-1 标准计算光束空间参数,包括光束质量因子 M2。针对静态和动态激光束,通过理论分析和实验验证了所提方法的可行性。实验结果表明,该方法得出的结果与使用商用光束质量分析仪器得出的结果一致,同时将总测量时间缩短了约 80%。所提出的方法结构紧凑、成本效益高、抗畸变能力强,测量过程快速准确,特别适用于各种激光系统,尤其是脉冲激光系统的光束质量分析。
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来源期刊
Optics letters
Optics letters 物理-光学
CiteScore
6.60
自引率
8.30%
发文量
2275
审稿时长
1.7 months
期刊介绍: The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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