X-ray speckle reduction using a high-speed piezoelectric deformable mirror system
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作者
Yan, Shuai; Jiang, Hui; Jiang, Zhisen; Liang, Dongxu; Xie, Jianan; Zhu, Hai; Shu, Guoyang; Ben, Ningyu; Li, Aiguo
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刊物名称
HIGH POWER LASER SCIENCE AND ENGINEERING
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年、卷、文献号
2025, ,
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关键词
Yan, Shuai; Jiang, Hui; Jiang, Zhisen; Liang, Dongxu; Xie, Jianan; Zhu, Hai; Shu, Guoyang; Ben, Ningyu; Li, Aiguo
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摘要
An advanced deformable Kirkpatrick-Baez (K-B) mirror system was developed, equipped with high-speed piezoelectric actuators, and designed to induce beam decoherence and significantly enhance the quality of X-ray imaging by minimizing undesirable speckles in synchrotron radiation or free-electron laser facilities. Each individual mirror is engineered with 36 independent piezoelectric actuators that operate in a randomized manner, orchestrating the mirror surface to oscillate at a high frequency up to 100 kHz. Through in situ imaging single-slit diffraction measurement, it has been demonstrated that this high-frequency-vibration mirror system is pivotal in disrupting the coherent nature, thereby diminishing speckle formation. The impact of the K-B mirror system is profound, with the capability to reduce the image contrast to as low as 0.04, signifying a substantial reduction in speckle visibility. Moreover, the coherence of the X-ray beam is significantly lowered from an initial value exceeding 80% to 13%.
