High Power Laser Science and Engineering, Volume. , Issue , ()
X-ray speckle reduction using a high-speed piezoelectric deformable mirror system [Early Posting]
An advanced deformable Kirkpatrick-Baez mirror system was developed, equipped with high-speed piezoelectric actuators, 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 an 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 a mere 13%.