快发光闪烁体上升沿精确测量及其在超快光电探测中的应用OA

As a key material for converting high-energy radiation into optical signals,the rise time of scintillators directly affects the time resolution of detection systems.This parameter is crucial for cutting-edge applications such as pulse diagnostics and beam monitoring in X-ray free-electron laser(XFEL)facilities,as well as time-of-flight positron emission tomography(TOF-PET).This work thoroughly explores the significance of the rise time,a core temporal performance parameter of scintillators,highlights the limitations of existing measurement techniques,and proposes an innovative high-precision measurement scheme.The study utilizes a 355 nm picosecond pulsed laser,splitting the beam into trigger and excitation paths,coupled with a spectrometer for monochromatic light selection.This approach effectively overcomes challenges such as laser pulse jitter and weak fluorescence signal acquisition.Experimental results show that,the traditional LYSO:Ce scintillator has a rise time of(273.7±26.9)ps,while the emerging all-inorganic perovskite scintillator CsPbCl3 exhibits an ultrafast rise time as low as(209.6±6.7)ps and a decay time of only(663.4±34.2)ps.This sub-hundred-picosecond rise time and ultrafast response characteristic highlight the great potential of CsPbCl3 in the field of gigahertz high-repetition-rate ultrafast detectors.It provides critical technical support for bunch-by-bunch diagnostics in synchrotron radiation and free-electron laser facilities,while also offering key methodologies and physical data for the screening and optimization of next-generation ultrafast scintillators.