Applications and state-of-the-art review of pulsed laser ultrafast time-resolution method in the field of rock mechanics
Pulsed laser imaging technology is well-suited for recording physical processes at extremely short time intervals,achieving time resolutions on the order of attoseconds(10-18 s),owing to advancements in mode-locking technology,chirped pulse amplification,and extra-cavity pulse compression.And the pulsed laser imaging technology has already been applied in biology,chemistry,electrodynamics,and other fields that require ultrafast time-resolution method.In the process of rock fracture,blasting,etc.,the crack propagation rate is close to the speed of sound,and the time interval in indoor experiments lasts only few microseconds.Conventional high-speed photography by continuously increasing the number of consecutive exposures per unit time has reached its technical bottleneck,and a new method is urgently needed to break through the limit of time-resolution of the recording method.A systematic review of the application and state-of-the-art of pulsed laser ultrafast time-resolution technology in the field of rock mechanics was provided in this paper over the following aspects:(1)the development process and application of ultra-short pulsed laser are introduced;(2)on the basis of summarizing the issues related to high strain rate and dynamics in rock mechanics,the application and progress of traditional high-speed photography in such problems are reviewed;and(3)the pulsed laser ultrafast time-resolution method is compared with it,and the results are summarized in this paper.The advantages of pulsed laser ultrafast time-resolution method in solving these problems are summarized.Finally,the advantages of the pulsed laser ultrafast time-resolution method in solving laboratory experiments of rock mechanics with very short physical processes are discussed and prospected in the future.
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