Abstract
Ultraviolet laser-induced voltage (LIV) measurements were performed on dielectric rock cores. The LIV response in the dielectric core samples were measured with the laser spot partially irradiated at the surfaces under a bias of 210 V, and the accumulation of interface charges was considered resulting in the transient voltage response. The voltage waveforms at the shale and sandstone were different in maximum values (Vp) and full width at half maximum in accordance with the components and structures. Vp, as a function of spot position, depended on the distance between the laser spot and the electrode planes. In addition, ablation was observed in the rock surface irradiated by the pulsed laser, which was associated with rapid buildup of electrons and generation of intrinsic defects in the cores. Therefore, the LIV method can promote the understanding of the interaction between intense laser and dielectric materials.
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