Abstract
We observed plume expansion dynamics during pulsed laser ablation in background gas when two plumes collided head-on. The Si target is irradiated followed by the Ge target with delay time t d. When t d is larger than a few μs, the Si plume emission quenches before the irradiation of the Ge target. Re-emission of quenched Si atomic species by the collision with counter Ge plume is observed. The intensity and lifetime of Si re-emission decrease with increasing t d, and rapid decrease at around t d = 60 μs is observed. These results indicate that non-luminescent Si atomic species exist between targets up to about t d = 60 μs and effects of the collision rapidly decrease at above about t d = 60 μs. Effects of the collision of Si and Ge plumes and the re-emission of quenched Si atomic species are discussed.
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This work was partially supported by a Grant- in-Aid for Scientific Research from the Japan Society for the Promotion of Science.
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Umezu, I., Hashiguchi, Y., Fukuoka, H. et al. Dynamics of colliding laser ablation plumes in background gas. Appl. Phys. A 122, 485 (2016). https://doi.org/10.1007/s00339-016-9993-y
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DOI: https://doi.org/10.1007/s00339-016-9993-y