In situ window cleaning by laser blowoff through optical fiber

A. Alfier, S. Barison, T. Danieli, L. Giudicotti, C. Pagura, R. Pasqualotto

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The feasibility of a window cleaning system based on the laser blowoff technique is investigated to remove the impurity deposition on vacuum windows of the modified reversed field experiment fusion device. The laser pulse is sent to the window through a fused silica fiber optic (=1 mm), then focused on its internal surface, single shot ablating up to ∼5 mm2 of the impurity layer; the focused pulse is scanned across the window to clean its entire surface. The composition of the deposited layer is studied through the secondary ion mass spectrometry and profilometry techniques. Effectiveness of cleaning is analyzed in terms of quality of the cleaned spot, its dimension, repetition rate of the laser, and its wavelength. The energy damage threshold of the fiber optic is also investigated. Three different lasers (microjoule Nd:YAG, Nd:YLF, and ruby) are first tested directly on the window; then only the ruby laser beam is propagated through an optical fiber and tested. © 2008 American Institute of Physics.
Original languageEnglish
Article number10F338
Pages (from-to)-
JournalReview of Scientific Instruments
Issue number10
Publication statusPublished - 2008
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Alfier, A., Barison, S., Danieli, T., Giudicotti, L., Pagura, C., & Pasqualotto, R. (2008). In situ window cleaning by laser blowoff through optical fiber. Review of Scientific Instruments, 79(10), -. [10F338].