[16a-PB2-1~4] 3.4 Laser system and materials

[16a-PB2-3] Variation of laser-induced damage threshold and spectral characteristics by voltage application

〇(B)Tomokazu Nakai¹, Katsuhiro Mikami^1,2, Shogo Hashimoto², Kazuyuki Uno³, Shinji Motokoshi⁴, Takahisa Jitsuno^5,6 (1.Kindai Univ., 2.Grad.School of Kindai Univ, 3.Univ. Yamanashi, 4.Institute for Laser Technology, 5.ILE Osaka Univ., 6.ELI-NP)

Keywords:

laser-induced damage,voltage application

We conducted research aimed at clarifying the effect of applying voltage from an electrode to an optical element on the laser-induced damage threshold (LIDT). Applying a DC voltage of 1 kV for 10 minutes to a single-layer titanium oxide film deposited on a quartz glass substrate resulted in distinct discoloration observed in the electrode contact region. This discoloration disappeared within several days to weeks, confirming its reversibility. The LIDT changed before and after voltage application, revealing that the effect differed depending on the polarity of the electrode contacting the optical thin film.