Visible reflection variation in the case of high-temperature superconductor ceramics irradiated by excimer lasers

Eugene M. Kudriavtsev; Sergey D. Zotov; Bernard L. Fontaine; Bernard M. Forestier; Marc L. Sentis; Vladimir I. Marine; Michel L. Autric

doi:10.1117/12.334476

22 December 1998 Visible reflection variation in the case of high-temperature superconductor ceramics irradiated by excimer lasers

Eugene M. Kudriavtsev, Sergey D. Zotov, Bernard L. Fontaine, Bernard M. Forestier, Marc L. Sentis, Vladimir I. Marine, Michel L. Autric

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Proceedings Volume 3574, XII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1998) https://doi.org/10.1117/12.334476
Event: Twelfth International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, 1998, St. Petersburg, Russian Federation

Abstract

Experiments on visible reflection change of High Temperature Superconductors (HTSC) ceramic oxides YBaCuO and NdCeCuO as a result of irradiation by ArF(193 nm) and XeCl(308 nm) excimer lasers were fulfilled for conditions typically below strong ablation threshold. The work was started on the base of a suggestion about inter-molecular structure modification of HT SC materials by means of laser irradiation with the frequency close to or in resonance with vibration or electronic bonds of lattice. Another goal was to find the conditions of the wave of reflection and conduction (WRC) excitation in YBaCuO and NdCeCuO by one of two mentioned excimer lasers. It was detected typically unreversible increase of visible linear- polarized light reflection from ceramics YBaCuO and NdCeCuO in super conducting and semi-conducing phases as a result of irradiation by pulse of ArF- and XeCl excimer lasers. It means that conditions of WRC excitation were not found probably because of ablation influence. It was observed also a cumulative effect of successive laser shots on the relative increase of reflection below threshold for ablation. X-ray micro-analysis showed the appearance of Ce -- or Ba -- reached clusters on the surface of irradiated samples. It gives evidence that reflection increasing could be caused by appearance of mental particles on the surface. The threshold of ablation was evaluated as 0.1 - 0.4 J/cm² for 4 combinations of experimental conditions.

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Eugene M. Kudriavtsev, Sergey D. Zotov, Bernard L. Fontaine, Bernard M. Forestier, Marc L. Sentis, Vladimir I. Marine, and Michel L. Autric "Visible reflection variation in the case of high-temperature superconductor ceramics irradiated by excimer lasers", Proc. SPIE 3574, XII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (22 December 1998); https://doi.org/10.1117/12.334476

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KEYWORDS

Reflection

Excimer lasers

Laser ablation

Ceramics

Cerium

Laser damage threshold

X-rays

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