Photoacoustic evidence of target ablation for LPVD of YBCO thin films

• Published in: Applied surface science Vol. 136; no. 1; pp. 166 - 171
• Main Authors: Apostol, Ileana, Stoian, R, Dabu, R, Stratan, A
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.1998; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cuprates superconductors (high tc and insulating parent compounds); Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; High-Tc compounds; High-tc films; Impact phenomena (including electron spectra and sputtering); Laser-beam impact phenomena; Laser-induced ablation; Laser-induced acoustic waves; Physics; Superconducting films and low-dimensional structures; Superconductivity; Threshold fluence; Y-based cuprates; YBCO; Laser-induced ablation; AB; BC; CU; ACE; OD; LC; YB; Laser-induced acoustic waves; Threshold fluence; YBCO; PO; Inorganic compounds; Physical radiation effects; Transition element compounds; Experimental study; Laser beams; Particule-surface interactions; Thin films; Barium oxides; High-Tc superconductors; Laser ablation technique; Quaternary compounds; Copper oxides; Yttrium oxides; Photoacoustic effect
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/S0169-4332(98)00299-2

In the case of complex processes related to the laser interaction with solid materials, elastic waves appear in the volume of the target and their waveforms and intensities are used to characterise the phenomena taking place in the interaction region. The ablation threshold of YBCO targets under 1.064 μm, 532 nm and 266 nm pulsed laser irradiation was evidenced with a photoacoustic method at 0.08–0.9 J/cm 2, as a function of irradiation parameters (laser wavelength, spot area, target density). An estimation of the congruent ablation threshold is also proposed.