caa a22 4500 465755755 CHVBK 20180323111846.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF01184346 doi (NATIONALLICENCE)springer-10.1007/BF01184346 Malvezzi A. Dipartimento di Elettronica, Universitá di Pavia, Via Abbiategrasso 209, I27100, Pavia, Italy aut Picosecond laser heating and melting of graphite [Elektronische Daten] [A. Malvezzi] Ultrashort laser pulses impinging onto solid, strongly absorbing surface deposit their energy within an absorption depth from the surface. This localized energy deposition may result in rapid and very efficient heating of the surface to temperatures far exceeding the melting or boiling point. Temperature evolution at the surface of samples and their electronic structure may be studied with nonperturbing, time-resolved optical diagnostic techniques. Picosecond laser pulses provide the fastest means for heating matter at high temperature, since the characteristic energy transfer times from photoexcited electrons to the lattice occur in this time scale. Surface evaporation is not affecting the observations in this time scale, simply because there is no time for the surface atoms to escape. As an illustration, measurements on graphite are presented here. The complex index of refraction of highly oriented pyrolytic graphite (HOPG) during picosecond laser irradiation has been measured at 1.06 μm via time-resolved ellipsometry at angles of incidence up to 80∘. In particular, a value of the complex index of refraction for the liquid phase has been derived. Plenum Publishing Corporation, 1990 carbon nationallicence ellipsometry nationallicence graphite nationallicence laser heating nationallicence phase transition nationallicence optical measurements nationallicence ultrafast optical techniques nationallicence International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/4(1990-07-01), 797-809 0195-928X 11:4<797 1990 11 10765 https://doi.org/10.1007/BF01184346 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01184346 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Malvezzi A. Dipartimento di Elettronica, Universitá di Pavia, Via Abbiategrasso 209, I27100, Pavia, Italy aut NATIONALLICENCE 773 0- International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/4(1990-07-01), 797-809 0195-928X 11:4<797 1990 11 10765 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer