|
|||||
|
|
Monitoring laser cleaning of titanium alloys by probe beam reflection and emission spectroscopy |
|
| Authors: | D. J. Whitehead P. L. Crouse M. J. J. Schmidt L. Li M. W. Turner A. J. E. Smith |
| Affiliation: | (1) Department of Physics, Center for Nanotechnology at CYCU and R&D Center for Membrane Technology, Chung Yuan Christian University, Chung-Li, Taiwan, R.O.C.;(2) Department of Physics, National Central University, Chung-Li, 320, Taiwan, R.O.C.;(3) Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.;(4) Department of Electronic Engineering, Tung Nan Institute of Technology, Taipei, Taiwan, R.O.C.;(5) Department of Electrical Engineering, Yuan Ze University, Chung-Li, Taiwan, R.O.C. |
| Abstract: | The energy relaxation of electrons in InN epilayers is investigated by excitation- and electric field-dependent photoluminescence (PL). From the high-energy tail of PL, we determine the electron temperature of the hot carriers. It was found that the electron temperature variation can be explained by a model in which the longitudinal optical (LO)-phonon emission is the dominant energy relaxation process. The LO-phonon lifetime is fitted to be 0.89 ps, which is higher than the theoretical phonon lifetime. This deviation is attributed to the presence of the non-equilibrium hot-phonon effects. PACS 78.55.Cr; 78.66.Fd; 61.66.Fn; 78.20.Jq; 63.20.kd |
| Keywords: | KeywordHeading" >PACS 42.55.Lt 42.62.Fi 81.65.Cf 82.53.Eb |
| 本文献已被 SpringerLink 等数据库收录！ | |