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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper QTuB15

Electronic excitation-enhanced crystallization of amorphous films?

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Abstract

The study of the interaction of ultrashort laser pulses with solids has raised some important questions concerning the nature of the transformations occurring at the material surface in the presence of very strong levels of electronic excitation. Even though the presence of electronic excitation-induced metastable transient phases has been demonstrated in several materials on irradiation with femtosecond laser pulses,1'5 the role of electronic excitation in permanent phase transitions is still not fully understood, and different nonthermal effects have been invoked to explain permanent structural changes induced in amorphous Si and Ge on nanosecond and picosecond laser pulse irradiation.6'7 The aim of the work presented here is to elucidate whether the high electronic excitation induced by irradiation with subnanosecond laser pulses can enhance the crystallization process of an amorphous phase.

© 1996 Optical Society of America

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