Amorphization induced by subnanosecond laser pulses in phase-change optical recording media.
We have investigated the dynamics of amorphization induced in phase-change optical recording media by focused laser pulses of subnanosecond duration. We initiated localized amorphism by using a focused laser beam to melt the phase-change material and completed the change by rapid cooling by means of thermal diffusion. These studies were conducted by use of real-time reflectivity measurements with a pump-and-probe technique in which both pump and probe pulses had a duration of approximately 510 ps. Our transient-reflectivity measurements indicate that the process that leads to amorphism has three distinct stages, namely, rapid melting, solidification, and slow relaxation.
Peng
Chubing
C
Optical Sciences Center, University of Arizona, Tucson, Arizona 85721, USA. chubing.peng@seagate.com
Mansuripur
Masud
M