Phase change device having phase change recording film, and phase change switching method for phase change recording film
AssigneesNational Institute of Advanced Industrial Science and Technology, University of Tsukuba
InventorsMuneaki Hase, Kotaro Makino, Junji Tominaga
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Abstract
Allow the rate of phase change to be controlled at the time period of phonons (approx. 270 fs) for the purpose of achieving a substantially higher recording-erasing speed compared to what can be achieved with conventional technologies relating to optical recording media using phase change. A femtosecond pulse laser is shaped into pulse trains each having a first pulse and a second pulse using a Michelson interferometer, and the time interval of first and second pulses is matched with the time period of lattice vibration of a material constituting the phase change recording film to be irradiated, thereby inducing phase change.
Claims20
A phase change device having phase change recording film, which comprises a phase change recording film and a means for feeding and irradiating a femtosecond pulse laser onto the phase change recording film;
- said phase change device having phase change recording film characterized in that the means is configured to split one femtosecond laser pulse into pulse trains each having multiple pulses and to irradiate the pulse trains by matching a time interval of the pulse trains with a time period of lattice vibration of a material constituting the phase change recording film, thereby inducing phase change in the phase change recording film.
A phase change device having phase change recording film, which comprises a phase change recording film and a means for irradiating a femtosecond pulse laser onto the phase change recording film;
- said phase change device having phase change recording film characterized in that the means is configured to split one femtosecond laser pulse into pulse trains each having a first pulse and a second pulse and irradiate the pulse trains by matching a time interval of the first and second pulses corresponding to a time interval of the pulse trains with a time period of lattice vibration of a material constituting the phase change recording film, thereby inducing phase change in the phase change recording film.
A phase change switching method for causing phase change in a phase change recording film by irradiating a femtosecond pulse laser onto a phase change recording film;
- said phase change switching method for causing phase change in a phase change recording film characterized in that one femtosecond pulse is split into pulse trains each having multiple pulses and the pulse trains are irradiated by matching a time interval of the pulse trains with a time period of lattice vibration of a material constituting the phase change recording film, thereby inducing phase change in the phase change recording film.
A phase change switching method for causing phase change in a phase change recording film by irradiating a femtosecond pulse laser onto a phase change recording film;
- said phase change switching method for causing phase change in a phase change recording film characterized in that one femtosecond pulse is split into pulse trains each having a first pulse and a second pulse and the pulse trains are irradiated by matching a time interval of the first and second pulses corresponding to a time interval of the pulse trains with a time period of lattice vibration of a material constituting the phase change recording film, thereby inducing phase change in the phase change recording film.
Dependencies are inferred from the claim text.