Optical recording method and optical recording apparatus
Disclosed is an optical recording method. The optical recording method includes irradiating an area where a recording mark is formed in a medium with a pulse train of laser light, and irradiating the area where the recording mark is formed with continuous-wave laser light that is continuously output.
1. An optical recording method for forming a recording mark, comprising:
simultaneously irradiating an area of a medium with ultrashort-pulse laser light and continuous-wave laser light;
ending the irradiation with the ultrashort-pulse laser light; and
continuing the irradiation of the area with the continuous-wave laser light after the irradiation with the ultrashort-pulse laser light has ended.
2. The optical recording method according to claim 1 , wherein the ultrashort-pulse laser light is a pulse of a pulse train of laser light.
3. The optical recording method according to claim 1 , wherein the irradiation with the continuous-wave laser light is started after the irradiation with the ultrashort-pulse laser light is started.
4. The optical recording method according to claim 1 , wherein the irradiation with the continuous-wave laser light is started at the same time as the irradiation with the ultrashort-pulse laser light is started.
5. The optical recording method according to claim 1 , wherein the irradiation with the continuous-wave laser light is started before the irradiation with the ultrashort-pulse laser light is started.
6. The optical recording method according to claim 1 , wherein an intensity of the continuous-wave laser light is modulated before the irradiation with the continuous-wave laser light is performed.
7. The optical recording method according to claim 1 , wherein a frequency of the continuous-wave laser light is modulated before the irradiation with the continuous-wave laser light is performed.
8. The optical recording method according to claim 1 , wherein the ultrashort-pulse laser light and the continuous-wave laser light are caused to enter the medium in the same direction on the same axis.
9. The optical recording method according to claim 1 , wherein the ultrashort-pulse laser light and the continuous-wave laser light are caused to enter the medium in opposite directions on the same axis.
10. The optical recording method according to claim 1 , wherein the ultrashort-pulse laser light has a pulse width of a femtosecond or more and 100 picoseconds or less.
11. The optical recording method according to claim 1 , wherein the ultrashort-pulse laser light has a pulse power of 1 kW or less.
12. An optical recording apparatus for forming a recording mark, comprising:
a first laser light source to irradiate an area of a medium with ultrashort-pulse laser light;
a second laser light source to irradiate the area with continuous-wave laser light; and
a controller to control irradiation time periods so that the irradiation with the ultrashort-pulse laser light and the irradiation with the continuous-wave laser light are performed simultaneously, and so that irradiation with the continuous-wave laser light ends after irradiation with the ultrashort-pulse laser light ends.
13. The optical recording apparatus according to claim 12 , wherein the ultrashort-pulse laser light is a pulse of a pulse train of laser light.
14. The optical recording apparatus according to claim 12 ,
wherein the controller controls the timings of the irradiation with the ultrashort-pulse laser light and the irradiation with the continuous-wave laser light so that the irradiation with the continuous-wave laser light is started after the irradiation with the ultrashort-pulse laser light is started.
15. The optical recording apparatus according to claim 12 ,
wherein the controller controls the timings of the irradiation with the ultrashort-pulse laser light and the irradiation with the continuous-wave laser light so that the irradiation with the continuous-wave laser light is started at the same time as the irradiation with the ultrashort-pulse laser light is started.
16. The optical recording apparatus according to claim 12 ,
wherein the controller controls the timings of the irradiation with the ultrashort-pulse laser light and the irradiation with the continuous-wave laser light so that the irradiation with the continuous-wave laser light is started before the irradiation with the ultrashort-pulse laser light is started.
17. The optical recording method according to claim 1 , wherein the continuous-wave laser light is output from a different laser than the ultrashort-pulse laser light.
18. The optical recording apparatus according to claim 12 , wherein the first laser light source is different from the second laser light source.