Short-pulse light source, laser light emission method, optical device, optical disc device, and optical pickup
AssigneeSony Corporation
InventorsTsutomu Ishimoto, Kazuhiko Fujiie
Life of this patent
Estimating the term…
Abstract
Directed to freely adjusting an emission period of a semiconductor laser. In the present invention, pulsed light serving as pulse-shaped laser light (LL) is emitted from a semiconductor laser (3), and a laser drive voltage (DJ) that is generated on the basis of a pulse signal (SL) and that has pulse-shaped drive voltage pulses (DJw) is applied to the semiconductor laser (3). At this time, a short-pulse light source (51) varies a voltage period (TV) corresponding to an interval between the drive voltage pulses (DJw), thereby varying a set period (TS) corresponding to an interval between generated signal pulses (SLw) in the pulse signal (SL).
Claims17
A short-pulse light source comprising:
- a semiconductor laser configured to emit pulse-shaped laser light;
- and
- a laser control unit configured to, when applying a laser drive voltage having pulse-shaped drive voltage pulses to the semiconductor laser, vary a voltage period corresponding to an interval between the drive voltage pulses.
A laser light emission method comprising:
- varying a voltage period corresponding to an interval between pulse-shaped drive voltage pulses when causing a semiconductor laser to emit pulse-shaped laser light by applying a laser drive voltage having the drive voltage pulses to the semiconductor laser.
An optical device comprising:
- a semiconductor laser configured to emit pulse-shaped laser light;
- and
- a laser control unit configured to, when applying a laser drive voltage having pulse-shaped drive voltage pulses to the semiconductor laser, vary a voltage period corresponding to an interval between the drive voltage pulses.
An optical disc device comprising:
- a semiconductor laser configured to emit pulse-shaped laser light;
- an irradiation unit configured to irradiate an optical information recording medium with the laser light;
- and
- a laser control unit configured to, when applying a laser drive voltage having pulse-shaped drive voltage pulses to the semiconductor laser, vary a voltage period corresponding to an interval between the drive voltage pulses.
An optical pickup comprising:
- a semiconductor laser configured to emit pulse-shaped laser light;
- an irradiation unit configured to irradiate an optical information recording medium with the laser light;
- and
- a laser control unit configured to, when applying laser drive voltage having pulse-shaped drive voltage pulses to the semiconductor laser, vary a voltage period corresponding to an interval between the drive voltage pulses.
Dependencies are inferred from the claim text.