| 摘要 |
An optical disk drive has an aberration detector (36, 40, 42) and an aberration correction circuit (47). A semiconductor laser device made of semiconductor crystals constituting a semiconductor laser light source (30) includes an active layer (3) for performing light amplification through current injection and guiding light in waveguide, a reflection member for reflecting light into said active layer, and a top electrode and a bottom electrode (11) used for current injection to the active layer, wherein the top electrode is divided into a main electrode (12) and a plurality of subsidiary electrodes (13, 14), and injection current to the subsidiary electrodes is controlled so as to correct an aberration generated at an optical focussing system (30, 31, 32, 33, 34) and an optical disk (35). <IMAGE> |
