An optoelectronic device that provides an excellent reproduction signal and a stable servo control while preventing deterioration of S/N ratio caused by stray light. The optoelectronic device has a semiconductor laser (101) that emits light beams on an information-recording medium (105), a hologram optical...http://www.google.de/patents/US7064898?utm_source=gb-gplus-sharePatent US7064898 - Optoelectronic device
