| 摘要 |
PURPOSE: To provide a small and highly reliable laser coupler applicable to a magnetooptical disk and to provide an optical pickup using the same. CONSTITUTION: In a laser coupler 50, photodetectors 57, 58 are formed on a first semiconductor substrate 51 and a laser diode chip 53 is formed on a second semiconductor substrate 52 mounted on the first semiconductor substrate 51. The surface, on which the PBS film 59 of a half wavelength plate 55 as a polarizing splitter film is formed, is stuck to the first semiconductor substrate 51 and BS 54 composing a composite prism 56 together with the half wavelength plate 55 is mounted on the half wavelength plate 55. The BS 54 has an optical path branching surface for branching the optical path of a laser beam transmitted from the laser diode chip 53 and the laser beam entered into the composite prism 56 from the optical path branching surface is projected on the photodetectors 57, 58 from the surface on which the PBS film 59 of a half wavelength plate 55 is formed. |
