The optical pickup apparatus 100 uses a semiconductor laser element 50 integrated a first light emission source 36 for emitting a first laser beam with a second light emission source 40 for emitting a second laser beam, of which wavelength is different from that of the first laser beam. An operating knob is connected an operating lever and to a connecting link through a U-shaped pin. Various thicknesses and materials for use in the different layers are disclosed and are particularly useful for metallization in implantable electronic devices such as neural electrode arrays.