| 摘要 |
PURPOSE:To stabilize a far field pattern of laser light so that the reflected light through a sensor does not travel into a transparent window, by arranging the sensor in slant when a stem and photosensor fixed with a laser diode chip is contained in a package material having a transparent window. CONSTITUTION:A stem 3 is erected on a flange 2 constituted of metal with good thermal conductivity with a lead 11 projected outside the device, and a laser diode chip 5 is fixed on the side surface on the upper end thereof via a buffer plate 4. Next, the lead 11 passed through the flange 2 is provided on the chip 5 side in the same way. When the photosensor 7 is arranged on the flange 2 being positioned between the lead and chip 5, the following process is taken: a slant surface 13 is provided on the surface of the flange 2 to fix the sensor 7 thereon so that the reflected light 12 by laser light 6 radiating downward from the chip 5 does not invade into the transparent window 10 on the upper end of a cap 8 which is constituted of glass plate 9. |
