The gas detection method according to a laser diode device and a laser diode device with a temperature controlled beam-forming member

摘要

PROBLEM TO BE SOLVED: To provide a laser diode structure that improves sensitivity of detection of a gas by reducing interference of a laser beam.;SOLUTION: The laser diode structure 1 for use in gas detection includes a hermetically sealed casing 2 having an electric coupling portion 3, a bottom portion 4 and a window 5. A laser diode chip 6 and temperature control portions 9, 12 for the chip are provided in the casing 2. A thermoelectric element 12 serving as a Peltier element as a part of the temperature control portions is coupled to the bottom portion 4 of the casing 2 through a bottom surface 13, and coupled to the laser chip 6 through an upper surface 11. A temperature-controlled beam shaping member 14 which is provided between the diode chip 6 and window 5 and dims the laser beam 7, emitted from an opening of the laser diode chip 6, in parallel before the laser beam 7 passes through the window 5. The beam shaping member 14 in contact with the laser diode chip 6 is preferably in surface-to-surface contact with or bonded to the opening 8 through its boundary surface 16, or formed integrally with the opening 8.;COPYRIGHT: (C)2011,JPO&INPIT