Abstract: The fire extinguishing and smoke eliminating apparatus using water mist, including a water mist nozzle for spraying fine water particles with a designated particle diameter suitable for smoke generated from different types of objects existing in a section indicating a designated range of a fire extinguishing and smoke eliminating object or different types of smoke itself.

Abstract: A semiconductor laser module comprises a semiconductor laser device, an optical fiber, and a lens for coupling light emitted from the semiconductor laser device to the optical fiber. There is provided a metal base having a flat portion and a pipe portion in a metal case. The semiconductor laser device is mounted on a chip carrier which is mounted on the flat portion of the metal base. The lens is fixed in the inside of the pipe portion of the metal base. The optical fiber is protected at one end by a ferrule which is fixed to the pipe portion of the metal base. A device such as a monitor photodiode and a thermistor may be mounted on the flat portion of the metal base. The flat portion of the metal base may be formed with a concave portion of an area smaller than an area of the bottom of the chip carrier.