Patent ID: 8672513

Claim:
A method of using a laser lighting apparatus for fire rescue navigation in a smoke-filled structure, comprising: carrying said laser lighting apparatus at a user's body when operating the device, wherein said laser lighting apparatus being directly operated by the user; turning the laser lighting apparatus on to output one or more coherent light planes; projecting the one or more coherent light planes on objects in the smoke-filled structure to produce one or more light stripes on surfaces of the objects; identifying the objects in the smoke-filled structure from the one or more light stripes; the laser lighting apparatus includes a diffraction grating and only one laser diode; the diffraction grating diffracts a laser beam emitted by the laser diode to generate the one or more coherent light planes; the diffraction grating is a multiline diffraction grating that is composed of multiple diffraction gratings parallel to each other; and the one or more coherent light planes are green or blue light.