Laser rangefinders

Details Laser rangefinders Laser rangefinders

G - Physics

01

C

343/6

G01C 3/00 (2006.01)

Patent

CA 1087285

Abstract of the Disclosure A laser rangefinder includes a first laser arranged for the irradiation of a given target, means for providing the first laser with a pulsed output, an optical mixing crystal arranged for the reception of radia- tion reflected from the first laser by the target, a second laser arranged for the irradiation of the optical mixing crystal, means for providing the second laser with a pulsed output during the period in which radiation from the first laser is expected to be incident on the optical mixing crystal after reflection by the target, wherein the optical mixing crystal, the frequency of the radiation output from the first laser and the frequency of the radiation output from the second laser are such as to allow a three-wave phase matching up-conversion process to occur, and means for detecting the time interval between the emission of a given part of the radiation output from the first laser and the production in the optical mixing crystal of an optical signal constituting up-conversion of the said part of the radiation output from the first laser after reflection by the target to the optical mixing crystal. The first laser may be a carbon dioxide laser which may be Q-switched. The second laser may be a dye laser. The optical mixing crystal may be Ag3AsxSb1-xS3, 0?x?1 or Ag Ga S2.

167545

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