Optical: systems and elements – Optical amplifier
Reexamination Certificate
2005-04-26
2005-04-26
Moskowitz, Nelson (Department: 3663)
Optical: systems and elements
Optical amplifier
C359S285000, C359S305000
Reexamination Certificate
active
06885497
ABSTRACT:
A single-ended laser device for locating reflective targets within a given surveillance volume, said apparatus comprising:a body of material excitable to emit electromagnetic radiation at frequencies within a characteristic fluorescence peak, said body having an effective exit aperture;a single retro-reflective member having an optic center and positioned to receive radiation from said body and to redirect said radiation into said surveillance volume through said effective exit aperture of said body, said effective aperture being oppositely disposed on said body from said single member, said single member cooperating with said body to form a field of view within said surveillance volume substantially equal to the solid angle defined by the square of the length of a line joining said optic center of said single member with the center of said effective exit aperture divided into the area of said exit aperture transverse to said line;means for exciting said body to an energy level substantially equal to the threshold for establishing oscillation of stimulated radiation between said single member and a reflective target located a preselected maximum distance from said single member to cause said body to broadcast fluorescent radiation throughout said field of view, whereby a resonant beam of stimulated radiation will be established between said single member and a reflective target located anywhere within said field of view at not more than said maximum distance and which is oriented to receive radiation from said body and to redirect said radiation through said body to said single member; andmeans for indicating establishment of said resonant beam.
REFERENCES:
patent: 3111587 (1963-11-01), Rocard
patent: 3292102 (1966-12-01), Byrne
patent: 3353115 (1967-11-01), Maiman
Gurs,Das Schwingungsver-halten von optischen Rubin-Masern mit grossem spiegelabstand, in Z. Naturforschg, vol. 17A, Nov. 1962, Q3Z4, pp 990-993 relied on.
Lockheed Martin Corporation
Moskowitz Nelson
Sadacca Stephen S.
Sidley Austin Brown & Wood LLP
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