Gte Laboratories Incorporated

Polaroid-corporation-patent Department

Bill C McCollum

Alexander Lempicki

Leonard J Andrews

Richard P Tumminelli

Robert J Mansfield

Peter T Kenyon

A chemical vapor deposition method which utilizes a rare earth chelate vapor as a source of rare earth ions for producing an optical fiber having a core with a high rare earth content.

Method for fabricating optical fibers having cores with high rare earth

A laser medium containing a chromium (3+) doped germanate garnet represented by the general formula: Ca.sub.3 M.sub.2(1-x) Cr.sub.2x (GeO.sub.4).sub.3 wherein M is Al.sup.3+, Ga.sup.3+, Sc.sup.3+, Lu.sup.3+, or Y.sup.3+ and 0&lt;x.ltoreq.0.25 is disclosed. A laser employing the above-described laser medium is also described.

Chromium (3+) doped germanate garnets as active media for tunable solid

A laser medium includes an ordered perovskite crystal of the general formula: A.sub.2 B Cr.sub.y B'.sub.1-y X.sub.6. A and B are alkali metal ions with the ionic radius of A greater than B. B' is an ion selected from the group consisting of Y.sup.3+, La.sup.3+, Gd.sup.3+, Lu.sup.3+, Sc.sup.3+, Al.sup.3+, Ga.sup.3+, and In.sup.3+. X is an ion selected from the group consisting of F.sup.-, Cl.sup.-, and Br.sup.-. A can be an ion selected from the group consisting of K.sup.+, Na.sup.+,Cs.sup.+, and Rb.sup.+. B can be an ion selected from the group consisting of K.sup.+-, Na.sup.+, and Li.sup.+. The chromium can be represented by Cr.sup.+3 ions. The laser media can be ordered perovskite polycrystalline compounds of the formulae: CsNaCr.sub.0.01 Y.sub.0.99 Cl.sub.6 ; KLi Cr.sub.y Sc.sub.1-y F.sub.6 (where y equals 0.01 and 0.10); K.sub.2 NaCr.sub.y Sc.sub.1-y F.sub.6 (where 0.01 .ltoreq.y.ltoreq.0.40). A laser can include an optical resonant cavity defined by a first totally reflective mirror and a second partially transmissive mirror. Within the cavity is an active laser medium comprising an ordered perovskite crystal of the general formula stated above, and may be of a specific formula as stated above. An optical pumping means is disposed adjacent to the optical cavity for exciting the laser medium to stimulated radiation. The mirrors are provided with reflective coatings on opposite surfaces of the active laser medium.

Chromium (III) ordered perovskite lasers and media therefor

A high gain stoichiometric neodymium laser medium of the general formula K.sub.5 Nd.sub.x M.sub.(1-x) Li.sub.2 F.sub.10 where x takes on a non-zero positive value less than or equal to one, and M is a metal selected from the group consisting of lanthanum, cerium, and gadolinium. Minilasers employing a laser medium of the general formula K.sub.5 Nd.sub.x M.sub.(1-x) Li.sub.2 F.sub.10 are provided in which the optical pumping is provided by at least one light emitting diode or laser diode.

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Marlborough, MA, United States of America

Bill C McCollum