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Proceedings Paper

Nonlinear optical crystal development for laser wavelength shifting at AFRL Materials Directorate
Author(s): Nils C. Fernelius; Frank Kenneth Hopkins; M. C. Ohmer
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Paper Abstract

Our objective is to develop crystals that shift the light from well developed laser sources to application specific wavelengths which may be tunable. Military applications extend across the entire spectrum from ultraviolet through the far-infrared but our greatest interest has been in materials for the mid-IR (3-5 μm) and far-IR (8-12 μm) atmospheric windows. Our primary applications that drive crystal development are infrared countermeasures and remote sensing of chemical and biological warfare agents. To achieve these results we have pursued two tracks: birefringent bulk materials and quasi-phase-matched structures. Birefringent studies include the grey track problem in KTiOPO4 (KTP) plus growth of its isomorphs, KTIOAsO4 (KTA), RbTiOAsO4 (RTA), CsTiOAsO4 (CTA), and KxRb1-xTiOPO4 (KRTA); chalcopyrites: ZnGeP2, CdGeAs2, AgGaS2, AgGaSe2, AgGa(1-x)InxSe2, AgGaTe2; plus GaSE, and HgGa2S4. A small portion of the effort is pursuing UV materials, the foremost being the borates MM'(B3O5)3 where M=Sr, Ba, Pb; M'=Li,Na. Previously, work was done on LiB3O5 (LBO), β-bonding (GaAs), by periodic poling (LiNbO3, LiTaO3, KTP, BaTiO3) and by periodic doping. Th cover the 4.5-5.0 μm band, work is being done on RTA and Pb{MgxNbyTi1-x-y}O3 (PMNT). For periodic poling in the 8-12 μm region studies are being made on CGC (CsGeCl3), CGB (CsGeBr3), Tl3PbBr5, Tl4PbI6 and Tl4HgI6. QPM can also be obtained using total internal reflection devices (GaAs, ZnSe).

Paper Details

Date Published: 28 June 1999
PDF: 7 pages
Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); doi: 10.1117/12.351399
Show Author Affiliations
Nils C. Fernelius, Air Force Research Lab. (United States)
Frank Kenneth Hopkins, Air Force Research Lab. (United States)
M. C. Ohmer, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 3793:
Operational Characteristics and Crystal Growth of Nonlinear Optical Materials
Ravindra B. Lal; Donald O. Frazier, Editor(s)

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