Accession Number : ADA309961

Title :   Single Crystal Films and Waveguides of Organic Materials: Preparation and Nonlinear Optical Properties.

Descriptive Note : Final rept. Apr 93-Mar 96,

Corporate Author : AUBURN UNIV AL

Personal Author(s) : Thakur, M.

PDF Url : ADA309961

Report Date : 24 MAY 1996

Pagination or Media Count : 8

Abstract : The objective of this program includes establishment of a generic method for the growth of single crystal films of important organic materials and measurement of their nonlinear optical properties. In the last three years we have developed a method which is a modification of the 'shear method' to prepare single crystal films of specific organic materials having very large second order nonlinearities. This is the first time that single crystal thin films of these organic materials have been prepared. The materials investigated include: (1) (N-(4-Nitrophenyl)-L-prolinol) (NPP), (2) (2-cyclooctylamino-5-nitropyridine), (COANP), (3) (8-(4'-acetylphenyl)-1,4-dioxa-8-azspiro4,5decane), (APDA) and (4) (4'-N,N-dimethylamino-4-N-methylstilbazolium toluene-p-sulfonate), (DAST). The single crystal films obtained for these materials have excellent optical quality and large areas (5 sq mm -2/sq cm depending on material). The films were characterized by x-ray diffraction, polarized FTIR, optical absorption and optical microscopy. The second order susceptibilities were measured and very large d-coefficients were observed. Electro-optic measurements have shown extremely large E-O coefficients. The off-resonant nonlinear refractive index of polydiacetylene was measured and picosecond all-optical switching at a high pulse repetition rate (82 MHz) was demonstrated for the first time.

Descriptors :   *THIN FILMS, *SINGLE CRYSTALS, *WAVEGUIDES, *NONLINEAR OPTICS, *ORGANIC MATERIALS, SHEAR PROPERTIES, MEASUREMENT, OPTICAL PROPERTIES, REPETITION RATE, ELECTROOPTICS, METHYL RADICALS, POLYMERS, X RAY DIFFRACTION, FILMS, MICROSCOPY, PULSE RATE, OPTICAL ANALYSIS, RADIATION ABSORPTION, COEFFICIENTS, SULFONATES, ACETYLENE, OPTICAL SWITCHING, PHENYL RADICALS, PYRIDINES, NITRO RADICALS, TOLUENES, DECANES.

Subject Categories : Organic Chemistry
      Crystallography
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE