Entity

Time filter

Source Type

Sweet Home, NY, United States

Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 80.00K | Year: 1995

N/A


Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 746.40K | Year: 1996

Electro-optic materials with large optical nonlinearities (electrooptic coefficients) and high thermal and temporal stabilities are crucial components in many photonics applications. Organic and polymeric NLO materials are excellent candidates for these applications. Current materials experience a dielectric relaxation of the aligned structure which prevents them from being used in practical devices. The design and synthesis of a new class of second-order nonlinear optical polymers with large molecular nonlinearities, increased processabilities and exceptional thermal, temporal and photochemical stabilities are proposed. The second-order chromospheres are designed to possess an arylamine structure, the use of which not only increases their molecular nonlinearities, but also dramatically improves their thermal stabilities. These chromospheres are then covalently attached to a high glass transition temperature polyimide backbone. During the electric field poling process, the polymers undergo crosslinking reaction through which additional resistance to chromosphere dipolar relaxation is achieved.


Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 99.99K | Year: 1996

Electrooptic (EO) materials with large optical nonlinearities (electrooptic coefficients) and high thermal and temporal stabilities are crucial components in many photonics applications for aircraft avionics systems. Although polymeric NLO materials are excellent candidates for these applications, current materials experience dielectric relaxation of the aligned structure which prevents them from being used in practical devices. Laser Photonics Technology, Inc. proposes the development of a new class of second-order NLO ionic polymers with large nonlinearities, and exceptional thermal, temporal and photophysical stabilities. The second-order NLO chromophores are designed to possess a zwitterionic structure enhancing molecular hyperpolarizability that is obtained through the use of novel sultone chemistry. These chromophores are then covalently attached to a high glass transition temperature polyimide backbone. Ionic structures have been shown to exhibit large B values, but their alignment by electric field poling has been complicated (hindered) by Coulombic (repulsive) interactions. The proposed approach circumvents these problems because ionic structures are formed only during the high temperature poling process. It thus ensures the ease of material processing, effectiveness of electric field poling and great thermal stability of induced noncentrosymmetry.


Grant
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase I | Award Amount: 70.00K | Year: 1996

N/A


Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 750.00K | Year: 1998

The highly directional properties of lasers makes them effective weapons when they are directed at the human retina or other sensitive detectors. Lasers are becoming increasingly more reliable, smaller and of lower cost. The recent introduction of practical low-cost tunable lasers circumvents any simple effort to obtain protection by using simple filters. The proposed polymers will contain one or more covalently attached ligands that work cooperatively to transfer charge between them (birchromophore). The net effect is to convent a virtually transparent polymer into a highly absorbing one. An extremely large change in absorption has been demonstrated in solution by chemically reacting similar species with strong oxidants. Our goal I this effort is to prepare a class of polymers containing donor species (strong absorbers) with one or more charge acceptors to facilitate a rapid and reversible absorption change which would protect human eyesight or other sensitive detectors. This approach can utilize different donors and acceptors can utilize can be used to obtain broadband protection. The Workplan involves the synthesis of several polymers followed by their chemical an optical characterization. LPT will make a special effort to develop a structure-function relationship using computational and measurement techniques.

Discover hidden collaborations