Opportunity at Air Force Research Laboratory (AFRL)
Infrared Optical Material Development
Materials & Manufacturing, RX/Photonic Materials
||Wright-Patterson AFB, OH 454337817
Strong third order nonlinear optical performance is demonstrated by many materials in the infrared (IR), including narrow and mid-bandgap semiconductors in the bulk form. Our overall goal is to understand and optimize the nonlinear optical properties of these materials through theoretical and experimental studies involving IR laser beams in different wavelength and pulse duration regimes. Currently, the IR materials project includes the development of materials, versatile characterization of materials properties, and detailed understanding of materials properties through modeling. The materials being developed include novel semiconductor alloys in crystalline or glassy forms and thermochromic materials. A variety of laser systems are used to characterize the materials including CO, CO2, and IR HeNe lasers. Characterization is performed at cryogenic and ambient temperatures. The characterization effort also includes the measurements of the decay rates of the optical nonlinearities. The modeling effort includes semiconductor material modeling, as well as laser beam propagation modeling with the eventual goal of combining the two efforts to obtain complete information about the laser-material interaction. Laser beam propagation modeling presents challenges for fast optical systems-especially when aberration of lenses have to be taken into account-and for propagation through multiple linear and nonlinear optical elements. We are solving different aspects of the problem using different techniques, such as the finite difference method, Hankel transform method, Lanczos orthogonalization, split step method, and Huygens-Fresnel propagation formalism.
Short duration infrared lasers; Charge transport dynamics in semiconductors; Infrared lasers; Infrared materials; Laser beam propagation studies; Small band gap materials; Thermochromic materials; Third order nonlinearities;
Open to U.S. citizens
Open to Postdoctoral and Senior applicants