Liquid Crystal on Silicon Based Compact Multi-Spectral Scene Projector Technology

ABSTRACT: The proposed effort will perform a feasibility study on developing a multispectral scene projector from 0.4µm to 5µm, using liquid crystal on Silicon (LCoS) spatial light modulators (SLMs). BNS has successfully developed scene projector technology using this approach previously. A modular approach will be considered in which additional spectral band scene projector arms (SPAs) can be integrated into the complete system as required, and in which the assembled system provides simultaneous imaging through a common aperture. The proposed technical evaluation will consider the use of two SLMs in each spectral arm of the system. The first SLM will provide spectral engine functionality in which a spectrally dispersed and focused beam can be amplitude modulated to provide a beam with a detailed target specific spectral signature to a second spatial SLM which generates the scene. The main thrust of the study will be to determine a way to optically integrate spectral information in widely separated spectral bands. Optical modeling and optical material studies will form part of the investigation in addition to the fabrication of polarization optics with dielectric stacks which can provide the necessary functionality from 0.4µm to 5µm. Reflective designs will also be considered. BENEFIT: The Phase I feasibility study will provide a roadmap for the development of a prototype multi-spectral scene generator. The successful development of this technology will have applications in missile and commercial rocket guidance systems, in airborne and satellite based remote sensing ground based calibration, in sensor calibration and in military and civilian personnel training in associated technologies. Additional benefits stemming from the development of spectral engine technology include chemical sensing spectroscopy and display applications.