Mr. Sean D. Keller Profile

Sean D. Keller

at Raytheon

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Proceedings Article | 11 March 2015 Paper

Emerging liquid crystal waveguide technology for low SWaP active short-wave infrared imagers

Sean Keller, Gerald Uyeno, Ted Lynch, Scott Davis, Scott Rommel, Juan Pino

Proceedings Volume 9384, 93840M (2015) https://doi.org/10.1117/12.2076835

KEYWORDS: Liquid crystals, Waveguides, Scanners, Short wave infrared radiation, Imaging systems, Camera shutters, Sensors, Geometrical optics, Infrared radiation, Cameras

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Raytheon’s innovative active short wave infrared (SWIR) imager uses Vescent Photonic’s emerging liquid crystal waveguide (LCWG) technology to continuously steer the illumination laser beam over the imager field of view (FOV). This approach instantly illuminates a very small fraction of the FOV, which significantly reduces the laser power compared to flash illumination. This reduced laser power directly leads to a reduction in the size, weight and power (SWaP) of the laser. The reduction in laser power reduces the input power and thermal rejection, which leads to additional reduction in the SWaP of the power supplies and thermal control. The high-speed steering capability of the LCWG enables the imager’s SWaP reduction. The SWaP reduction is possible using either global or rolling shutter detectors. In both cases, the LCWG steers the laser beam over the entire FOV while the detector is integrating. For a rolling shutter detector, the LCWG synchronizes the steering with the rolling shutter to illuminate only regions currently integrating. Raytheon’s approach enables low SWaP active SWIR imagers without compromising image quality. This paper presents the results of Raytheon’s active SWIR imager demonstration including steering control and synchronization with the detector integration.

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