As spacecraft missions increase in scope and duration, the need for established focal planes to fulfill these mission requirements increases proportionally. The visible hybrid HAWAII-2RG (HgCdTe Astronomy Wide Area Infrared Imager with 2k x 2k resolution, reference and guide mode) has a venerable terrestrial-based telescope history. These focal planes are considered candidates for space applications. As a candidate focal plane, the responses of the HAWAII-2RG under nominal operating conditions in an ionizing debris gamma environment are discussed. Measurements in dark current frame captures and voltage bias currents are delineated.
Liquid crystal spatial light modulators are emerging as a potential replacement to traditional optical beam steering methods. The performance of these devices for optical communication systems in the radiation environment for geostationary orbits (GEO) are of interest for applications in the next generation of satellites. As an initial investigation to the study presented, several liquid crystals were irradiated to total dose levels consistent with expected GEO environments. While prior irradiation work has been done on spatial light modulators none is known to include a first look at a liquid crystal and CMOS backplane. Parameters of retardation, contrast ratio and primary power current were monitored at incremental stages during the test and are presented.
A brief report on an ongoing study concerned with the responses of acousto-optic modulators (AOMs) and deflectors (AODs) exposed to linearly accelerated electrons, gamma rays, and X rays is presented. The diffracted spatial intensities of PbMoO4, TeO2, and InP devices were observed to undergo displacements and attenuation. Discussions of radiation- induced temperature gradients and color center formation believed to be responsible for these effects are included.
The exposure of birefringent guided wave devices to ionizing radiation can result in nonequivalent signal attenuations over the eigenmode axes and to highly interactive crosstalk between the coupled waveguides. This paper discusses the response of polarization maintaining (PM) fibers and directional coupler waveguides exposed to accelerated electrons, and reports on advances made in delineating and understanding the response mechanisms involved.
Optical guided wave devices can experience crosstalk and mode-switching in the presence of ionizing radiation. This paper discusses the response of LiTaO3 and LiNbO3:Ti directional coupler waveguides to exposures of linearly accelerated electrons. A comparison of the waveguides in terms of sensitivity to the ionizing radiation is made.
Conference Committee Involvement (3)
Photonics for Space Environments XI
14 August 2006 | San Diego, California, United States
Photonics for Space Environments X
1 August 2005 | San Diego, California, United States
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