Pyroelectric vidicon with improved resolution

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Abstract
Targets (30 μm thick) of single-crystal triglycine sulfate (TGS) have been routinely fabricated for pyroelectric vidicons. However, image resolution is limited by lateral thermal diffusion, resulting in crosstalk between adjacent areas in the TGS. A method has been developed for reducing this thermal diffusion by photolithographically reticulating the TGS into small islands and thereby improving the resolution. The reticulated TGS is supported by thinned arsenic trisulfide (As2S3), a substrate having low thermal diffusivity and being transparent to radiation in the 8–14 μm region. Comparing the minimum resolvable temperature (MRT) vs. spatial frequency for a single-crystal TGS tube and for a reticulated TGS tube, one finds that at 5 lp/mm, the MRT is improved by more than a factor of three in the case of the reticulated target.

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