Abstract

Optothermal optically nonlinear interference filters (NLIFs) have been exploited as bistable switches for some years [1-3]. Recently we have developed an electron-beam tuned interference filter spatial light modulator (ETIF-SLM) based on such nonlinear devices [4]. A number of ETIF-SLM devices have been made for operation at 514 nm and 633 nm wavelengths. They were based on standard, Thorn-EMI type 8541, vidicon tubes which had, in place of the photo-cathode, the NLIF deposited on the inside surface of the faceplate prior to sealing onto the vacuum tube. The NLIFs incorporated ZnSe spacers and were matched by a λ/4 TiO₂ layer into an optically opaque Si layer and the final top layer was ~ 100 nm of Al added to provide a return current path. For these initial studies the e-beam power was increased by opening the gun aperture to give 0.1 - 1 mA of beam current and the target voltage set to 500 V - 1 kV - providing 100 mW to 1 Watt of e-beam power.

© 1988 Optical Society of America