Optoelectronic Workshops XXV:Liquid Crystal Materials and Devices for Opto-Electronic Applications.

摘要

The workshop was opened by a brief review of the device requirements for an electro-optic element to replace a mechanical chopper for uncooled IR detector arrays. Then the liquid crystal TLSM/IR chopper project was reviewed with recent results. Key highlights presented included the following: (1) A TLSM cell driven by a programmable waveform generator designed and built at UR/LLE was shown to be capable of generating a square-wave optical response with rise and decay times of 500 microsec; (2) A modulation depth of 40% in the 8-12 micrometer region of the infrared was demonstrated in an FTIR experiment using a prototype TLSM/IR chopper; (3) The design and synthesis of a new ferroelectric liquid crystal with the potential for improved transmission in the 8-12 micrometer region was described; and (4) A functional prototype TLSM/IR chopper and programmable waveform generator were delivered to C2NVEO for further characterization and experimentation.