Tunable holographic Fabry-Perot étalon fabricated from poor-quality glass substrates

A novel holographic recording method has been demonstrated for fabricating highly reflectant mirror coatings on a glass substrate of poor surface quality. Electro-optically tunable characteristic fringes of a high-finesse Fabry-Perot étalon have been observed from a cavity consisting of a thin nematic liquid-crystal layer and coated with holographic mirrors. Good agreement has been found between measured values and values predicted by coupledwave theory.