Extremely Narrowband and Cascaded Holographic Adjustable Range Tunable (ENCHART)Filter

摘要

In Phase I, Physical Optics Corporation's RD Division (POC) designed anddeveloped a new Extremely Narrowband Cascaded Holographic Adjustable Range Tunable (ENCHART) filter using two holographic Fabry Perot filters (HFPFs): a coarse filter to select the desired portion of the optical range, and an extremely narrow (0.1 A) bandwidth fine filter operating within this selected range at any arbitrary wavelength. The fine filter is an electrically tuned liquid crystal cell. All established objectives were exceeded and a proof of concept ENCHART prototype was fabricated. This technology was extended to and demonstrated in the violet blue region of the spectrum.