Accession Number : ADD016523

Title :   Nonlinear Frequency Conversion Optical Filter.

Descriptive Note : Patent, Filed 20 Sep 93, patented 16 Aug 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Boczar, Bruce P

Report Date : 16 Aug 1994

Pagination or Media Count : 7

Abstract : The present invention is a method and system for performing optical filtering. Light energy in one frequency band is received in this system. The received light energy is filtered in one frequency band in order to provide filtered light which is applied to a nonlinear optical device. The nonlinear optical device provides frequency conversion preferably by forming a sum frequency or difference frequency. The frequency converted light energy is in a second frequency band. The energy in this second frequency band is applied to a further filter in a different frequency band wherein the two filter frequency bands are selected to prevent light energy from passing through both filters. The received light energy may contain information which is recoverable from the light energy which passes through the second filter. The nonlinear device is a crystal in which the index of refraction may be changed in order to tune the filter.

Descriptors :   *PATENTS, *OPTICAL FILTERS, *NONLINEAR OPTICS, CRYSTALS, DIFFERENCE FREQUENCY, ENERGY, FREQUENCY BANDS, FREQUENCY CONVERSION, LIGHT SCATTERING, LASER BEAMS, REFRACTION, OPTICAL RADAR

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE