Flexible Bandwidth Holographic Filter

Period of Performance: 04/10/1998 - 10/10/1998

$100K

Phase 1 SBIR

Recipient Firm

Physical Optics Corp.
1845 West 205th Street Array
Torrance, CA 90501
Principal Investigator

Research Topics

Abstract

Physical Optics Corporation (POC) proposes to develop a Flexible Bandwidth Holographic Filter (FBHF) based on tunable holographic filter elements. The FBHF will be compact and lightweight, with high optical density (OD>5) and tunable center wavelength and pass bandwidth. This new filter approach is based on the unique integration of a pair of Raman holographic edge filters (RHFs). Which are proprietary POC broadband holographic filters characterized by high optical density, narrow slope, and absence of ripple or sidelobes in the passband. Using two RHFs with overlapping bands, the filter center wavelength can be scanned from ~10nm to 100nm by independently varying the tilt angles of the RHFs. As a transmissive device, the proposed FBHF can be integrated into existing hyperspectral imaging sensor systems essentially without modification. Specifically, when placed in front of a standard broadband diffraction grating the FBHF forms a flexible dispersive element of a sort needed in many airborne remote sensing systems.