Accession Number : ADD018738

Title :   Interferometric Target Detecting Apparatus Having a Light Source with More Lorentzian Than Gaussian Spectral Components

Descriptive Note : Patent, filed 5 Jan 96, patented 21 Oct 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Swanson, Nancy L

Report Date : 21 Oct 1997

Pagination or Media Count : 14

Abstract : An apparatus for eliminating scattered light from unscattered light (signal) in the reflection from a laser-illuminated target and its ambient. The apparatus uses a laser selected for maximum Lorentzian to Gaussian mode content, a stable interferometer having an optical path difference twice the distance to the first zero in the Gaussian pattern of the scattered interferogram, and performs subtraction of the background or scattered interferogram from the unscattered or signal interferogram. The laser is multi-mode and the interferometer is a Fizeau wedge having an optical path difference equal to twice the distance to the first zero in the Gaussian interferogram. The method of making the apparatus is provided.

Descriptors :   *OPTICAL INTERFEROMETERS, *LASER APPLICATIONS, *PATENTS, LIGHT SCATTERING, LASER BEAMS, COHERENT OPTICAL RADIATION, INTERFEROGRAMS, TARGET DETECTION, FOCAL PLANES, ARGON LASERS, PHOTODIODES, OPTICAL FILTERS

Subject Categories : Lasers and Masers
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE