DEVELOPMENT OF A HOLOGRAPHIC ILLUMINATION SYSTEM TO UPDATE A TIME-INTEGRATING CORRELATOR (TIC) WITH A 5000-ELEMENT DETECTOR

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Authors
  1. Beauregard, A.
Corporate Authors
LASIRIS Inc, St-Laurent QUE (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The aim of the work was to design and fabricate a special type of diffraction grating called a "DAMMANN GRATING" to be used as a precision beamsplitter for the illumination of a time-integrating correlator. Dammann gratings are a type of binary phase computer generated holograms with a periodic fringe structure. These gratings have been first proposed by Damman and Gortler as beamsplitters but find a range of other applications. In the context of this work, the gratings had to show a very percise diffraction behaviour. The reconstruction beam, or O order, had to be almost eliminated while the first orders were maximized. The production process for a Dammann grating can be separated in three steps: design of the diffractive structure; recording of the diffractive structure by E-beam; and recording of the Dammann gratings by microlithographic techniques. These three steps are presented in detail in a previous report along with a comparative study of the expected and realized optical performances of the Dammann gratings.
Keywords
Microlithographic techniques;Damman gratings;Binary phase diffraction gratings
Report Number
DREO-CR-93-660 — Technical Report (Final)
Date of publication
01 Aug 1993
Number of Pages
11
DSTKIM No
95-02560
CANDIS No
148361
Format(s):
Document Image stored on Optical Disk;Hardcopy

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