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Proceedings Paper

Mid-Infrared Laser Beam Diagnostic Wavefront Analyzer
Author(s): Rex Goranson; Joe Blea; Art Chipps; Grant Denton; Jeff Houchard
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Paper Abstract

The Rockwell Wavefront Analyzer (RWA) is an integrated beam diagnostic tool developed for the US Army, STEWS, WSMR, for the MIRACL device. It accepts a 2.5 cm square nominally collimated DF laser beam input of approximately 5 W power level. The electrical signals are reduced and analyzed by an on-line computer processor. The ultimate outputs are plots including total beam power and angular jitter in the x and y axes, an irradiance map of the beam on a 32 X 32 square grid, and a wavefront map of the beam on the same grid. Wavefront aberration poly-nomial coefficient listings are also generated. The wavefront is obtained from measurements of its local slope in two axes by means of a classical Hartmann test done by scanning the pupil with holes in a rotating drum. Earlier versions of this instrument we called SHAPE, for Scanning Hartmann Analyzer Plate Experiment. This design would be SHAPE IV. A single indium antimonide photopot detector measures the transverse ray aberrations, which are then subjected to elaborate processing to extract the polynomial wavefront coefficients. Another photopot is the jitter sensor. Each photopot measures power to normalize the X and Y signals; these "Z" signals also provide the beam power and local irradiance signals.

Paper Details

Date Published: 15 August 1988
PDF: 5 pages
Proc. SPIE 0888, Laser Beam Radiometry, (15 August 1988); doi: 10.1117/12.944228
Show Author Affiliations
Rex Goranson, Rockwell Power Services Company (United States)
Joe Blea, Rockwell Power Services Company (United States)
Art Chipps, Rockwell Power Services Company (United States)
Grant Denton, Rockwell Power Services Company (United States)
Jeff Houchard, Rockwell Power Services Company (United States)

Published in SPIE Proceedings Vol. 0888:
Laser Beam Radiometry
Aaron A. Sanders, Editor(s)

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