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Optical Engineering

Laser Beam Profile Measurements
Author(s): Jack D. Frank
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Paper Abstract

Three instruments used at Hughes Aircraft Company for making laser measurements are described. Two of the three instruments employ the conventional aperture technique for measuring beam divergence and use the aperture spatial location as the geometrical center of the beam. The third instrument measures the beam profile with a diode matrix array, and the laser signal amplitude on each pixel is processed by firmware to determine the centroid, beam divergence, energy, and the angular misalignment relative to the optical line of sight. A comparison between measurements made by the aperture technique and the new diode matrix array system shows the beam divergence values were within one percent. Measurement accuracy considerations made when designing a laser test system are dependent on the dynamic range. The detector array method permits single pulse analysis, multiple pulse averages, and storage of pulse data. It also permits quantitative evaluation of laser pulse-to-pulse parameter changes during the initial laser firing period.

Paper Details

Date Published: 1 January 1986
PDF: 10 pages
Opt. Eng. 25(1) doi: 10.1117/12.7973790
Published in: Optical Engineering Volume 25, Issue 1
Show Author Affiliations
Jack D. Frank, Hughes Aircraft Company (United States)


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