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Beam profile shaping for laser radars that use detector arrays

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Abstract

The beam shaper we developed shapes the transmit beam of a CO2 laser radar that uses a linear detector array. It consists of a diffraction grating and an anamorphic prism beam compressor and produces a stretched profile that efficiently and uniformly illuminates the far-field footprint of the detector array. The diffraction grating phase modulates the near field or the laser beam to generate a far-field flattop intensity profile, whereas the compressor produces the necessary profile eccentricity. We have achieved conversion efficiencies in the 70–90% range.

© 1982 Optical Society of America

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