Speckle reduction in CO2 heterodyne laser radar systems

Peter Lutzmann; Reinhard R. Ebert

doi:10.1117/12.20554

1 October 1990 Speckle reduction in CO2 heterodyne laser radar systems

Peter Lutzmann, Reinhard R. Ebert

Proceedings Volume 1276, CO2 Lasers and Applications II; (1990) https://doi.org/10.1117/12.20554
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

A limitation of heterodyne C02-laser radars results from the statistical properties of speckle effects. Suppression of speckle influence by adding uncorrelated speckle pattern was experimentally studied. Using a space separation technique involving a quadrant detector allows to 'look' at different parts of the laser spot on the target at the same time. By choosing the proper diameter of the receiver optics nearly uncorrelated signals are seen with the four detector elements. The signal statistics was measured for direct and heterodyne detection. The achieved improvement in the signal probability distribution and in the contrast were compared with theory. The measurements were done with both a laboratory setup and with the Ff0 Laser-Radar-System BASIS 2.

Citation Download Citation

Peter Lutzmann and Reinhard R. Ebert "Speckle reduction in CO2 heterodyne laser radar systems", Proc. SPIE 1276, CO2 Lasers and Applications II, (1 October 1990); https://doi.org/10.1117/12.20554

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