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Proceedings Paper

Effect of speckle on coherent and incoherent Doppler lidar
Author(s): Kenneth W. Fischer; Wilbert R. Skinner
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Paper Abstract

Doppler lidars can be separated into two main categories by the detection technique used, coherent or incoherent. This paper focuses on the differences between the two types of Doppler lidar and the effect of speckle on each. Coherent Doppler lidars make use of a local oscillator heterodyning system similar in principle to a Doppler radar to determine Doppler shift while incoherent lidars typically use an interferometric technique to resolve the small spectral shift. The effect of laser speckle on lidar measurements in general has become a topic of great interest in recent years because in many cases it limits the ultimate resolution or accuracy of the measurement. In the case of Doppler lidars, speckle has very different effects on coherent and incoherent Doppler detection systems. Due to the single-shot nature of coherent lidar measurements and the narrow field of view required, many shots of data are lost due to speckle. The larger fields of view used for incoherent Doppler lidar as well as the inherent multiple pulse averaging make speckle significantly less of a problem for these systems.

Paper Details

Date Published: 10 February 1995
PDF: 9 pages
Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); doi: 10.1117/12.205579
Show Author Affiliations
Kenneth W. Fischer, Environmental Research Institute of Michigan (United States)
Wilbert R. Skinner, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 2366:
Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements
Michael G. Yost; Dennis K. Killinger; Joseph Leonelli; William Vaughan; Dennis K. Killinger; William Vaughan; Michael G. Yost, Editor(s)

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