Measurements of beam parameters with 2D matrix camera arrays

Bernd Eppich

doi:10.1117/12.259917

20 November 1996 Measurements of beam parameters with 2D matrix camera arrays

Bernd Eppich

Proceedings Volume 2870, Third International Workshop on Laser Beam and Optics Characterization; (1996) https://doi.org/10.1117/12.259917
Event: Third International Workshop on Laser Beam and Optics Characterization, 1996, Quebec City, Canada

Abstract

The accuracy in the measurement of beam parameters based on irradiance moments using CCD cameras and other matrix detectors has been the subject of several experimental investigations and round robin experiments. It turned out that the obtainable accuracy depends strongly on the detector system (signal-to-noise ratio, resolution) and on properties of the power density distributions to be measured. It is known that the width of slow decaying distributions (e.g. the far field of unstable resonators) is more difficult to be measured than the width of steep decaying distributions (as top-hat fields and super-Gaussian profiles) and that the measurement error increases with the size of the integration area. It has also been recognized that the determination of the offset level might be crucial for accurate results. But all of this knowledge is rather qualitative. In this paper we deduce analytically the obtainable accuracy in measuring moment based parameters as of function of the crucial parameters of the detector and the signal (the power density distribution). The statistical noise of the matrix detectors is assumed to be the fundamental cause of the finite accuracy, though there are some more potential sources of errors. Thus only an estimation of the lower bound of the obtainable accuracy will be given. When measuring beam parameters these results may be used to estimate the accuracy of the measured values.

Citation Download Citation

Bernd Eppich "Measurements of beam parameters with 2D matrix camera arrays", Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); https://doi.org/10.1117/12.259917

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