Actions for Quantum efficiency characterization of back-illuminated CCDs Part2 [electronic resource] : reflectivity measurements

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Quantum efficiency characterization of back-illuminated CCDs Part2 [electronic resource] : reflectivity measurements

Published
Washington, D.C. : United States. Dept. of Energy. High Energy Physics Division, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
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United States. Department of Energy. High Energy Physics Division and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The usual quantum efficiency (QE) measurement heavily relies on a calibrated photodiode (PD) and the knowledge of the CCDs gain. Either can introduce significant systematic errors. But reflectivity can also be used to verify QE measurements. 1 - R > QE, where R is the reflectivity, and over a significant wavelength range, 1 - R = QE. An unconventional reflectometer has been developed to make this measurement. R is measured in two steps, using light from the lateral monochromator port via an optical fiber. The beam intensity is measured directly with aPD, then both the PD and CCD are moved so that the optical path length is unchanged and the light reflects once from the CCD; the PD current ratio gives R. Unlike traditional schemes this approach makes only one reflection from the CCD surface. Since the reflectivity of the LBNL CCDs might be as low as 2 percent this increases the signal to noise ratio dramatically. The goal is a 1 percent accuracy. We obtain good agreement between 1 - R and the direct QE results.
Report Numbers
E 1.99:lbnl--59378
lbnl--59378
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Note
Published through SciTech Connect.
01/19/2006.
"lbnl--59378"
": KA1503020"
Electronic Imaging 2006, San Jose, CA, 15 - 19January 2006.
Bebek, Chris J.; Groom, Donald E.; Karcher, Armin; Roe, Natalie A.; Fabricius, Maximilian H.
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Funding Information
DE-AC02-05CH11231
PS1521
View MARC record | catkey: 14674219