Measurement of the detection quantum efficiency of microchannel plates for medium energy electrons

Introduction The modulation transfer function (MTF) of a slow-scan CCD camera (Gatan modell 679 attached to our Zeiss EM 912 Omega) has been determined with high precision for the standard and the new anti-reflection YAG scintillator. It is shown that deconvolution of experimental patterns allows the reconstruction of image details down to pixel size. From the analysis of deconvoluted noise patterns we found that for this camera the detection quantum efficiency (DQE) is 0.6 in the typical working range of 300 to 3000 electrons per pixel and does not depend on the scintillator. A full discussion of this work can be found in.Experiment To determine the point spread function (PSF) we punched a hole in a sheet film holder which then was partially covered by one or two knife edges (slit). These masks were projected onto the scintillator. About 600 line scans perpendicular to the edge or slit were extracted and averaged to reduce noise (Fig. 1).

Download Full-text

Extreme Ultraviolet Quantum Efficiency Of Opaque Alkali Halide Photocathodes On Microchannel Plates

10.1117/12.943595 ◽

1988 ◽

Cited By ~ 8

Author(s):

O. H. W. Siegmund ◽

E. Everman ◽

J. V. Vallerga ◽

M. Lampton

Keyword(s):

Quantum Efficiency ◽

Alkali Halide ◽

Extreme Ultraviolet ◽

Microchannel Plates

Download Full-text

Relative quantum efficiency measurements of CsI, CsBr, and CsI/CsBr coated microchannel plates

10.1117/12.23262 ◽

1990 ◽

Author(s):

Rachel K. Martin ◽

John H. Chappell ◽

Stephen S. Murray

Keyword(s):

Quantum Efficiency ◽

Microchannel Plates ◽

Relative Quantum

Download Full-text

On the experimental violation of Mermin's inequality with imperfect measurements

Quantum Information and Computation ◽

10.26421/qic11.9-10-7 ◽

2011 ◽

Vol 11 (9&10) ◽

pp. 820-839

Author(s):

Ruffin Evans ◽

Olivier Pfister

Keyword(s):

Quantum Efficiency ◽

Experimental Test ◽

State Of The Art ◽

Photon Number ◽

Type Inequality ◽

Optical Loss ◽

Current State ◽

Detection Quantum Efficiency ◽

Spin Measurements

We investigate theoretically the feasibility of an experimental test of the Bell-type inequality derived by Mermin for correlated spins larger than ${1}/{2}$. Using the Schwinger representation, we link the output fields of two two-mode squeezers in order to create correlated effective spins between two observers. Spin measurements will be performed by photon-number-resolved photodetection, which has recently come of age. We examine the effect of nonideal detection quantum efficiency -and any other optical loss - on the violation margin of Mermin's inequality. We find that experimental violation is well accessible for spins larger than 1, for quantum efficiencies compatible with the current state of the art.

Download Full-text