Ultraviolet quantum detection efficiency of potassium bromide as an opaque photocathode applied to microchannel plates

Siegmund, Oswald H. W.; Everman, E.; Vallerga, J. V.; Sokolowski, J.S.; Lampton, M.

doi:10.1364/ao.26.003607

Cited by 52 publications

(13 citation statements)

References 23 publications

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“…The wavelength and angular dependence of MCP quantum detection efficiencies have been studied both experimentally [23][24][25] and theoretically. [26][27][28] For MCPs similar to those used in our imaging system, both angular and wave-length dependences of the QDEs are given by Siegmund et al 23 The wavelength dependence from Fig.…”

Section: Intensity Calibrationmentioning

confidence: 99%

Nanograting-based compact vacuum ultraviolet spectrometer and beam profiler for in situ characterization of high-order harmonic generation light sources

Kornilov

Wilcox

Geßner

2010

Review of Scientific Instruments

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A compact, versatile device for vacuum ultraviolet (VUV) beam characterization is presented. It combines the functionalities of a VUV spectrometer and a VUV beam profiler in one unit and is entirely supported by a standard DN200 CF flange. The spectrometer employs a silicon nitride transmission nanograting in combination with a microchannel plate-based imaging detector. This enables the simultaneous recording of wavelengths ranging from 10 to 80 nm with a resolution of 0.25-0.13 nm. Spatial beam profiles with diameters up to 10 mm are imaged with 0.1 mm resolution. The setup is equipped with an in-vacuum translation stage that allows for in situ switching between the spectrometer and beam profiler modes and for moving the setup out of the beam. The simple, robust design of the device is well suited for nonintrusive routine characterization of emerging laboratory- and accelerator-based VUV light sources. Operation of the device is demonstrated by characterizing the output of a femtosecond high-order harmonic generation light source.

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Section: Intensity Calibrationmentioning

confidence: 99%

Nanograting-based compact vacuum ultraviolet spectrometer and beam profiler for in situ characterization of high-order harmonic generation light sources

Kornilov

Wilcox

Geßner

2010

Review of Scientific Instruments

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“…where the reflectance of the mirrors, R, is 0.8; the quantum efficiency of the detector, Q, is 0.1 (Siegmund et al, 1987); the filter transmittance, T, is 0.5; the area of the primary mirror, A, is 316 cm 2 ; the solid angle, Ω, is 8×10 -4 steradians; and the constant 10 6 /4π converts the results to Rayleighs. The resulting sensitivity at 135.6 nm is 500 counts per second per Rayleigh.…”

Section: Sensitivitymentioning

confidence: 99%

<title>Experiment for studying spatial and temporal behavior of the ionosphere</title>

Dymond¹,

McCoy²,

Wood

et al. 2002

Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV

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We present the concept for an instrument designed to map and monitor the ionosphere from geostationary orbit. This instrument will be used to study the spatial and temporal behavior of mesoscale (> 10 km) ionospheric structures. The instrument is designed to primarily operate at night as irregularities are generally more prevalent during the evening. The instrument will be sensitive enough to gather a high signal-to-noise image viewing the nadir in approximately 100 seconds. The instrument can also be operated as a limb imager. The instrument will image a 1.6° degree field-of-view with 10 km spatial resolution. The experiment will use a two-axis gimbal to point to various points on the limb and disk of the Earth. The instrument consists of an extreme ultraviolet (EUV) imager and a far-ultraviolet (FUV) imager. The EUV imager will operate at 83.4 nm using a low resolution imaging spectrograph to set the passband. The O II 83.4 nm emission is produced by photoionization of O during the daytime. Above the limb, this emission can be used to determine altitude distribution of the O + density. The FUV imager will operate at 130.4 , 135.6, and 143.0 nm. At night, The O I 130.4 and O I 135.6 nm emissions are produced by primarily by radiative recombination, and therefore these emissions provide useful ionospheric diagnostics at night. During the daytime, the 130.4 and 135.6 nm lines are primarily produced by photoelectron impact excitation of O; however the 130.4 nm line is also excited by resonant scattering of sunlight. The O I 130.4 and 135.6 nm lines provide information on the O density during the daytime. The instrument will map the daytime N 2 column density using the Lyman-Birge-Hopfield bands near 143.0 nm.

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“…The values of parameter L s were taken from Refs. [12][13][14][15][16] . The experimentally measured (Section 3.1) QE variation data is also presented in Figs 5, 6.…”

Section: Qe Calculationsmentioning

confidence: 99%

<title>Optical constants of as-deposited and treated alkali halides and their VUV quantum efficiency</title>

et al. 1999

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The optical constants of thin films of CsI, KI, and KBr in the spectral range of 53.6-174.4 nm were obtained from the measurements of reflectivity as a function of the incidence angle. The effect of film heating to 420 K and exposure to UV radiation on the optical constants of the three materials was also investigated. The quantum efficiencies (QEs) of the planar photocathodes made with the three alkali halides, as well as the changes in these QEs after the photocathode treatment similar to that applied to the thin films was measured. KBr was found to be the most stable to heating and irradiation. KI appeared to be close to temperature-stable, while UV exposure affected its optical constants. CsI optical constants were changed after 420-K heating, as well as after UV exposure. The changes in the optical constants were related to the QE changes and the correlation between these variations was determined.

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Ultraviolet quantum detection efficiency of potassium bromide as an opaque photocathode applied to microchannel plates

Cited by 52 publications

References 23 publications

Nanograting-based compact vacuum ultraviolet spectrometer and beam profiler for in situ characterization of high-order harmonic generation light sources

Nanograting-based compact vacuum ultraviolet spectrometer and beam profiler for in situ characterization of high-order harmonic generation light sources

<title>Experiment for studying spatial and temporal behavior of the ionosphere</title>

<title>Optical constants of as-deposited and treated alkali halides and their VUV quantum efficiency</title>

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