OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 29, Iss. 31 — Nov. 1, 1990
  • pp: 4677–4685

Extreme ultraviolet quantum detection efficiency of rubidium bromide opaque photocathodes

Oswald H. W. Siegmund and Geoffrey A. Gaines  »View Author Affiliations


Applied Optics, Vol. 29, Issue 31, pp. 4677-4685 (1990)
http://dx.doi.org/10.1364/AO.29.004677


View Full Text Article

Enhanced HTML    Acrobat PDF (1266 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

We present measurements of the quantum detection efficiency (QDE) of rubidium bromide opaque photocathodes over the 44–1560-Å wavelength range. We achieved QDEs of >60% at λ = 68 Å, and >40% at λ ≈ 920 Å, for RbBr photocathode layers applied to the surface of microchannel plates (MCPs). The photoelectric threshold is observed at λ ≈ 1560 Å, and there is a broad (≈100-Å) QDE minimum centered at λ ≈ 775 Å which correlates with 2× the band gap energy for RbBr. The QDE is characterized by four peaks centered at λ ≈ 68 Å, λ ≈ 400 Å, λ ≈ 600 Å, and ≈1050 Å. The QDE peaks at λ ≈ 400 Å, ≈600 Å, and ≈1050 Å correspond with emission of 3, 2, and 1 photoelectrons, respectively. The QDE at the λ ≈ 68-Å peak is associated with a d-f resonant absorption feature of RbBr. QDE contributions of the photocathode material inside the channels, and on the interchannel web, have been determined. Measurements of the angular variation of the QDE from 0° to 35° to the channel axis are also presented. We describe a simple QDE model and show that its predictions are in accord with the QDE measurements. Preliminary assessment of the stability of RbBr indicates that no QDE degradation occurs after limited exposure (20 h) to air at low humidity (<30%). Examination of the photocathode structure with an electron microscope reveals a rough surface with a scale of the order of 0.5 μm.

© 1990 Optical Society of America

History
Original Manuscript: December 15, 1989
Published: November 1, 1990

Citation
Oswald H. W. Siegmund and Geoffrey A. Gaines, "Extreme ultraviolet quantum detection efficiency of rubidium bromide opaque photocathodes," Appl. Opt. 29, 4677-4685 (1990)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-29-31-4677

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited