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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1641–1645

Numerical calculation method of modulation transfer function for preproximity focusing electron-optical system

Ling Ren, Feng Shi, Hui Guo, Honggang Wang, and Benkang Chang  »View Author Affiliations

Applied Optics, Vol. 52, Issue 8, pp. 1641-1645 (2013)

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In order to explore the relation between the modulation transfer function (MTF) and the halo effect for low-light-level (LLL) image intensifiers, the MTF for the preproximity focusing electron-optical system is calculated according to the electron distribution on the microchannel plate input face. During the calculation, the halo effect from secondary scattered electrons is not treated. By tracing the trajectory of photoelectrons emitted from one point on a GaAs photocathode into the preproximity focusing electron-optical system, the electron distribution is calculated, namely the point spread function. The MTF for the preproximity focusing electron-optical system is numerically calculated according to the electron distribution, which is fitted. The results show that the fitting curve of the MTF is in agreement with the analytic expressions. When the spatial frequency is less than 50lp/mm, the relative error is below 5%. This research provides theoretical support for further development of LLL night-vision technology.

© 2013 Optical Society of America

OCIS Codes
(110.2970) Imaging systems : Image detection systems
(110.4100) Imaging systems : Modulation transfer function
(250.0250) Optoelectronics : Optoelectronics

ToC Category:
Imaging Systems

Original Manuscript: November 8, 2012
Revised Manuscript: February 7, 2013
Manuscript Accepted: February 8, 2013
Published: March 6, 2013

Ling Ren, Feng Shi, Hui Guo, Honggang Wang, and Benkang Chang, "Numerical calculation method of modulation transfer function for preproximity focusing electron-optical system," Appl. Opt. 52, 1641-1645 (2013)

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