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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 20 — Jul. 10, 2011
  • pp: 3461–3469

Quadrant photodetector sensitivity

Lazo M. Manojlović  »View Author Affiliations

Applied Optics, Vol. 50, Issue 20, pp. 3461-3469 (2011)

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A quantitative theoretical analysis of the quadrant photodetector (QPD) sensitivity in position measurement is presented. The Gaussian light spot irradiance distribution on the QPD surface was assumed to meet most of the real-life applications of this sensor. As the result of the mathematical treatment of the problem, we obtained, in a closed form, the sensitivity function versus the ratio of the light spot 1 / e radius and the QPD radius. The obtained result is valid for the full range of the ratios. To check the influence of the finite light spot radius on the interaxis cross talk and linearity, we also performed a mathematical analysis to quantitatively measure these types of errors. An optimal range of the ratio of light spot radius and QPD radius has been found to simultaneously achieve low interaxis cross talk and high linearity of the sensor.

© 2011 Optical Society of America

OCIS Codes
(040.1240) Detectors : Arrays
(040.5160) Detectors : Photodetectors
(280.3420) Remote sensing and sensors : Laser sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: March 3, 2011
Revised Manuscript: April 30, 2011
Manuscript Accepted: May 4, 2011
Published: July 5, 2011

Lazo M. Manojlović, "Quadrant photodetector sensitivity," Appl. Opt. 50, 3461-3469 (2011)

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