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Proceedings Paper

Planar InGaAs APD (avalanche photodiode) for eyesafe laser rangefinding applications
Author(s): Paul P. Webb
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Paper Abstract

Planar InGaAs/InP avalanche photodiodes (APD's) for use in eye-safe laser rangefinding applications in the 1100 to 1700 nm spectral range are discussed. The devices have diameters of 85 and 200 micrometers , having capacitances of 0.7 and 2 pF, respectively. For the diodes operating at a responsivity of 10 A/W at 1540 nm, for which the gain is approximately 10, measured noise currents at room temperature are 0.5 and 0.75 pA/(root)Hz, respectively, and frequency response is greater than 400 MHz. Results are also reported for a back-entry version of the 200 micrometers diameter APD fitted with a 600 micrometers diameter high index ball lens for enlarging the effective sensitive diameter. Quantum efficiency for the unit is found to be about 65%, and good response uniformity is achieved over a diameter greater than 500 micrometers , using an f/1.8 optical system.

Paper Details

Date Published: 1 April 1991
PDF: 7 pages
Proc. SPIE 1419, Eyesafe Lasers: Components, Systems, and Applications, (1 April 1991); doi: 10.1117/12.43842
Show Author Affiliations
Paul P. Webb, General Electric Canada Inc. (Canada)

Published in SPIE Proceedings Vol. 1419:
Eyesafe Lasers: Components, Systems, and Applications
Anthony M. Johnson, Editor(s)

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