Abstract

A method of autofocusing a Gaussian beam with obscuration onto a small target, down range and on the beam axis, is presented. For a source with a sinusoidally time varying focus (dither) the temporal spectra of the reflected signal can be very accurately calculated for ranges where Fresnel approximations are valid. For such ranges certain spectral components in the reflected signal undergo significant phase and amplitude changes while passing through true focus. The closed loop control strategy naturally evolves from these properties.

© 1976 Optical Society of America

Boresighting a Gaussian beam on a specular target point: a method using conical scan

Ahmed Erteza
Appl. Opt. 15(3) 656-660 (1976)

Propagation of laser beams having an on-axis null in the presence of thermal blooming*

J. E. Pearson, C. Yeh, and W. P. Brown
J. Opt. Soc. Am. 66(12) 1384-1388 (1976)

Short-term average irradiance profile of an optical beam in a turbulent medium

M. T. Tavis and H. T. Yura
Appl. Opt. 15(11) 2922-2931 (1976)

Parametric Study of Apertured Focused Gaussian Beams

D. A. Holmes, J. E. Korka, and P. V. Avizonis
Appl. Opt. 11(3) 565-574 (1972)

High power laser propagation

Frederick G. Gebhardt
Appl. Opt. 15(6) 1479-1493 (1976)