Abstract

The question of the maximum size of aperture that can be usefully employed to photograph an object through atmospheric turbulence constitutes one of the classic questions of atmospheric optics. The answer to this question lies in the determination of the spatial-correlation function of the electric field at the aperture of the camera. Although measurements of the correlation function of the irradiance furnish some relevant information, a satisfactory answer cannot be given by such measurements alone because they describe only the statistics of the amplitude of the radiation but not of the phase. This paper describes a new interferometer with which the spatial correlation of the electric field can be measured directly. The result of the measurement is in the form of an interferogram that displays the degree of coherence of the light over the aperture of the camera in terms of the visibility of a nominal fringe pattern. The interferometer requires no high-quality optical components. The results of a set of preliminary experiments to measure the spatial coherence of laser light after propagation through the atmosphere over horizontal paths are described.

© 1970 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Correlation Measurements on Partially Coherent Beams by Means of an Integration Technique

M. Bertolotti, L. Muzii, and D. Sette
J. Opt. Soc. Am. 60(12) 1603-1607 (1970)

Interferometric Study of Phase Fluctuations of a Laser Beam Through the Turbulent Atmosphere

M. Bertolotti, M. Carnevale, L. Muzii, and D. Sette
Appl. Opt. 7(11) 2246-2251 (1968)

Time-Resolved Measurements of the Phase Fluctuations of a Coherent Beam at the Emergence from a Turbulent Layer

P. Burlamacchi, A. Consortini, and L. Ronchi
Appl. Opt. 6(7) 1273-1275 (1967)

References

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
Login to access OSA Member Subscription

Cited By

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
Login to access OSA Member Subscription

Figures (4)

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
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables 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
Login to access OSA Member Subscription

Equations (9)

You do not have subscription access to this journal. Equations 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
Login to access OSA Member Subscription