Abstract

Analytic expressions of the spatial coherence of partially coherent fields propagating in the Fresnel regime in all but the simplest of scenarios are largely lacking, and calculation of the Fresnel transform typically entails tedious numerical integration. Here, we provide a closed-form approximation formula for the case of a generalized source obtained by modulating the field produced by a Gauss–Shell source model with a piecewise constant transmission function, which may be used to model the field’s interaction with objects and apertures. The formula characterizes the coherence function in terms of the coherence of the Gauss–Schell beam propagated in free space and a multiplicative term capturing the interaction with the transmission function. This approximation holds in the regime where the intensity width of the beam is much larger than the coherence width under mild assumptions on the modulating transmission function. The formula derived for generalized sources lays the foundation for the study of the inverse problem of scene reconstruction from coherence measurements.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Fractional vortex Hilbert’s Hotel

Greg Gbur
Optica 3(3) 222-225 (2016)

Imaging of Extended Polychromatic Sources and Generalized Transfer Functions

George B. Parrent
J. Opt. Soc. Am. 51(2) 143-151 (1961)

General theory of linear, coherent optical data-processing systems

H. J. Butterweck
J. Opt. Soc. Am. 67(1) 60-70 (1977)

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 (5)

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

Equations (57)

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