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Appl Opt. 2001 Nov 10;40(32):5911-20.

Scale-tunable optical correlation with natural light.

Abstract

We describe two different scale-tunable optical correlators working under totally incoherent light. They behave as spatially incoherent wavelength-independent imaging systems with an achromatic point-spread function (PSF). In both cases it is possible to adapt the scale of the achromatic PSF, i.e., to modify the scaling factor of the PSF and preserve the chromatic compensation, by one's shifting the input along the optical axis. The remarkable properties of these systems allow us to carry out a scale-tunable color pattern-recognition experiment with natural light.

PMID:
18364885
DOI:
10.1364/ao.40.005911

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