Resolution beyond classical limits with spatial frequency heterodyning

A. Mudassar, A. R. Harvey, A. H. Greenaway, J. D C Jones

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A technique for coherent imaging based on spatial frequency heterodyning is described. Three images corresponding to three physical measurements are recorded. For the first measurement, a scene is simply illuminated with a coherent beam and for measurements 2and 3, the scene is projected with cosine and sine fringes, respectively. Due to spatial frequency heterodyning, upper and lower side band information falls in the pass band of the imager. These bands are separated and correct phases and positions are assigned to these bands in the spatial frequency domain. An extension of bandwidth is achieved in the frequency domain and the inverse frequency domain data then give a high resolution coherent image.

Original languageEnglish
Pages (from-to)148-151
Number of pages4
JournalChinese Optics Letters
Issue number3
Publication statusPublished - Mar 2006


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