Axicon focusing in oblique illumination

Anna Thaning; Zbigniew Jaroszewicz; Ari T. Friberg

doi:10.1117/12.524141

19 November 2003 Axicon focusing in oblique illumination

Anna Thaning, Zbigniew Jaroszewicz, Ari T. Friberg

Proceedings Volume 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life; (2003) https://doi.org/10.1117/12.524141
Event: 19th Congress of the International Commission for Optics: Optics for the Quality of Life, 2002, Florence, Italy

Abstract

In perpendicular illumination, axicons give a focal line of large depth of focus and narrow, well-known transverse width. In oblique illumination, however, the focal line is broadened and its shape changed. In this contribution, we use the method of stationary phase to characterize the focal segments for oblique illumination in a compact form, which both yields the width of the focus and reveals it to be asteroid-shaped. These results are compared to those for a diffractive axicon of elliptically shaped phase-step pattern, which are found to be slightly squeezed asteroids. It is shown that the changes in the focus are caused by off-axis astigmatism for oblique illumination, and by on-axis astigmatism for the elliptic axicon.

Citation Download Citation

Anna Thaning, Zbigniew Jaroszewicz, and Ari T. Friberg "Axicon focusing in oblique illumination", Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); https://doi.org/10.1117/12.524141

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