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Saghafi S, Becker K, Gori F, Foroughipour M, Bollwein C, Foroughipour M, Steiger K, Weichert W, Dodt HU. Engineering a better light sheet in an axicon-based system using a flattened Gaussian beam of low order. JOURNAL OF BIOPHOTONICS 2022; 15:e202100342. [PMID: 35104051 DOI: 10.1002/jbio.202100342] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 01/05/2022] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
Lasers are fundamental tools in research and development. The shape of an incident laser beam directly affects the results, when it propagates through complex structured meso-aspheric optical elements. In conic-based systems utilizing elements such as axicons, the impact of secondary lobes is mostly overlooked, although the intensity distributions at the central spot and the side-lobes directly affect the beam properties. We investigate the interaction of two axicons (160° and 170°) with incident beams approximated by Gaussian, high-order Flattened-Gaussian, and low-order Flattened-Gaussian functions. We demonstrate that replacing an incident Gaussian beam with a low-order Flattened-Gaussian beam reduces the secondary lobes and significantly improves the uniformity of the intensity profile. We practically applied this effect in engineering a conic-aspheric-based static light-sheet microscope producing markedly improved results.
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Affiliation(s)
- Saiedeh Saghafi
- Section of Bioelectronics, Institut für Festkörperelektronik (FKE), Vienna, Austria
| | - Klaus Becker
- Section of Bioelectronics, Institut für Festkörperelektronik (FKE), Vienna, Austria
- Section of Bioelectronics, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Franco Gori
- Dipartimento di Ingegneria, Roma Tre University, Rome, Italy
| | - Massih Foroughipour
- Section of Bioelectronics, Institut für Festkörperelektronik (FKE), Vienna, Austria
- Section of Bioelectronics, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | | | - Meraaj Foroughipour
- Section of Bioelectronics, Institut für Festkörperelektronik (FKE), Vienna, Austria
| | - Katja Steiger
- Institute of Pathology, Technical University of Munich, Munich, Germany
| | - Wilko Weichert
- Institute of Pathology, Technical University of Munich, Munich, Germany
| | - Hans-Ulrich Dodt
- Section of Bioelectronics, Institut für Festkörperelektronik (FKE), Vienna, Austria
- Section of Bioelectronics, Center for Brain Research, Medical University of Vienna, Vienna, Austria
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Abstract
Partially coherent sources with non-conventional coherence properties present unusual behaviors during propagation, which have potential application in fields like optical trapping and microscopy. Recently, partially coherent sources exhibiting circular coherence have been introduced and experimentally realized. Among them, the so-called pseudo Schell-model sources present coherence properties that depend only on the difference between the radial coordinates of two points. Here, the intensity and coherence properties of the fields radiated from pseudo Schell-model sources with a degree of coherence of the besinc type are analyzed in detail. A sharpening of the intensity profile is found for the propagated beam by appropriately selecting the coherence parameters. As a possible application, the trapping of different types of dielectric nanoparticles with this kind of beam is described.
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