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Reshaping a multimode laser beam into a constructed Gaussian beam for generating a thin light sheet
Author(s) -
Saghafi Saiedeh,
HaghiDanaloo Nikoo,
Becker Klaus,
Sabdyusheva Inna,
Foroughipour Massih,
Hahn Christian,
Pende Marko,
Wanis Martina,
Bergmann Michael,
Stift Judith,
Hegedus Balazs,
Dome Balazs,
Dodt HansUlrich
Publication year - 2018
Publication title -
journal of biophotonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 66
eISSN - 1864-0648
pISSN - 1864-063X
DOI - 10.1002/jbio.201700213
Subject(s) - optics , beam parameter product , materials science , beam (structure) , m squared , laser beam quality , multi mode optical fiber , laser , achromatic lens , gaussian beam , superposition principle , laser diode , optoelectronics , optical fiber , physics , laser beams , quantum mechanics
Based on the modal analysis method, we developed a model that describes the output beam of a diode‐pumped solid state (DPSS) laser emitting a multimode beam. Measuring the output beam profile in the near field and at the constructed far field the individual modes, their respective contributions, and their optical parameters are determined. Using this information, the beam is optically reshaped into a quasi‐Gaussian beam by the interference and superposition of the various modes. This process is controlled by a mode modulator unit that includes different meso‐aspheric elements and a soft‐aperture. The converted beam is guided into a second optical unit comprising achromatic‐aspheric elements to produce a thin light sheet for ultramicroscopy. We found that this light sheet is markedly thinner and exhibits less side shoulders compared with a light sheet directly generated from the output of a DPSS multimode laser.