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Proceedings Paper

Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica
Author(s): Titas Gertus; Andrejus Michailovas; K. Michailovas; V. Petrauskienė
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Paper Abstract

In this work we present a beam shaping technique based on a spatially variable phase retardation plate inscribed inside bulk of fused silica glass by femtosecond laser pulses. Formation of self-assembled periodic nanostructures was exploited to fabricate the converter. During the fabrication process we control induced nanogratings orientation and retardance. Combination of a spatially variable waveplate and a polarizer acts as a spatially variable transmission filter. With a converter fabricated to transform an initially Gaussian beam to a flat-top beam we preserve more than 50% of initial laser power. Theoretically, the efficiency of the proposed converter could be up to 70%. The proposed converter with no absorbing elements possesses resistance to optical damage similar to that of fused silica. Additionally, the already-fabricated converter allows for on-the-fly adjustment of the beam shape from flat-top to a shape with a dip in the middle. The shaped beam was tested in a high power picosecond pulse amplifier.

Paper Details

Date Published: 3 March 2015
PDF: 11 pages
Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431S (3 March 2015); doi: 10.1117/12.2075869
Show Author Affiliations
Titas Gertus, Altechna R&D (Lithuania)
Andrejus Michailovas, EKSPLA UAB (Lithuania)
Ctr. for Physical Sciences and Technology (Lithuania)
K. Michailovas, EKSPLA UAB (Lithuania)
V. Petrauskienė, EKSPLA UAB (Lithuania)


Published in SPIE Proceedings Vol. 9343:
Laser Resonators, Microresonators, and Beam Control XVII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Lutz Aschke; Kunihiko Washio, Editor(s)

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