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Proceedings Article

Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica

[+] Author Affiliations
T. Gertus

Altechna R&D (Lithuania)

A. Michailovas

Ctr. for Physical Sciences and Technology (Lithuania)

K. Michailovas, V. Petrauskienė

EKSPLA UAB (Lithuania)

Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431S (March 3, 2015); doi:10.1117/12.2075869
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From Conference Volume 9343

  • Laser Resonators, Microresonators, and Beam Control XVII
  • Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Lutz Aschke; Kunihiko Washio
  • San Francisco, California, United States | February 07, 2015

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. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

T. Gertus ; A. Michailovas ; K. Michailovas and V. Petrauskienė
" Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica ", Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431S (March 3, 2015); doi:10.1117/12.2075869; http://dx.doi.org/10.1117/12.2075869


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