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<p>As the perfect vortex beam (PVB) is garnering attention for its potential application in the field of optical communication, considerable attention has been focused towards increasing its data-handling capacity through multiplexing. Wavelength multiplexing has been a prospect for increasing the data-handling capacity of optical communication channels. PVBs generated from polychromatic light would have near-infinite degrees of freedom in the wavelength domain, thus increasing data-handling capacity of the vortex beam. The present study demonstrates the generation of PVB rings from a polychromatic (or white light) source. The white-light PVB (WPVB) has been generated using a setup based on the Fourier transformation of the Bessel–Gaussian beam generated using an axicon lens. Coloured PVBs were also generated from WPVBs using colour filters with different spectra, wherein the intensity profiles were well preserved. The experimental results are well supported by a theoretical formulation based on the amalgamation of PVBs of multiple wavelengths. The WPVBs would provide another dimension for near-infinite degrees of freedom, apart from the customary OAM-based multiplexing in PVBs.</p>

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Polychromatic perfect vortex beam

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Swati Gangwar,
  • Rajeev Dwivedi,
  • V. K. Jaiswal,
  • Ranjana Mehrotra,
  • Shibu Saha,
  • Parag Sharma

摘要

As the perfect vortex beam (PVB) is garnering attention for its potential application in the field of optical communication, considerable attention has been focused towards increasing its data-handling capacity through multiplexing. Wavelength multiplexing has been a prospect for increasing the data-handling capacity of optical communication channels. PVBs generated from polychromatic light would have near-infinite degrees of freedom in the wavelength domain, thus increasing data-handling capacity of the vortex beam. The present study demonstrates the generation of PVB rings from a polychromatic (or white light) source. The white-light PVB (WPVB) has been generated using a setup based on the Fourier transformation of the Bessel–Gaussian beam generated using an axicon lens. Coloured PVBs were also generated from WPVBs using colour filters with different spectra, wherein the intensity profiles were well preserved. The experimental results are well supported by a theoretical formulation based on the amalgamation of PVBs of multiple wavelengths. The WPVBs would provide another dimension for near-infinite degrees of freedom, apart from the customary OAM-based multiplexing in PVBs.