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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Cholesteric liquid crystals exhibit photonic bandgaps (PhBGs) crucial for optical applications.
    • Alignment imperfections in liquid crystal cells can significantly alter optical properties.

    Purpose of the Study:

    • To experimentally investigate the impact of alignment imperfections on optically pumped light emissions in dye-doped cholesteric cells.
    • To analyze the characteristics of allowed and forbidden emission lines within the PhBG.

    Main Methods:

    • Fabrication of dye-doped cholesteric cells with varying cell gaps and substrate types (glance and frosted glass).
    • Optical pumping experiments to study light emission spectra.
    • Analysis of emission spectra to identify broadening and additional lines.

    Main Results:

    • Alignment imperfections lead to broadening of allowed lasing lines at PhBG edges.
    • An additional, forbidden emission line appears inside the PhBG due to imperfections.
    • Forbidden and allowed lines exhibit distinct stability differences under continuous pumping.

    Conclusions:

    • Alignment imperfections in cholesteric cells introduce unique spectral features, including forbidden emission lines.
    • The stability difference between allowed and forbidden lines provides a method for distinguishing their origins.
    • Understanding these effects is vital for optimizing cholesteric liquid crystal devices.