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Multimode Robust Lasing in a Dye-Doped Polymer Layer Embedded in a Wedge-Shaped Cholesteric.

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  • 1Department of Physics, Yerevan State University, 1 Alex Manukyan Str., Yerevan 0025, Armenia.

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Summary

This study explores laser generation in cholesteric liquid crystals (CLCs) with induced defects. Researchers found unique, robust spectral behavior of defect modes, enabling tunable coherent light sources.

Keywords:
chiralitycholesteric liquid crystalsdefect modesgeometric phaselaser dyelasingphotonic band gappolymer layer

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Cholesteric liquid crystals (CLCs) are key for tunable coherent light sources.
  • Induced defects in CLCs offer unique optical properties.
  • Controlling defect modes' spectral properties is crucial for device applications.

Purpose of the Study:

  • Investigate laser generation possibilities in dye-doped polymer layers within wedge-shaped CLCs.
  • Analyze the spectral control and behavior of induced defect modes.
  • Explore the potential for compact, low-threshold, and tunable coherent light sources.

Main Methods:

  • Utilized a dye-doped polymer layer embedded in a wedge-shaped CLC.
  • Employed simulations based on the Berreman 4x4 matrix approach.
  • Investigated a wide range of CLC thicknesses.

Main Results:

  • Demonstrated multimode laser generation due to multiple defect modes within the photonic bandgap (PBG).
  • Observed both periodic and continuous generation of defect modes along specific spectral lines.
  • Identified a unique and robust spectral behavior of induced defect modes.

Conclusions:

  • Multimode laser generation is achievable in CLCs with induced defects.
  • The observed spectral behavior of defect modes is unique and promising for advanced photonic devices.
  • This research expands the application range of CLC-based coherent light sources.