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Distributed feedback micro-laser array: helixed liquid crystals embedded in holographically sculptured polymeric

Valentin Barna, Roberto Caputo, Antonio De Luca

    Optics Express
    |June 12, 2009
    PubMed
    Summary

    Researchers developed novel organic microcavity lasers with high quality factor (Q) and low volume (V). These miniaturized lasers offer an ultralow lasing threshold and controlled emission properties.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Photonics

    Background:

    • Development of micro-scale lasers is crucial for advanced optical systems.
    • Organic materials offer unique properties for laser fabrication.
    • Distributed feedback (DFB) resonators are key for laser performance.

    Purpose of the Study:

    • To characterize a novel array of organic DFB microcavity lasers.
    • To investigate the performance of liquid crystal-based microcavities.
    • To achieve miniaturized lasers with high quality factor (Q) and low volume (V).

    Main Methods:

    • Fabrication of microchannels using holographic patterning.
    • Confining self-organized mesophases doped with fluorescent guest molecules.
    • Physical characterization of the resulting microcavity laser array.

    Main Results:

    • Achieved a high Q/V ratio in the organic microcavity lasers.
    • Demonstrated mirror-less cavity lasers utilizing liquid crystal microchannels.
    • Observed an ultralow lasing threshold of 25 nJ/pulse.

    Conclusions:

    • The developed micro-laser array exhibits excellent miniaturization.
    • The lasers provide directional control over emission, wavelength tunability, and intensity control.
    • This work presents a promising platform for advanced optoelectronic devices.