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Related Experiment Video

Updated: Apr 11, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Discrete-mode ZnO microparticle random laser.

Toshihiro Nakamura, Shohei Sonoda, Taisei Yamamoto

    Optics Letters
    |June 2, 2015
    PubMed
    Summary

    Irregular-shaped zinc oxide (ZnO) microparticles create stable random lasers with few lines and low background emission, unlike conventional ZnO nanoparticle lasers. Intra-particle confinement explains these unique lasing characteristics.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Random lasers offer potential for low-cost coherent light sources.
    • Conventional zinc oxide (ZnO) nanoparticle random lasers often suffer from high background emission and numerous unstable lasing lines.
    • Understanding factors influencing random laser performance is crucial for developing advanced optical devices.

    Purpose of the Study:

    • To investigate the lasing properties of random lasers utilizing irregular-shaped ZnO microparticles.
    • To compare the performance of ZnO microparticle random lasers with conventional ZnO nanoparticle film random lasers.
    • To elucidate the underlying mechanisms responsible for the observed lasing characteristics.

    Main Methods:

    • Fabrication of random lasers using irregular-shaped ZnO microparticles.

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  • Characterization of lasing spectra, intensity stability, and background emission.
  • Analysis of optical modes and their confinement within the microparticles.

    • Main Results:

    • The ZnO microparticle random laser demonstrated a limited number of lasing lines.
    • Stable lasing intensities and negligible background emission were observed.
    • Gain competition between discrete laser modes was identified.
    • Intra-particle confinement of laser cavity modes was confirmed as the primary reason for these properties.

    Conclusions:

    • Irregular-shaped ZnO microparticles enable highly stable and efficient random laser operation.
    • Intra-particle mode confinement is a key factor in achieving superior random laser performance.
    • This approach offers a promising pathway for developing next-generation random laser technologies.