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Mode-selective lasing in high-Q polymer micro bottle resonators.

Qijing Lu, Xiang Wu, Liying Liu

    Optics Express
    |September 15, 2015
    PubMed
    Summary

    Polymer micro bottle resonators demonstrate high-quality whispering gallery and bottle modes, enabling low-threshold lasing. Mode-selective lasing is achieved through fiber coupling, with distinct free spectral ranges for different modes.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Micro bottle resonators (MBRs) are crucial for integrated photonics.
    • Whispering gallery modes (WGMs) and unique bottle modes offer potential for advanced optical devices.

    Purpose of the Study:

    • To fabricate and characterize passive and active polymer MBRs.
    • To investigate lasing properties and mode selectivity in MBRs.
    • To analyze the relationship between equatorial and bottle modes.

    Main Methods:

    • Fabrication of passive and active polymer micro bottle resonators.
    • Identification and characterization of equatorial whispering gallery modes and bottle modes using optical spectroscopy.
    • Realization of lasing in active MBRs.
    • Coupling of tapered fiber to MBRs for mode-selective excitation.

    Main Results:

    • Highest loaded quality (Q) factor exceeding 10^5 achieved for MBRs.
    • Lasing realized in active MBRs with a low threshold of 1 nJ/pulse.
    • Mode-selective lasing demonstrated by coupling to specific WGMs or bottle modes.
    • Bottle mode free spectral range (FSR) found to be approximately one-fifth of the equatorial mode FSR.

    Conclusions:

    • Polymer MBRs are viable platforms for high-Q optical resonators and low-threshold lasers.
    • Mode selectivity can be precisely controlled via external fiber coupling.
    • The distinct FSRs of equatorial and bottle modes offer opportunities for multi-wavelength applications.