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Single-mode unidirectional microcavity laser.

Zhen-Nan Tian, Feng Yu, Yan-Hao Yu

    Optics Letters
    |April 15, 2017
    PubMed
    Summary
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    Researchers created a novel Rhodamine B-doped resin microdisk laser using femtosecond laser writing. This pierced microcavity exhibits highly directional, single-mode lasing with a high Q factor, demonstrating a simple method for enhancing microcavity performance.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Whispering gallery mode (WGM) microcavities are crucial for photonics applications.
    • Improving emission directionality and maintaining high quality (Q) factors in microdisk lasers remains a challenge.

    Purpose of the Study:

    • To develop a suspended whispering gallery mode microdisk with enhanced directional emission.
    • To investigate the impact of a pierced hole on microcavity performance.
    • To demonstrate a facile method for improving microcavity characteristics.

    Main Methods:

    • Fabrication of Rhodamine B-doped resin microdisks using femtosecond laser direct writing.
    • Introduction of a pierced hole through the microdisk surface.
    • Characterization of lasing properties, including emission directionality and Q factor.

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  • Numerical simulation using the finite-difference time-domain (FDTD) method.

    • Main Results:

    • Achieved highly directional, single-mode lasing with a far-field divergence angle of approximately 10 degrees.
    • Observed a high Q factor exceeding 2.6×10^3.
    • Numerical simulations confirmed the experimental results and elucidated the effect of the pierced hole.

    Conclusions:

    • The pierced microcavity design effectively enhances emission directionality while maintaining high Q factors.
    • Femtosecond laser direct writing provides a versatile method for fabricating modified microcavities.
    • This approach offers a simple and significant strategy for improving existing microcavity performance.