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Updated: Jun 22, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Versatile opto-fluidic ring resonator lasers with ultra-low threshold.

Scott Lacey, Ian M White, Yuze Sun

    Optics Express
    |June 25, 2009
    PubMed
    Summary

    We developed a versatile opto-fluidic ring resonator dye laser that functions with any liquid refractive index. This microfluidic laser achieves a record low lasing threshold and allows for efficient light coupling.

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    Area of Science:

    • Optics and Photonics
    • Microfluidics
    • Laser Technology

    Background:

    • Microfluidic lasers offer miniaturization and tunability.
    • Previous designs were limited by liquid refractive index (RI) matching requirements.
    • Whispering gallery modes (WGMs) in micro-resonators enable low-threshold lasing.

    Purpose of the Study:

    • To develop a versatile opto-fluidic ring resonator (OFRR) dye laser.
    • To demonstrate OFRR operation independent of the liquid's refractive index.
    • To achieve ultra-low lasing thresholds and efficient light out-coupling.

    Main Methods:

    • Fabrication of a micro-sized glass capillary OFRR.
    • Analysis of WGMs for liquids with varying refractive indices (lower and higher than the capillary wall).

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  • Demonstration of R6G dye laser operation in ethanol, chloroform, and quinoline.

    • Main Results:

    • OFRR supports WGMs with high Q-factors (>10^9) for both low and high core RI.
    • Achieved a lasing threshold of 25 nJ/mm^2, significantly lower than prior microfluidic lasers.
    • Demonstrated efficient laser emission out-coupling using an integrated optical waveguide.

    Conclusions:

    • The developed OFRR dye laser is a versatile platform, independent of liquid RI.
    • The device offers ultra-low lasing thresholds and efficient light delivery.
    • This technology has potential for various applications in sensing and photonics.