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Extended ultrahigh-Q-cavity diode laser.

Zhenda Xie, Wei Liang, Anatoliy A Savchenkov

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    |June 2, 2015
    PubMed
    Summary

    We developed a 698 nm extended cavity semiconductor laser using a whispering gallery mode resonator. This laser achieves narrow linewidth and tunable single-mode operation, ideal for compact strontium atomic clocks.

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    Area of Science:

    • Optics and Photonics
    • Atomic Physics
    • Laser Technology

    Background:

    • Precision atomic clocks require highly stable and narrow-linewidth light sources.
    • Semiconductor lasers offer compact and potentially low-cost solutions for atomic spectroscopy.

    Purpose of the Study:

    • To develop a compact, tunable, single-mode semiconductor laser for atomic clock applications.
    • To investigate the use of whispering gallery mode resonators for laser stabilization.

    Main Methods:

    • Constructed an extended cavity semiconductor laser incorporating a whispering gallery mode resonator for optical feedback.
    • Utilized a diffraction grating for wavelength selection and a reflective semiconductor amplifier.
    • Characterized laser performance including linewidth and tuning range.

    Main Results:

    • Achieved single longitudinal mode lasing at 698 nm.
    • Demonstrated a sub-kilohertz laser linewidth.
    • Obtained a coarse tuning range of 9 nm.
    • The resonator exhibited ultrahigh-Q factor (>10^10) supporting stimulated Rayleigh scattering.

    Conclusions:

    • The developed laser system is suitable for integration with the 1S0-3P0 strontium transition.
    • This laser technology offers a pathway to compact and precise atomic clocks.
    • Whispering gallery mode resonators are effective for stabilizing semiconductor lasers.