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We demonstrated a miniaturized 871 nm semiconductor laser optically injection locked to a whisper-gallery-mode resonator demonstrating Hertz-level instanta-neous linewidth for Yb+ clock applications. The laser linewidth and short term drift are suppressed by over 104.

We present an ultra-narrow-linewidth laser designed based on optical self-injection locking to a miniaturized whispering gallery mode resonator. The measured instantaneous linewidth of the laser is at sub-Hertz-level, making it suitable for precise energy-level excitation in quantum technology applications.

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