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.

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We report on self-injection-locked near infrared laser technology using whisper-gallery-mode resonators. The laser linewidth is suppressed by 104 and has an instantaneous linewidth in the sub-10 Hertz range. The laser is used for generating stable reference light for atomic clocks.