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Linewidth characterization of high-Q hybrid lasers. (A) Spectral linewidth of a single high-Q hybrid laser as a function of the offset pump current from threshold 
20 °C, taken from a representative laser. (Inset) The same dependence in log–log scale. (B) Distribution of the spectral linewidth of high-Q hybrid laser tested spanning three laser bars fabricated on two separate chips, as a function of their emission wavelength.
