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Hybrid external cavity laser shows improved linewidth of 25 Hz compared to DFB-LD devices, indicating enhanced performance.
We present a hybrid LiNbO 3 -based integrated tunable external cavity laser (ECL) featuring a multi-period-delayed feedback photonics circuit. Compared to the MHz-level linewidth of a DFB-LD, the ECL achieves a significantly narrowed linewidth of 25 Hz.
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Zhang et al. (2025) studied this question.
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