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September 5, 2025PhotonicsOpen Access

Narrow-Linewidth Semiconductor Laser with Hybrid Feedback

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This laser achieves significant linewidth reduction and improved coherence through self-injection locking and fixed external cavity feedback.

A single longitudinal mode laser output was achieved with a Lorentzian linewidth of 149Hz, demonstrating significant precision.
The system employs a combination of fixed external cavity feedback and self-injection locking to enhance laser performance.
This approach allows for effective laser mode selection and significant linewidth compression necessary for high-precision applications.
Applications include coherent optical communication and high-precision coherent detection, underscoring its practical importance.

Xue et al. (2025) studied this question.

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This laser achieves significant linewidth reduction and improved coherence through self-injection locking and fixed external cavity feedback.