Advancements in Degenerate Distributed Feedback Lasing
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915456641662976 |
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| author | Herrero-Parareda, Albert Furman, Nathaniel Capolino, Filippo |
| author_facet | Herrero-Parareda, Albert Furman, Nathaniel Capolino, Filippo |
| contents | We advance the concept of degenerate distributed feedback (DDFB) lasing in a double grating photonic structure that operates near a degenerate band edge (DBE) to achieve a robust single-frequency lasing regime. The DBE is an exceptional point of degeneracy (EPD) of fourth order involving four coalescing Bloch eigenmodes. A DDFB photonic cavity operating close to the DBE frequency is shown to display a large quality factor that scales with the fifth power of the cavity length. Upon the inclusion of gain, the DDFB cavity displays a low lasing threshold with the exceptional scaling as the inverse of the fifth power of the double grating length, i.e., $α_{D,th} \propto 1/N^5$, where $N$ is the number of waveguide unit cells making the mirrorless cavity. The work proposed here shows a path to single-frequency lasing mode using a mirrorless cavity with minimal device footprint. The DDFB laser is very attractive for various applications including communications, sensing, and spectroscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15955 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Advancements in Degenerate Distributed Feedback Lasing Herrero-Parareda, Albert Furman, Nathaniel Capolino, Filippo Optics We advance the concept of degenerate distributed feedback (DDFB) lasing in a double grating photonic structure that operates near a degenerate band edge (DBE) to achieve a robust single-frequency lasing regime. The DBE is an exceptional point of degeneracy (EPD) of fourth order involving four coalescing Bloch eigenmodes. A DDFB photonic cavity operating close to the DBE frequency is shown to display a large quality factor that scales with the fifth power of the cavity length. Upon the inclusion of gain, the DDFB cavity displays a low lasing threshold with the exceptional scaling as the inverse of the fifth power of the double grating length, i.e., $α_{D,th} \propto 1/N^5$, where $N$ is the number of waveguide unit cells making the mirrorless cavity. The work proposed here shows a path to single-frequency lasing mode using a mirrorless cavity with minimal device footprint. The DDFB laser is very attractive for various applications including communications, sensing, and spectroscopy. |
| title | Advancements in Degenerate Distributed Feedback Lasing |
| topic | Optics |
| url | https://arxiv.org/abs/2508.15955 |