Beyond the regular band edges: lasing near a degenerate band edge

Albert Herrero Parareda; Nathaniel Furman; Filippo Capolino

doi:10.1117/12.3005345

13 March 2024 Beyond the regular band edges: lasing near a degenerate band edge

Albert Herrero Parareda, Nathaniel Furman, Filippo Capolino

Proceedings Volume PC12864, Solid State Lasers XXXIII: Technology and Devices; PC1286406 (2024) https://doi.org/10.1117/12.3005345
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We develop the concept of degenerate distributed feedback (DDFB) laser operating close to Exceptional Points of Degeneracy (EPDs) of fourth-order, known as a Degenerate Band Edge (DBE), where four different Bloch eigenmodes coalesce. A waveguide operating near a DBE displays a large group delay that leads to a strong light-matter interaction enhancement upon the inclusion of a gain medium. This enhancement results in an ultralow lasing threshold that scales anomalously with cavity length. The resulting DDFB laser is expected to enforce mode selectivity and a coherent single-frequency operation that is resistant to small perturbations, load variations and distributed losses.

Conference Presentation

Citation Download Citation

Albert Herrero Parareda, Nathaniel Furman, and Filippo Capolino "Beyond the regular band edges: lasing near a degenerate band edge", Proc. SPIE PC12864, Solid State Lasers XXXIII: Technology and Devices, PC1286406 (13 March 2024); https://doi.org/10.1117/12.3005345

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