Brillouin lasers in Bragg grating microresonators
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910986356654080 |
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| author | Russell, Ryan L. Merklein, Moritz Lai, Choon Kong Bui, Cong Tinh Casas-Bedoya, Alvaro Choi, Duk-Yong Madden, Stephen J. Eggleton, Benjamin J. |
| author_facet | Russell, Ryan L. Merklein, Moritz Lai, Choon Kong Bui, Cong Tinh Casas-Bedoya, Alvaro Choi, Duk-Yong Madden, Stephen J. Eggleton, Benjamin J. |
| contents | Chip-scale coherent light sources are required in applications spanning metrology and sensing to telecommunications. Brillouin lasers (BLs) offer a route to ultra-coherent optical sources in compact microresonators with free spectral range (FSR) matched to the Brillouin frequency shift (BFS). However, BFS - FSR matching typically facilitates cascaded Brillouin scattering, constraining achievable BL output power and coherence. Here, we demonstrate inhibition of cascading in a planar-integrated chalcogenide microresonator by exploiting the photonic bandgap (PBG) associated with a post-fabrication inscribed, reconfigurable intracavity Bragg grating. The PBG inhibits energy transfer within the target Brillouin scattering pathway, such as from pump to first-order Stokes wave. As a quantitative measure of Brillouin scattering inhibition, we report at least six-fold increase in threshold for onset of BL oscillation, which is ultimately limited by thermorefraction. For on-chip pump power of 399 mW, sufficient for a tenth-order Brillouin cascade, complete inhibition was achieved. Our work positions Bragg grating microresonators as an enabling platform for high performance on-chip BL sources, with reconfigurable modes of operation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_03575 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Brillouin lasers in Bragg grating microresonators Russell, Ryan L. Merklein, Moritz Lai, Choon Kong Bui, Cong Tinh Casas-Bedoya, Alvaro Choi, Duk-Yong Madden, Stephen J. Eggleton, Benjamin J. Optics Chip-scale coherent light sources are required in applications spanning metrology and sensing to telecommunications. Brillouin lasers (BLs) offer a route to ultra-coherent optical sources in compact microresonators with free spectral range (FSR) matched to the Brillouin frequency shift (BFS). However, BFS - FSR matching typically facilitates cascaded Brillouin scattering, constraining achievable BL output power and coherence. Here, we demonstrate inhibition of cascading in a planar-integrated chalcogenide microresonator by exploiting the photonic bandgap (PBG) associated with a post-fabrication inscribed, reconfigurable intracavity Bragg grating. The PBG inhibits energy transfer within the target Brillouin scattering pathway, such as from pump to first-order Stokes wave. As a quantitative measure of Brillouin scattering inhibition, we report at least six-fold increase in threshold for onset of BL oscillation, which is ultimately limited by thermorefraction. For on-chip pump power of 399 mW, sufficient for a tenth-order Brillouin cascade, complete inhibition was achieved. Our work positions Bragg grating microresonators as an enabling platform for high performance on-chip BL sources, with reconfigurable modes of operation. |
| title | Brillouin lasers in Bragg grating microresonators |
| topic | Optics |
| url | https://arxiv.org/abs/2506.03575 |