Analogy of harmonic modelocked pulses to trapped Brownian particles improves laser performance

buir.contributor.authorLaçin, Mesut
buir.contributor.authorRepgen, Paul
buir.contributor.authorŞura, Aladin
buir.contributor.authorIlday, Fatih Ömer
dc.citation.epage11en_US
dc.citation.issueNumber46
dc.citation.spage[1]
dc.citation.volumeNumber29
dc.contributor.authorLaçin, Mesut
dc.contributor.authorRepgen, Paul
dc.contributor.authorŞura, Aladin
dc.contributor.authorŞenel, Çağrı
dc.contributor.authorİlday, Fatih Ömer
dc.date.accessioned2024-03-07T06:47:44Z
dc.date.available2024-03-07T06:47:44Z
dc.date.issued2023-02-28
dc.departmentDepartment of Physics
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.departmentDepartment of Electrical and Electronics Engineering
dc.description.abstractHigh-repetition-rate ultrafast lasers are needed for diverse applications. Harmonic modelocking, where multiple identical, equidistant pulses circulate in the cavity, reaches beyond the practical limitations of reducing the cavity length. However, it suffers from stochastic deviations that manifest as supermodes in the radio-frequency spectrum and difficulties in maintaining the same harmonic state, often coupled with trade-offs in pulse energy, duration, or noise performance. Here, we first show that deviations in the temporal positions of the pulses contribute disproportionately more to the supermodes than deviations in their amplitudes. Then, we argue that these fluctuations are analogous to those of trapped Brownian particles. This analogy reveals that supermodes are suppressed by stronger spectral filtering, which corresponds to fluid viscosity, and higher pulse energy reduces the noise, akin to lower temperature. Guided by this intuitive picture, we construct a Yb-fibre laser incorporating strong filtering and high intracavity energies by limiting nonlinear polarisation evolution to a short section of ordinary fibre. The rest of the all-fibre cavity comprises polarisation-maintaining fibre, which additionally improves environmental robustness. We report record-high supermode suppression ratios, reaching 80 dB, excellent long-term and environmental stability, and pulse energy, duration, and noise characteristics that are similar to fundamentally modelocked lasers.
dc.description.provenanceMade available in DSpace on 2024-03-07T06:47:44Z (GMT). No. of bitstreams: 1 Analogy_of_harmonic_modelocked_pulses_to_trapped_Brownian_particles_improves_laser_performance.pdf: 2420256 bytes, checksum: a48fd50223e8746ee2ece05b4948e6da (MD5) Previous issue date: 2023-02-28en
dc.identifier.doi10.1007/s00340-023-07979-z
dc.identifier.eissn1432-0649
dc.identifier.issn0946-2171
dc.identifier.urihttps://hdl.handle.net/11693/114373
dc.language.isoEnglish
dc.publisherSpringerLink
dc.relation.isversionofhttps://dx.doi.org/10.1007/s00340-023-07979-z
dc.source.titleApplied Physics B
dc.titleAnalogy of harmonic modelocked pulses to trapped Brownian particles improves laser performance
dc.typeArticle

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