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A mode-locked random laser generating transform-limited optical pulses
Centre for Telecommunication Studies, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, 22451-900, RJ, Brazil.
Centre for Telecommunication Studies, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, 22451-900, RJ, Brazil.
Department of Physics, University of Ottawa, Ottawa, K1N 6N5, Ontario, Canada.
Departamento de Física, Universidade Federal de Pernambuco, Recife, 50670-901, PE, Brazil.
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2024 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 177Article in journal (Refereed) Published
Abstract [en]

Ever since the mid-1960’s, locking the phases of modes enabled the generation of laser pulses of duration limited only by the uncertainty principle, opening the field of ultrafast science. In contrast to conventional lasers, mode spacing in random lasers is ill-defined because optical feedback comes from scattering centres at random positions, making it hard to use mode locking in transform limited pulse generation. Here the generation of sub-nanosecond transform-limited pulses from a mode-locked random fibre laser is reported. Rayleigh backscattering from decimetre-long sections of telecom fibre serves as laser feedback, providing narrow spectral selectivity to the Fourier limit. The laser is adjustable in pulse duration (0.34–20 ns), repetition rate (0.714–1.22 MHz) and can be temperature tuned. The high spectral-efficiency pulses are applied in distributed temperature sensing with 9.0 cm and 3.3 × 10−3 K resolution, exemplifying how the results can drive advances in the fields of spectroscopy, telecommunications, and sensing.

Place, publisher, year, edition, pages
Springer Nature , 2024. Vol. 15, no 1, article id 177
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-342177DOI: 10.1038/s41467-023-44315-7ISI: 001136362600001PubMedID: 38172090Scopus ID: 2-s2.0-85181258466OAI: oai:DiVA.org:kth-342177DiVA, id: diva2:1827967
Note

QC 20240115

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-04-08Bibliographically approved

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Margulis, Walter

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