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Generation of Multi-Gigahertz Trains of Phase-Coherent Femtosecond Laser Pulses in Ti:Sapphire Waveguides
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2018 (English)In: Laser & Photonics reviews, ISSN 1863-8880, E-ISSN 1863-8899, Vol. 12, no 11, article id 1800167Article in journal (Refereed) Published
Abstract [en]

Miniature lasers producing ultrashort phase-coherent pulses at high repetition rates by stable mode-locking in ambient conditions can offer unique capabilities in various applications, spanning from microwave photonics to telecom and biological imaging techniques. Here, the operation of graphene mode-locked lasers based on channel waveguides written by femtosecond and picosecond laser pulses in Ti:sapphire crystals is demonstrated. Trains of pulses of 41.4 fs duration at a 21.25 GHz repetition rate are generated by capitalizing on the formation of solitons in their monolithic resonators through Gires-Tournois interferometers. The latter, allow for effective pulse shaping via tuning of the intracavity group delay dispersion while simultaneously enabling ultralow laser operating thresholds. A number of features of these sources, including their high-brightness and broad bandwidth, are essential ingredients for achieving high longitudinal resolution and sensitivity, which are the primary performance metrics of the Fourier domain/spectral domain variant of optical coherence tomography systems. A further doubling of the laser repetition rate to 42.5GHz is achieved by coherent pulse interleaving in optical fiber technology, thereby underlining the potential of the Ti:sapphire waveguide lasers to produce highly stable, wide-spaced combs of phase-coherent optical frequency lines.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 12, no 11, article id 1800167
Keywords [en]
channeled waveguides, frequency combs, optical coherence tomography, soliton mode-locking, ultrafast lasers
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-248113DOI: 10.1002/lpor.201800167ISI: 000461797700006Scopus ID: 2-s2.0-85053533129OAI: oai:DiVA.org:kth-248113DiVA, id: diva2:1307358
Note

QC 20190426

Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved

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Grivas, Christos

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