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  • 1.
    Grivas, Christos
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ismaeel, Rand
    Corbari, Costantino
    Huang, Chung-Che
    Hewak, Dan W.
    Lagoudakis, Pavlos
    Brambilla, Gilberto
    Generation of Multi-Gigahertz Trains of Phase-Coherent Femtosecond Laser Pulses in Ti:Sapphire Waveguides2018In: Laser & Photonics reviews, ISSN 1863-8880, E-ISSN 1863-8899, Vol. 12, no 11, article id 1800167Article in journal (Refereed)
    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.

  • 2.
    Vazquez-Cordova, Sergio A.
    et al.
    Univ Twente, MESA Inst Nanotechnol, Opt Sci Grp, POB 217, NL-7500 AE Enschede, Netherlands..
    Aravazhi, Shanmugam
    Univ Twente, MESA Inst Nanotechnol, Integrated Opt Microsyst Grp, POB 217, NL-7500 AE Enschede, Netherlands..
    Grivas, Christos
    KTH, School of Engineering Sciences (SCI), Applied Physics. Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England.
    Yong, Yean-Sheng
    Univ Twente, MESA Inst Nanotechnol, Opt Sci Grp, POB 217, NL-7500 AE Enschede, Netherlands..
    Garcia-Blanco, Sonia M.
    Univ Twente, MESA Inst Nanotechnol, Opt Sci Grp, POB 217, NL-7500 AE Enschede, Netherlands..
    Herek, Jennifer L.
    Univ Twente, MESA Inst Nanotechnol, Opt Sci Grp, POB 217, NL-7500 AE Enschede, Netherlands..
    Pollnau, Markus
    Univ Twente, MESA Inst Nanotechnol, Integrated Opt Microsyst Grp, POB 217, NL-7500 AE Enschede, Netherlands.;Univ Surrey, Dept Elect & Elect Engn, Adv Technol Inst, Guildford GU2 7XH, Surrey, England..
    High optical gain in erbium-doped potassium double tungstate channel waveguide amplifiers2018In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 5, p. 6260-6266Article in journal (Refereed)
    Abstract [en]

    We report on the optical-gain properties of channel waveguides patterned into lattice-matched KGdxLuyEr1-x-y(WO4)(2) layers grown onto undoped KY(WO4)(2) substrates by liquid phase epitaxy. A systematic investigation of gain is performed for five different Er3+ concentrations in the range of 0.75 to 10at.% and different pump powers and signal wavelengths. In pump-probe-beam experiments, relative internal gain, i.e., signal enhancement minus absorption loss of light propagating in the channel waveguide, is experimentally demonstrated, with a maximum value of 12 +/- 5 dB/cm for signals at the peak-emission wavelength of 1534.7 nm.

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