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  • 1.
    Geskus, Dimitri
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Centro de Lasers e Aplicacoes, IPEN/SP.
    Jakutis-Neto, Jonas
    Instituto de Estudos Avancados, IEAv-DCTA.
    Spence, D. J.
    MQ Photonics, Department of Physics and Astronomy, Macquarie University.
    Pask, H. M.
    MQ Photonics, Department of Physics and Astronomy, Macquarie University.
    Wetter, N. U.
    Centro de Lasers e Aplicacoes, IPEN/SP.
    Extreme Linewidth Broadening in a Nd:YLiF4-KGW Intracavity Raman Laser2015Conference paper (Refereed)
    Abstract [en]

    Linewidth broadening of up to 4 nm of the fundamentaleld has been observed in a intracavity Nd:YLF-KGW Ramanlaser. Nine laser congurations have been analyzedto identify the responsible processes using a mathematicalmodel.

  • 2.
    Ismail, Nur
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Calil Kores, Cristine
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
    Geskus, Dimitri
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Pollnau, Markus
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    The Fabry-Pérot resonator: Spectral line shapes, generic and related Airy distributions, linewidths, finesses, and performance at low or frequency-dependent reflectivity2016In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 24, no 15, 16366-16389 p.Article in journal (Refereed)
    Abstract [en]

    We systematically characterize the Fabry-Pérot resonator. We derive the generic Airy distribution of a Fabry-Pérot resonator, which equals the internal resonance enhancement factor, and show that all related Airy distributions are obtained by simple scaling factors. We analyze the textbook approaches to the Fabry-Pérot resonator and point out various misconceptions. We verify that the sum of the mode profiles of all longitudinal modes is the fundamental physical function that characterizes the Fabry-Pérot resonator and generates the Airy distribution. Consequently, the resonator losses are quantified by the linewidths of the underlying Lorentzian lines and not by the measured Airy linewidth. Therefore, we introduce the Lorentzian finesse which provides the spectral resolution of the Lorentzian lines, whereas the usually considered Airy finesse only quantifies the performance of the Fabry-Pérot resonator as a scanning spectrometer. We also point out that the concepts of linewidth and finesse of the Airy distribution of a Fabry-Pérot resonator break down at low reflectivity. Furthermore, we show that a Fabry-Pérot resonator has no cut-off resonance wavelength. Finally, we investigate the influence of frequency-dependent mirror reflectivities, allowing for the direct calculation of its deformed mode profiles.

  • 3. Kores, C. C.
    et al.
    Geskus, Dimitri
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Pask, H. M.
    Wetter, N. U.
    Diode side pumped, quasi-CW Nd:YVO4 self-Raman laser operating at 1176 nm2015In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 2015, 934718-1-934718-6 p.Conference paper (Refereed)
    Abstract [en]

    In this work we demonstrate for the first time, to the best of our knowledge, quasi-continuous wave (qcw) laser operation of a diode-side-pumped Nd:YVO<inf>4</inf> self-Raman laser operating at 1176 nm. The double beam mode controlling (DBMC) technique used in this work allows fundamental mode laser oscillation, resulting in a beam quality M2 of 2.42 and 2.18 in the horizontal and vertical directions, respectively. More than 3.5 W of peak output power at 1176 nm was achieved with TEM<inf>00</inf> laser mode, corresponding to an optical conversion efficiency of 5.4%. With multimode operation, more than 8W of peak output power was achieved, corresponding to 11.7% optical conversion efficiency.

  • 4. Kores, Cristine Calil
    et al.
    Jakutis-Neto, Jonas
    Geskus, Dimitri
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Pask, Helen M.
    Wetter, Niklaus U.
    Diode-side-pumped continuous wave Nd3+: YVO4 self-Raman laser at 1176 nm2015In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 40, no 15, 3524-3527 p.Article in journal (Refereed)
    Abstract [en]

    Here we report, to the best of our knowledge, the first diode-side-pumped continuous wave (cw) Nd+3: YVO4 self-Raman laser operating at 1176 nm. The compact cavity design is based on the total internal reflection of the laser beam at the pumped side of the Nd+3: YVO4 crystal. Configurations with a single bounce and a double bounce of the laser beam at the pumped faced have been characterized, providing a quasi-cw peak output power of more than 8 W (multimode) with an optical conversion efficiency of 11.5% and 3.7 W (TEM00) having an optical conversion efficiency of 5.4%, respectively. Cw output power of 1.8 W has been demonstrated.

  • 5.
    Reijn, Saara-Maarit
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Inst Pesquisas Energet & Nucl, Ctr Lasers & Aplicacoes, BR-05508000 Sao Paulo, Brazil.
    Pinheiro, Felipe A.
    Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil.;Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England.;Univ Southampton, Ctr Photon Metamat, Southampton SO17 1BJ, Hants, England..
    Geskus, Dimitri
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Inst Pesquisas Energet & Nucl, Ctr Lasers & Aplicacoes, BR-05508000 Sao Paulo, Brazil.
    Wetter, Niklaus U.
    Inst Pesquisas Energet & Nucl, Ctr Lasers & Aplicacoes, BR-05508000 Sao Paulo, Brazil..
    Enabling focusing around the corner in multiple scattering media2015In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 54, no 25, 7740-7746 p.Article in journal (Refereed)
    Abstract [en]

    We report an alternative experimental setup to laterally focus light at an angle of 90 deg relative to turbid, multiple scattering media, using preprocessing wavefront shaping. We compare the measured image quality to one obtained in the usual configuration for focusing light through turbid media, where focusing occurs behind the scattering sample. We demonstrate that the depth of focus in the lateral configuration is of the same order of the usual transversal one because both setups are designed to operate in the deep Fresnel zone. This result shows that this novel, versatile lateral configuration allows for effectively focusing around corners through multiple scattering samples.

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