Book of Abstracts (Plenary Talks)

Plenary Talk 1: Semiconductor-core optical fibers {Wednesday, June 6th, 2018, 09:30-10:30}

Professor Ursula J. Gibson

Optical fibers are primarily used for communications and as active media for fiber lasers.
I will talk about a new paradigm – where optical and electronic properties are brought together by replacing the glass core with a semiconductor.  These fibers can be fabricated in bulk quantities, and the large surface to volume ratio of the fiber makes possible the realization of unusual materials processing.
Recent advances have made the semiconductor-core fibers competitive with silicon-on-insulator wafers as a platform for non-linear optics and optoelectronic devices.  They have been used in demonstrations  of solar cells, optical detectors and switches.  This talk will present some highlights of this exciting area and some of the possible future applications of these materials.

 

Plenary Talk 4: Space: the less explored dimension of light {Thursday, June 7th, 2018, 09:30-10:30}

Professor Siddharth Ramachandran

When we think of a beam of light, we generally think of a spot; or a beam that travels in a straight line with a Gaussian shape. On the other hand, higher-order eigenstates of light manifest in an infinite-dimensional set of spatially complex beam patterns possessing phase- and/or polarisation-singularities. Such beams have long been known to possess several intriguing characteristics such as enhanced propagation stability, phase fronts that evolve helically rather than in a straight line (hence beams that carry orbital-angular-momentum), and the ability to self-heal past obstructions, to name a few. These unique characteristics make them attractive for applications as diverse as super-resolution microscopy, deep-tissue imaging, DNA sorting, classical and quantum communications, remote sensing and directed-energy defence strategies.

These favourable attributes notwithstanding, higher order modes of light have been traditionally perceived to be inherently unstable in guided media such as optical fibers. Recent work has upended this perception, and today, suitably designed optical fibers can transmit such exotic states of light over lengths as long as 10 km. Since fibers are well known for their ability to offer nonlinear and dispersive tailoring, the systematic and controllable study of nonlinear interactions of higher order modes is now feasible. This talk will discuss recent results and applications enabled by fiber propagation of beams that have long been considered interesting and useful, but hitherto unstable in nature.

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Plenary Talk 5: Applications of Laser Spectroscopy to Meet Some Challenges in Medicine {Thursday, June 7th, 2018, 13:00-14:00}

Professor Katarina Svanberg

Laser spectroscopy has been shown to be a valuable tool both in the detection and the therapy of human malignancies. The most important prognostic factor for cancer patients is early tumor discovery. If malignant tumors are detected during the non-invasive stage, most tumors show a high cure rate of more than 90%. Even though there are many conventional diagnostic modalities, very early tumors may be difficult to discover. Laser-induced fluorescence (LIF) for tissue characterization is a technique that can be used for monitoring the biomolecular changes in tissue under transformation from normal to dysplastic and cancer tissue before structural tissue changes are seen at a later stage. The technique is based on UV or near-UV illumination for fluorescence excitation. The fluorescence from endogenous chromophores in the tissue alone, or enhanced by exogenously administered tumor seeking substances can be utilized. The technique is non-invasive and gives the results in real-time. LIF can be applied for point monitoring or in an imaging mode for larger areas, such as the vocal cords or the portio of the cervical area.

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Plenary Talk 6: Laser Spectroscopy in Action {Thursday, June 7th, 2018, 16:00-17:00}

Professor Sune Svanberg

The presentation with focus on laser spectroscopy applied to the ecological, agricultural and environmental areas with activities at LU and SCNU, but with start with an historical review of the author´s experience in the general field of laser spectroscopy. Glimpses from atomic laser spectroscopy, high-power laser-matter interaction, and biophotonics will be given from a 45 year endeavor in these areas.

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Plenary Talk 7: From extreme nonlinear optics to ultrafast atomic physics {Friday, June 8th, 2018, 10:00-11:00}

Professor Anne L’Huillier

The interaction of atoms with intense laser radiation leads to the generation of high-order harmonics of the laser field. In the time domain, this corresponds to a train of pulses in the extreme ultraviolet range and with attosecond duration. I will introduce the physics of high-order harmonic generation and attosecond pulses and discuss briefly the development of attosecond sources today.

The attosecond time scale is that of the electron motion in  atoms and molecules. The photon energy of the attosecond pulses is generally above the ionization threhold, thus probing the first valence shells. Attosecond light pulses are used to study, for example, the dynamics of atomic or molecular photoionization. I will introduce the method developed for measuring this dynamics and present measurements of ultrashort temporal delays in photoionization.