Seminar on FBG by Prof. J. Albert

Recent advances in cladding mode
sensing with optical fiber gratings

Prof. Jacques Albert – Carleton University, CANADA
Friday 23 March 2018 10:00 AM

Sala SITI, Corso Castelfidardo, 30/A – 10138 Torino

Tilted fiber Bragg gratings provide three interesting advantages in sensing:
1) access to surface waves on the cladding surface;
2) a resonant structure with high Q-factor spectral linewidths;
3) a built-in very accurate thermometer.
These features have been critical in the development of high performance sensors
for physical, chemical, and biochemical signals as well as process monitors for
nanoscale coatings of metals and dielectric materials for plasmonic applications.

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Upcoming Seminar

Passive phase-locking and coherent combining of lasers

Prof. Amiel Ishaaya

Ben Gurion University

The possibility of combining several lasers into one high brightness powerful laser beam is appealing to many practical applications. Various beam-combining approaches have been investigated which can be divided into three main categories: incoherent, active coherent, and passive coherent combining approaches.
This talk will focus on passive interferometric laser beam combining using compact, plane parallel, intracavity combiners.
The basic configurations along with our results in both solid-state and fiber laser configurations will be presented, and various aspects and the possible up-scalability of this approach will be discussed.

15 March 2018 at 3:00 PM

Sala SITI Castelfidardo, 30/A

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Towards the use of bioresorbable fibers in time-domain diffuse optics

Di Sieno, L., Boetti, N. G., Dalla Mora, A., Pugliese, D., Farina, A., Konugolu Venkata Sekar, S., Ceci-Ginistrelli, E., Janner, D., Pifferi, A. and Milanese, D. (2018), J. Biophotonics, 11: n/a, e201600275. doi:10.1002/jbio.201600275

In this joint paper, in collaboration with the biophotonics group from Politecnico di Milano led by A. Pifferi, we demonstrate the viability of our bioresorbable phosphate fiber for time-domain diffuse optics. In the article, we show the fabrication of bioresorbable optical fibers designed for diffuse optics applications, featuring large core diameter (up to 200 μm) and numerical aperture (0.17) to maximize the collection efficiency of diffused light. Furthermore, we show an ex-vivo validation on a chicken breast by measuring the absorption and scattering spectra in the 500-1100 nm range using interstitially inserted bioresorbable fibers.

This work represents a step toward a new way to look inside the body using optical fibers that can be implanted in patients. These fibers could be useful either for diagnostic (e. g. for monitoring the evolution after surgical interventions) or treatment (e. g. photodynamic therapy) purposes.

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