Einladung zum Promotionsvortrag von Herrn Marco Cassataro:
„ Mid-infrared nonlinear optics in hollow-core photonic-crystal fiber “
Hollow-core photonic-crystal fibers (HC-PCFs) have been proven to constitute ideal platforms for ultrafast nonlinear optics, owing to their broad-band transmission window, high damage threshold and tunable dispersion and nonlinearity. Ultrashort pulses can then interact with gases over long distances, enabling new regimes such as in-fiber ionization.
In this talk I will present how the aforementioned advantages can be employed for nonlinear photonics in the mid-infrared – a spectral region with many applications –, also through the use of recently-designed structures such as single-ring HC-PCF. By employing such fibers, generation of ultra-broad supercontinua extending from the deep-ultraviolet to the mid-infrared is demonstrated. The supercontinua have an energy content of several microjoules, and their generation is obtained even when the central wavelength of the input pulses is changed, without any other modification of the system.
Through the analysis of the effects of ionization on the system properties I will present a new analytical model for dispersive wave emission, showing the possibility of dispersive wave emission in the mid-infrared from near-infrared pump pulses, overcoming the long-standing requirement of the presence of a zero-dispersion wavelength in order for this nonlinear process to take place. Finally, I will discuss the possibility of using single-ring HC-PCF for the compression of mid-infrared pulses. As the in-fiber dynamics is maintained even when tuning the wavelength of the input pulses, these fibers can be used as versatile systems for the delivery of ultrashort pulses. (Vortrag auf Englisch)
Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.