Self-emergent laser cavity-solitons for efficient metrological microcombs
Optical frequency combs have proven to enable accurate time keeping with fractional stabilities below 10−18. In their standard form, they are pulsed laser sources with considerable footprint and large energy demand, aspects that together make these systems usually available only in dedicated laboratories. On the other hand, microcombs, or optical frequency combs in microresonators, are miniaturised systems in which nonlinear phenomena produce an optical comb output due to the strong light confinement of the injected pump light. In those structures and under certain conditions, it is possible to observe cavity solitons dynamics, which have shown to improve the metrological proper- ties of such systems. Solitary states in dissipative systems usually require a particular balance between parametric gain and loss and dispersion and nonlinearity. In common implementations however, it is challenging to obtain large conversion efficiencies between the pump radiation and the available comb at the output.
My findings demonstrate that the laser cavity-soliton approach developed by our group is a competitive microcomb platform obtained nesting a microresonator into an amplifying fibre cavity. It supports robust, efficient, self-starting, stable solitary states. These interesting features are achieved thanks to the delicate interplay between the slow underlying nonlinearities, which act as an intrinsic stabilising loop. The same nonlinearities play an essential role during the start-up phase, pushing the laser into robust, solitary operation. My thesis will be papers-styled with the addition of linking chapters. The first chapter will cover all the relevant literature of the field and the general scope of my work; in the second chapter I will discuss the theoretical framework behind the physics of laser cavity-solitons; I will then follow with paper-style chapters with additional introductory paragraphs and a conclusions chapter.
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Department affiliated with
- Physics and Astronomy Theses
InstitutionUniversity of Sussex
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