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Pockels-effect-based Adiabatic Frequency Conversion in Ultrahigh-Q Microresonators
Abstract: Adiabatic frequency conversion has some key advantages over nonlinear frequency conversion. No threshold and no phase-matching conditions need to be fulfilled. Moreover, it exhibits a conversion efficiency of 100 % down to the single-photon level. Adiabatic frequency conversion schemes in microresonators demonstrated so far suffer either from low quality factors of the employed resonators resulting in short photon lifetimes or small frequency shifts. Here, we present an adiabatic frequency conversion (AFC) scheme by employing the Pockels effect. We use a non-centrosymmetric ultrahigh-Q microresonator made out of lithium niobate. Frequency shifts of more than 5 GHz are achieved by applying just 20 V to a 70-μm-thick resonator. Furthermore, we demonstrate that with the same setup positive and negative frequency chirps can be generated. With this method, by controlling the voltage applied to the crystal, almost arbitrary frequency shifts can be realized. The general advances in on-chip fabrication of lithium-niobate-based devices make it feasible to transfer the current apparatus onto a chip suitable for mass production
Anxious Am I?
Following a lifetime rooted in family, schools, culture, and psychotherapy, provoked by the query of a daughter concerning the presence of anxiety in my life, this memoir pursues the presence of anxiety in life and seeks in some context for the concerns with which the author has lived for three-quarters of a century. In the reflections from these situations and influences, he works his way back to stories of personal origin and growth. He has sauntered through persistent issues with which he has been engaged throughout his life, and he has made a few pronouncements, some of which might even ring true. Within these pages, a little wisdom may even be found. And hopefully, with some love and concern, he has responded to the challenging question, "Do you have anxiety?"
Every Bunny Loves to Play
Written and illustrated by Olympic and World Champion Shannon Szabados. As a new mother Shannon wanted to write a book that was more than just words on paper, something that her daughter could learn from. This is an inspiring children's book about a little bunny who loves to play but is faced with scrutiny from outsiders. With obstacles relatable to real-world situations the little bunny forges on creating a path to success. A fun and easy read with underlying messages of adversity, persistence and encouragement for both children and parents.
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