Cavity-free efficient coupling between emitters and guided modes is of great<br>current interest for nonlinear quantum optics as well as efficient and scalable<br>quantum information processing. In this work, we extend these activities to the<br>coupling of organic dye molecules to a highly confined mode of a nanofiber,<br>allowing mirrorless and low-threshold laser action in an effective mode volume<br>of less than 100 femtoliters. We model this laser system based on<br>semi-classical rate equations and present an analytic compact form of the laser<br>output intensity. Despite the lack of a cavity structure, we achieve a coupling<br>efficiency of the spontaneous emission to the waveguide mode of 0.07(0.01), in<br>agreement with our calculations. In a further experiment, we also demonstrate<br>the use of a plasmonic nanoparticle as a dispersive output coupler. Our laser<br>architecture is promising for a number of applications in optofluidics and<br>provides a fundamental model system for studying nonresonant feedback<br>stimulated emission.
Spectroscopic detection and state preparation of a single praseodymium ion in a crystal
Tobias Utikal,
Emanuel Eichhammer,
L. Petersen,
Alois Renn,
Stephan Götzinger,
Vahid Sandoghdar
The narrow optical transitions and long spin coherence times of rare earth ions in crystals make them desirable for a number of applications ranging from solid-state spectroscopy and laser physics to quantum information processing. However, investigations of these features have not been possible at the single-ion level. Here we show that the combination of cryogenic high-resolution laser spectroscopy with optical microscopy allows one to spectrally select individual praseodymium ions in yttrium orthosilicate. Furthermore, this spectral selectivity makes it possible to resolve neighbouring ions with a spatial precision of the order of 10 nm. In addition to elaborating on the essential experimental steps for achieving this long-sought goal, we demonstrate state preparation and read out of the three ground-state hyperfine levels, which are known to have lifetimes of the order of hundred seconds.
Max-Planck-Zentren und -Schulen
Datenerfassung
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