GaSb-based vertical-cavity surface-emitting lasers with an emission wavelength at 3 μm.

GaSb-based electrically pumped vertical-cavity surface-emitting lasers (VCSELs) with a buried tunnel junction emitting at 3 μm are demonstrated. To achieve this, a low optical loss VCSEL concept with an undoped epitaxial distributed Bragg reflector and intracavity contact is presented. The devices operate up to 5°C continuous wave and up to 50°C in pulsed mode.

On-Chip Generation, Routing, and Detection of Resonance Fluorescence.

Quantum optical circuits can be used to generate, manipulate, and exploit nonclassical states of light to push semiconductor based photonic information technologies to the quantum limit. Here, we report the on-chip generation of quantum light from individual, resonantly excited self-assembled InGaAs quantum dots, efficient routing over length scales ≥1 mm via GaAs ridge waveguides, and in situ detection using evanescently coupled integrated NbN superconducting single photon detectors fabricated on the same chip. By temporally filtering the time-resolved luminescence signal stemming from single quantum dots we use the quantum optical circuit to perform time-resolved excitation spectroscopy on single dots and demonstrate resonance fluorescence with a line-width of 10 ± 1 μeV; key elements needed for the use of single photons in prototypical quantum photonic circuits.

[Kaspar Schwenckfeldt--a Silesian physician, Renaissance student of nature, and bibliophile].

Kaspar Schwenckfeldt (1563-1609) is numbered among the intellectual celebrities of the Age of Renaissance in Silesia. He was the first to describe the flora of this region. His work Stirpium et fossilium Silesiae catalogus, based on his own research, was the fundamental source of knowledge about those plants for almost two centuries.

[Enzymes catalyzing the reduction of aldopentoses and the oxidation of pentitols in Mycobacteria].

M. phlei, grown on synthetic Sauton medium (with 6% glycerol as carbon source), had NADPH- and NADH-aldopentose reductase, as well as NAD-pentitol dehydrogenase activities; some of their properties are studied. These activities are not present in BCG grown on the same medium.