Hot vapor spectroscopy with integrated photonic waveguides

The spectroscopy of hot atomic vapors, especially of rubidium and cesium, is a hot topic since the early studies of Bunsen and Kirchhoff more than 150 years ago. Today the precision spectroscopy of alkali gases, and some molecular gases, ranges from fundamental research to real world applications. Especially the possibility to integrate light sources, optics, electronics in a miniaturized way has been driving the field forward during the last decade. One way to integrate atomic spectroscopy with versatile optical components are photonic waveguides made of various materials, such as silicon, silicon nitride or KDP, lithographically structured with industry standard processes. This state of the art technology allows for high quality photonic structures such as waveguides, splitters, resonators, interferometers, which can now be combined with the linear and non-linear optical properties of atomic gases. In this talk we will present, how to realize various types of integrated spectroscopy cells with a focus on applications in quantum optics, especially nonlinear effects down to the single photon level.