Heat pipe oven of well-defined column density

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Abstract
A modification of the concentric heat‐pipe oven is presented which exceeds the conventional heat pipe oven because of a better defined column density and a significantly shorter warm‐up time for achieving stable operation. Similar to the conventional concentric heat‐pipe oven, the modified version provides metal‐vapor–noble gas mixtures with adjustable partial pressures. As an example, third harmonic experiments have been carried out in a strontium–xenon mixture and phase‐matching curves have been measured which demonstrate the well‐defined column density.