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CPP: Chemische Physik und Polymerphysik

CPP 11: Photoactive Materials

CPP 11.3: Talk

Thursday, April 5, 2001, 18:25–18:45, 110

Laser emission from dye-doped mesoporous fibers — •Justus Loerke and Frank Marlow — MPI für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim a.d. Ruhr

We have studied mesoporous MCM-41-like fibers doped with Rhodamine 6G (Rh6G). In order to achieve laser emission from the microfibers (diameter: 20µm), which show amplified spontaneous emission along the fiber axis, the end faces of single fibers were coated with reflective gold layers.

When excited with laser light, these fiber resonators show a narrow emission band consisting of several sharp lines with a regular spacing and with a linewidth that is orders of magnitude lower than the width of the fluorescence band of Rh6G in solution. These observations, especially the regular spacing which is dependent on the fiber dimensions, are clear indications for laser operation. The intensity of the laser modes shows a threshold behaviour typical for lasers. The output beam from the fibers is highly collimated and has a high intensity.

This is the first realization of a mesoporous microlaser with controlled output. As the fluorescent molecules are accessible via the pore system, tuning of the laser material is possible.