Faculté des sciences

Demonstration of an ultraviolet ZnO-based optically pumped third order distributed feedback laser

Hofstetter, Daniel ; Bonetti, Yargo ; Giorgetta, Fabrizio R. ; El-Shaer, Abdel-Hamid ; Bakin, Andrey ; Waag, Andreas ; Schmidt-Grund, Rüdiger ; Schubert, Mathias ; Grundmann, Marius

In: Applied Physics Letters, 2007, vol. 91, no. 111108, p. 1-3

The authors demonstrate an optically pumped ZnO distributed feedback laser operating at 383 nm. For a large temperature range between 10 and 270 K, the device lased in a single longitudinal mode. Mode selection was accomplished via a third order diffraction grating, which was dry etched into a 120 nm thick Si3N4 layer deposited on the ZnO active region. They observed a... More

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    Summary
    The authors demonstrate an optically pumped ZnO distributed feedback laser operating at 383 nm. For a large temperature range between 10 and 270 K, the device lased in a single longitudinal mode. Mode selection was accomplished via a third order diffraction grating, which was dry etched into a 120 nm thick Si3N4 layer deposited on the ZnO active region. They observed a spectral linewidth of 0.4 nm, a pump threshold intensity of 0.12 MW/cm2, and a peak output power of 14 mW. From wavelength versus temperature measurements, they deduced a temperature tuning coefficient of the ZnO refractive index of 9×10−5 K−1.