Stimulated surface- and edge-emission were investigated for ZnO thin films grown epitaxially by pulsed laser deposition. The lasing threshold was 0.32 MW/cm2 for surface pumping and 0.5 MW/cm2 for edge pumping, which is significantly lower than thresholds observed previously. A modified variable stripe length method was used to measure the gain, which was 1369 cm-1 for N-band emission. Losses were measured using the shifting excitation spot method and values of 6.2 cm-1 and 6.3 cm-1 were found for the N-band and P-band, respectively. The measured gain and loss were the highest and lowest (respectively) ever reported for ZnO films.
@article{arxiv.1307.3636,
title = {Stimulated emission from ZnO thin films with high optical gain and low loss},
author = {A-S. Gadallah and K. Nomenyo and C. Couteau and D. J. Rogers and G. Lérondel},
journal= {arXiv preprint arXiv:1307.3636},
year = {2015}
}