Abstract
One-dimensional photonic crystal band-edge lasing at different excitations was studiedexperimentally by altering the excitation angle. We considered almost every conditionincluding in-band, out-of-band and near the band edge while keeping the density of statesunchanged. Holographic rhodamin 6G-doped dichromated gelatin was used for creatinglow-threshold photonic band-edge lasing (PBEL). Lasing actions excited near thehigh-energy and low-energy band edges were observed simultaneously, and their full widthsat half maximum were different. The results show that the PBEL intensity and pumpefficiency are sensitive to the excitation angle, enhanced obviously at the excitation nearthe band edge and suppressed distinctly in the band which agreed well with thetheoretical prediction. We also demonstrated for the first time that active mattersexist not only in the air voids but also in the high-index regions of the gelatin.
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