Lasing characteristic of organic octagonal quasicrystal slabs with single-defect microcavity at low-index contrast.

We experimentally demonstrate and characterize an organic octagonal quasicrystal slab with a single-defect microcavity at low-index contrast. The gain medium is the conjugated-polymer, composed by two PPV derivatives, a BEHP-PPV and a MEH-PPV. By optical pumping, the lasing action is achieved at 607 nm with a FWHM of 1 nm. The threshold of lasing is 9 μJ/cm(2). The intensity of the lasing peak depends linearly on the pump energy above the threshold.