We demonstrate multiwavelength lasing of resonant modes in linear (L3) microcavities in a triangular-lattice 2D photonic crystal (PC) slab. The broad spontaneous emission spectrum from coupled quantum dots, modified by the PC microcavity, is studied as a function of the intensity of incident optical excitation. We observe lasing with an ultralow-threshold power of approx600 nW and an output efficiency of approximately 3percent at threshold. Two other resonant modes exhibit weaker turnon characteristics and thresholds of approx2.5 and 200 (mu)W, respectively.
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