Although nanolasers typically have low Q-factors and high lasing thresholds,they have been successfully implemented with various gain media. Intuitively,it seems that an increase in the gain coefficient would improve thecharacteristics of nanolasers. For a plasmonic nanolaser, in particular, adistributed-feed-back (DFB) laser, we propose a self-consistent model thattakes into account both spontaneous emission and the multimode character oflaser generation to show that for a given pumping strength, the gaincoefficient has an optimal value at which the radiation intensity is at amaximum and the radiation linewidth is at a minimum.
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