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A long existing issue for microdisk lasers is the small spontaneous emissioncoupling rate ({\beta}) in microdisk,. We found that it is due to the couplingof emitter spontaneous emission into competing Fabry-Perot (FP) modes in themicrodisk cavity. Based on this analysis, we propose a new type of photoniccrystal microdisk (PCM) laser to drastically suppress the photonic density ofstates in the vertical FP modes. As a result, we obtained a three fold increaseof {\beta} than previously reported highest {\beta} of 0.15 at roomtemperature. The spontaneous emission control in truncated photonic crystalsbecomes efficient when the period number is more than one. We also demonstratea three-stack PCM laser at low temperature with {\beta} as high as 0.72, whichis 24 times higher than that in typical single microdisk (0.03), which alsoresults in 50% threshold reduction.

Photonic crystal microdisk lasers with exceptional spontaneous emission coupling to the lasing mode