Abstract
Mode characteristics are experimentally and numerically investigated for the AlGaInAs/InP microcylinder lasers with radii ranging from 3.25 to 5.5 μm. The measured lasing spectra suggest wavelength crossing between different radial-order modes at , and the threshold current dramatically increases as , which can be well explained by three-dimensional finite-difference time-domain simulation. The simulated mode factors greatly degrade in the microcylinder resonators as and strongly depend on the mode wavelength because of vertical radiation loss, which results in a limitation for low threshold lasing. In addition, the near coincidence of mode wavelengths for different radial modes indicates the possible mode coupling at .
© 2015 Optical Society of America
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