| Semiconductor microlasers have been extensively studied because of their potential applications to chemical and biological sensing and an optical source for optoelectronic circuits and fiber optic communication. For real applications, microlasers should generate directional emission and high output power. Recently, various experiments have been focused on a deformed microcavity because a circular-shaped microcavity generates an isotropic emission and low output power.In this work, we investigate the emission characteristics of a deformed microcavity of a spiral shape at the room temperature by applying the continuous-wave current. Whispering gallery modes(WGM) emit around the notch with two directions in the far-field pattern. From the spectral measurement with a lensed fiber, we can classify the WGMs into different groups from the mode spacing and show that the two directions are caused by the different mode groups. |
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