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The development of GaN-based vertical-cavity surface-emitting lasers (VCSELs) has been progressing rather fast in the past few years. Owing to the special device structures of GaN-based VCSELs, novel designs have to be incorporated in order to achieve high performance in terms of low threshold, high efficiency, stable mode profile and polarization direction. We demonstrate an easy and cost-effective way to realize index-guiding structure that significantly lowers the threshold and observe the transverse mode spectra of guiding and antiguiding VCSELs. We also realize the GaN-based VCSEL with high-contrast grating (HCG) as the top mirror and achieve polarization control over manipulation of HCG parameters.
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