external cavity configuration also allows intracavity frequency doubl ing, which
are currently attracting much interest for green light emitters of laser display
applications [116]. These high-power applications are also challenging for future
optoelectronics. Another interesting application is the spontaneous emission in
microcavities. Microcavity VCSELs with QDs would be one of the good candi-
dates for single-photon emitters [117].
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