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We present a detailed study of the use of Fabry-Perot (FP) cavities for thespectroscopy of single InAs quantum dots (QDs). We derive optimal cavitycharacteristics and resolution limits, and measure photoluminescence linewidthsas low as 0.9 GHz. By embedding the QDs in a planar cavity, we obtain asufficiently large signal to actively feed back on the length of the FP to lockto the emission of a single QD with a stability below 2% of the QD linewidth.An integration time of approximately two seconds is found to yield an optimumcompromise between shot noise and cavity length fluctuations.

Active feedback of a Fabry-Perot cavity to the emission of a single InAs/GaAs quantum dot