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  {\bf \Large \textsf {Photocorrelation spectroscopy}}\\[-2cm]
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Photocorrelation spectroscopy can help determining very narrow spectral
lines found in some stellar objects. In a simulation, we are able to determine
the line width of a 20\,MHz wide spectral line on a thermal blackbody
background, an distinguish laser-like emission from pseudo-thermal light. This
may help to identify optical stellar lasers in the visible range~[2].
\begin{figurehere}
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    \includegraphics[width=0.42\columnwidth]{completesetup4}\hspace{2cm}
    \includegraphics[width=0.42\columnwidth]{g2_arclaser_6}
  % \end{center}
  \figcaption{Left: preparation of a Doppler-widened laser line on top of a thermal
    background. Right: resultant photopair correlation, revealing a long tail
   in $\mathsf{g^{(2)}(\tau)}$ corresponding to a narrow spectral line on top
   of a thermal photon bunching signature.}
\end{figurehere}