Figure 6: Optical setup.

M: mirror; L: lens; DM: dichroic mirror; PMT: photomultiplier tube; SD: Si detector; APD: avalanche photodiode; C. W.: continuous-wave.
M: mirror; L: lens; DM: dichroic mirror; PMT: photomultiplier tube; SD: Si detector; APD: avalanche photodiode; C. W.: continuous-wave.