English: In forwarded-detected CARS, the generated photons together with pump and Stokes lasers go through the samples and detected by a photonmultiplier tube (PMT) after a high optical density (OD) filter removed the pump and Stokes lasers. In epi-CARS, the back scattered newly-generated photons is redirected by a dichroic mirror and after high OD filters are used to remove back scattered pump and Stokes lasers, the newly generated photons are detected by a PMT.
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