Galvo-controlled scanning mirrors offer the best solution for fast imaging acquisition in a laser scanning microscope. The mirrors are housed in a unit that includes a rotating wheel mounting up to four dichroic mirrors and a descanning lens. Both single photon and multiphoton excitation can be utilized with the unit; for single photon excitation, light is brought to the unit by a single-mode fiber optics (3.5 µm diameter) with SMA connector.