A microscope having a light source that emits light pulses for illumination of a specimen, the light pulses containing photons having a photon energy, is disclosed. The microscope is characterized in that a detector, which has an energy band gap between a quiescent state and an active state that is greater than the photon energy, is provided for determination of a time-defined pulse width of the light pulses. Also described are a detector for determination of a time-defined pulse width of light pulses for illumination of a microscopic specimen, and a method for microscopy.