Abstract: The present invention relates to an endoscope (2) having first conduction means configured to transmit electromagnetic waves between an illumination device (40) for illuminating an observation area (41) and a distal end (5) of the endoscope (2), and second conduction means configured to transmit electromagnetic waves between a therapy device (42) for treating a therapy area (43) within the observation area (41) and the distal end (5) of the endoscope (82). The endoscope is characterized by a third conduction means configured to transmit electromagnetic waves between an optical coherence tomography device (37) by means of which depth information about said area can be obtained during treatment of the therapy area (43) and the distal end (5) of the endoscope (2).

Abstract: A method for operating a pulsed laser system includes the steps of pumping a laser resonator of the pulsed laser system by means of a pump source in order to generate operating laser pulses at an operating energy level; and coupling the operating laser pulses with a focusing element into an optical fiber. A step of cleaning the optical fiber by means of cleaning laser pulses is performed prior to generating the operating laser pulses. The laser resonator of the pulsed laser system is pumped by means of the pump source in order to generate the cleaning laser pulses at one or more cleaning energy levels between a laser threshold and the operating energy level.