Laser arrangement and method for startup

A laser arrangement for generating laser light, comprising

• a laser resonator for initial oscillation of two laser modes between a first and a second resonator mirror which are spaced apart from one another by a resonator length, wherein the second resonator mirror is configured and provided for coupling the two laser modes out of the laser resonator, and wherein the second resonator mirror has a first frequency-dependent attenuation profile for laser light,
• a laser medium which is arranged between the resonator mirrors,
• a measuring device which is configured and provided for measuring at least one parameter of the two out-coupled laser modes and/or at least one ambient condition of the laser arrangement,
• a control device which is configured and provided for adjusting the resonator length and the first attenuation profile on the basis of the at least one parameter and/or the at least one ambient condition,
• wherein the laser medium has a second frequency-dependent attenuation profile, and the control device is configured and provided to change the first and the second attenuation profile, in particular to adjust them to one another.