Laser device, being configured for generating laser pulses by Kerr lens based mode locking, comprising - a laser resonator with a plurality of resonator mirrors (11.1, 11.2, 11.3) spanning a resonator beam path, - a solid state gain medium being arranged in the laser resonator, - a Kerr medium device being arranged with a distance from the gain medium in the laser resonator, wherein the Kerr medium device includes at least one Kerr medium being arranged in a focal range of the resonator beam path and being configured for forming the laser pulses by a combination of self-focusing caused by the nonlinear Kerr effect in conjunction with a soft- or hard-aperture inside the laser resonator, and - a loss-modulation device (31, 32) having a modulator medium (31A, 32A), which is configured for modulating a power loss of the laser pulses generated in the laser resonator, wherein - the Kerr medium device includes the modulator medium (31A, 32A) of the loss-modulation device (31, 32) as the at least one Kerr medium, characterized in that - the modulator medium (31A, 32A) of the loss-modulation device is adapted for a nonlinear phase shift in a range between 100 mrad and 10 rad per pass through the loss modulator medium (31A, 32A) of the loss modulation device (31, 32), and - the laser resonator is configured such that a beam diameter of the circulating laser field in the modulator medium (31A, 32A) of the loss-modulation device is less than the beam diameter in the gain medium, so that the nonlinearity inside the resonator is dominated by the modulator medium (31A, 32A) of the loss-modulation device, wherein the nonlinear phase shift ΔΦ inside the modulator medium (31A, 32A) per pass through the modulator medium is at least ΔΦ total /3, with ΔΦ total being a total nonlinear phase shift within the laser resonator. - a laser resonator with a plurality of resonator mirrors (11.1, 11.2, 11.3) spanning a resonator beam path, - a solid state gain medium being arranged in the laser resonator, - a Kerr medium device being arranged with a distance from the gain medium in the laser resonator, wherein the Kerr medium device includes at least one Kerr medium being arranged in a focal range of the resonator beam path and being configured for forming the laser pulses by a combination of self-focusing caused by the nonlinear Kerr effect in conjunction with a soft- or hard-aperture inside the laser resonator, and - a loss-modulation device (31, 32) having a modulator medium (31A, 32A), which is configured for modulating a power loss of the laser pulses generated in the laser resonator, wherein - the Kerr medium device includes the modulator medium (31A, 32A) of the loss-modulation device (31, 32) as the at least one Kerr medium, - the modulator medium (31A, 32A) of the loss-modulation device is adapted for a nonlinear phase shift in a range between 100 mrad and 10 rad per pass through the loss modulator medium (31A, 32A) of the loss modulation device (31, 32), and - the laser resonator is configured such that a beam diameter of the circulating laser field in the modulator medium (31A, 32A) of the loss-modulation device is less than the beam diameter in the gain medium, so that the nonlinearity inside the resonator is dominated by the modulator medium (31A, 32A) of the loss-modulation device, wherein the nonlinear phase shift ΔΦ inside the modulator medium (31A, 32A) per pass through the modulator medium is at least ΔΦ total /3, with ΔΦ total being a total nonlinear phase shift within the laser resonator.