The invention relates to a laser system for skin treatment and a method for treatment of skin. The laser system comprises a first laser resonator comprising at least a first gain medium for generating a first optical field along a first optical axis. The first laser resonator further comprises a first reflective element and a partly reflective first output coupler. The laser system also comprises a second laser resonator comprising at least a second gain medium for generating a second optical field along a second optical axis. The second laser resonator further comprises a second reflective element and a partly reflective second output coupler. The laser system comprise at least one nonlinear medium for generating a third optical field along a third optical axis by a nonlinear interaction between the first optical field and the second optical field. Finally, the laser system comprises an optical output port capable of delivering the first optical field, the second optical field, and the third optical field to an output, and at least one optical pump source for optically pumping the first gain medium and the second gain medium.