Abstract: A High-power sum frequency generator system including a first electromagnetic source for generating a first fundamental field and a second fundamental field emitted along a propagation path, and a first nonlinear component and a second nonlinear component arranged in series along the propagation path. The first nonlinear component generates a first sum frequency field from the first fundamental field and the second fundamental field, the first sum frequency field having a first polarization. The second nonlinear component generates a second sum frequency field from the first and second fundamental fields, the second sum frequency field having a second polarization. The system has an output that includes the first sum frequency field and the second sum frequency field, and a direction of the first polarization forms a mutual angle with a direction of the second polarization such that the two polarizations are non-parallel.

Abstract: 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.