Patent ID: 8971374
Filing Date: 2015-03-03
Classification: G02B,G02F,H01S

Abstract:
1. Device for generating electromagnetic radiation, said device comprised of a light source ( 1 ) generating a first radiation ( 7 ) at a fundamental wavelength, an optical resonator ( 2 ) in which the first radiation ( 7 ) circulates, and a frequency multiplier ( 8 ) located in the resonator ( 2 ) which converts the first radiation ( 7 ) at least partly into a second radiation ( 9 ) at a second or higher harmonic wavelength, wherein the said frequency multiplier ( 8 ) comprises at least one non-linear crystal ( 10 ) wherein at least one beam splitter element ( 12 ) passed through by the first radiation ( 7 ) and the second radiation ( 9 ) is coupled to the non-linear crystal ( 10 ), wherein the first radiation ( 7 ) and the second radiation ( 9 ) leave the beam splitter element ( 12 ) each in a different spatial direction, wherein the resonator ( 2 ) comprises two or more reflectors ( 3 , 4 , 5 , 6 ) which according to the spatial directions in which the first and the second radiation ( 7 , 9 ) leave the beam splitter element ( 12 ) are so arranged, aligned and/or shaped that only the first radiation ( 7 ) circulates in the optical resonator ( 2 ) and the second radiation ( 9 ) leaves the optical resonator ( 2 ), wherein at least one of the reflectors ( 6 ) is so arranged, aligned or shaped that it only reflects the first radiation ( 7 ) and wherein the second radiation ( 9 ) passes the reflector.