Abstract: The present invention relates to a method and to an arrangement for the frequency conversion of coherent optical radiation with adjustable wavelength by way of a two-stage non-linear optical process. In the method and the arrangement, a frequency doubling is carried out in a first non-linear optical crystal (301, 302) and a sum frequency generation or a frequency doubling is carried out in a second non-linear optical crystal (401, 402) which is connected downstream. A positively birefringent crystal, in which the frequency doubling is carried out during a phase matching of type I from the extraordinary wave of the output frequency according to the <eeo> scheme, is used as the first non-linear optical crystal (301, 302). The second non-linear optical crystal (401, 402) is chosen such that phase matching is made possible by rotating the crystal in the same spatial plane in which the first crystal (301, 302) must also be rotated during a phase matching.

Abstract: The present invention relates to a method and to an arrangement for the frequency conversion of coherent optical radiation with adjustable wavelength by way of a two-stage non-linear optical process. In the method and the arrangement, a frequency doubling is carried out in a first non-linear optical crystal (301, 302) and a sum frequency generation or a frequency doubling is carried out in a second non-linear optical crystal (401, 402) which is connected downstream. A positively birefringent crystal, in which the frequency doubling is carried out during a phase matching of type I from the extraordinary wave of the output frequency according to the <eeo> scheme, is used as the first non-linear optical crystal (301, 302). The second non-linear optical crystal (401, 402) is chosen such that phase matching is made possible by rotating the crystal in the same spatial plane in which the first crystal (301, 302) must also be rotated during a phase matching.