METHOD AND OPTICAL ARRANGEMENT FOR GENERATING A NONLINEAR OPTICAL SIGNAL ON A MATERIAL WHICH IS EXCITED BY AN EXCITATION FIELD, AND USE OF THE METHOD AND OF THE OPTICAL ARRANGEMENT

摘要

The invention concerns a method of and an optical arrangement (10) for generating a non-linear optical signal (17) on a material (16) excited by an excitation field (2), wherein with the excitation field (2) coherent fields of first and second optical pulses of differing frequency are overlapped in the material (16) in temporal and spatial relationship, wherein the first pulses of a first frequency are generated in a first beam (3) of a first optical generator unit (1), and the second pulses of a second frequency are generated in a second beam (8) of a second optical generator unit (7) synchronously pumped by the first optical generator unit (1), wherein with the first pulses of the first frequency as a fundamental frequency pulses (5) of a higher harmonic frequency thereof are generated and the second optical generator unit (7) is pumped with the pulses of the higher harmonic frequency. In accordance with the concept of the invention the method provides that the second optical generator unit (7) as an optical parametric generator unit generates pulses of an idler frequency in an idler beam for providing the second pulses of the second frequency in the second beam (8), wherein the second frequency is smaller than the first frequency, and the second optical generator unit generates pulses of a signal frequency in a signal beam (9), wherein the second frequency is smaller than the signal frequency.