| abstract |
The invention relates to a method and an optical arrangement (10) for generating a nonlinear optical signal (17) on a material (16) which is excited by an excitation field (2). With the excitation field, coherent fields of first and second optical pulses of different frequencies are overlapped in the material (16) both temporally and spatially. The first pulse of a first frequency is generated in a first beam (3) of a first optical generator unit (1), and the second pulse of a second frequency is generated in a second beam (8) of a second optical generator unit which is synchronously pumped by the first optical generator unit (1). With the first pulses of the first frequency as the fundamental frequency pulse (5) of a higher harmonic frequency, the same is generated, and the second optical generator unit (7) is pumped with the pulses of the higher harmonic frequency. According to the concept of the invention, the method proposes that the second optical generator unit (7), as an optical parametric generator unit, generates pulses of an idler frequency in an idler beam for producing the second pulse 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. |