Patent ID: 7474457

Claim:
A method for generating radiation with a stabilized frequency, wherein laser light pulses are generated with a repetition frequency f r by means of a mode-locked laser source, said laser light pulses comprising a plurality N of frequency components f n , with f n =n·f r +f 0 , wherein n=1, 2 . . . N, and f 0 represents an offset frequency, and the laser light pulses are coupled into a non-linear optical medium, wherein by means of said non-linear optical medium, both difference frequency generation and self phase modulation are performed, such that a difference frequency component f d =(k−1)·f r =f k −f 1 =(k·f r +f 0 )−(1·f r +f 0 ) is generated, wherein k, 1 are integers, with f k =k·f r +f 0 and f 1 =1·f r +f 0 , and a self phase modulation frequency component f SPM =(k−1)·f r +f 0 =f d +f 0 is generated, in that the beating frequency f CEO =f 0 =f SPM −f d between the frequencies f d and f SPM obtained by means of said non- linear optical medium is detected, and in that the value of the detected beating frequency f CEO =f 0 is stabilized.