Broadband optical frequency comb light source

摘要

PROBLEM TO BE SOLVED: To provide an optical frequency comb light source capable of converting a wavelength of an optical frequency comb with high efficiency in a wide band including a visible region by using a chirp PPLN waveguide in which a polarization reversal period changes, and a design method thereof. An optical frequency comb light source of the present invention amplifies a source optical frequency comb generator 1 that generates a source optical frequency comb having a comb-shaped spectrum in which peaks are arranged at equal intervals on a frequency axis, and a source light frequency comb. A fiber amplifier 2 is provided, and a nonlinear optical medium 3 that receives an amplified original optical frequency comb as an input and emits a second-order nonlinear optical effect. The nonlinear optical medium 3 uses the light of a large number of frequency groups (f) included in the input original optical frequency comb as the original light, and the second harmonic group and the sum of the original light are produced by the sequential second-order nonlinear optical effect. It outputs light including a frequency group (2f), a sum frequency group of f and 2f (3f), a second harmonic group of 2f, and a sum frequency group of f and 3f (4f). [Selection diagram] Fig. 1