SHORT-WAVELENGTH LIGHT SOURCE

摘要

A short-wavelength light source has such a structure that in a non-linear crystal having cyclic polarized reversed structure, the polarized reversed structure is divided into a plurality of regions and in each of the regions, the polarized reversed structure and the basic wave optical axis are inclined with different angles, so that higher harmonic generated is divided into a plurality of beams. By dividing the higher harmonic component into a plurality of beams, it is possible to reduce the power density of the higher harmonic and generate walk off in the higher harmonic and the basic base, thereby suppressing generation of the sum frequency of the basic wave and the higher harmonic so as to improve a high output resistance. This suppresses SFG generation and realizes a high-output coherent light source.