The effect of stress on the frequency conversion efficiency of the large aperture frequency converter

摘要

Large aperture frequency converters are important components of the high-power laser system. It is often composed of a cascaded KDP (Potassium Dihydrogen Phosphate) crystal and dKDP (potassium deuterium phosphate) crystal system. The effect of the stress distribution of KDP crystal on the second harmonic generation (SHG) efficiency has been studied. It is found that the phase mismatch has a linear relationship with unidirectional stress. The result of the case study shows that the stress-induced phase mismatch in the SHG process is needed to be paid more attention to in engineering.