Abstract

For quasi-phase-matching (QPM) technique, much research has been done for purpose of obtaining efficient frequency conversion where the largest nonlinear coefficient (corresponding to ee ➔ e process) is used. However, these crystals do have other considerable nonlinear coefficients. In these cases, QPM parametric interactions such as oo ➔ e, oe ➔ o and eo ➔ e process can be realized efficiently. From the viewpoint of coupling, the conventional harmonic generation with largest nonlinear coefficient should be treated as a particular case, the coupling of second-order parametric interactions based on different nonlinear second-order processes could be considered as a more general situation.

© 2016 Japan Society of Applied Physics, Optical Society of America