Crucial effects of coupling coefficients on quasi-phase-matched harmonic generation in an optical superlattice.
Coupling of optical parametric processes in an optical superlattice through quadratic nonlinearity was analyzed theoretically. Solving the coupled equations, we found that efficient quasi-phase-matched third-harmonic (TH) generation depends not only on the magnitude of the coupling coefficients but also on their ratio. Theoretically, all the fundamental energy can be transferred to the TH at a particular ratio. In other cases, there exists an optimum condition that corresponds to a maximum TH conversion efficiency. The result is of practical importance for the design of TH devices.
Zhang
C
C
Zhu
Y Y
YY
Yang
S X
SX
Qin
Y Q
YQ
Zhu
S N
SN
Chen
Y B
YB
Liu
H
H
Ming
N B
NB