Enhancement effect of cumulative second-harmonic generation by closed propagation feature of circumferential guided waves

Gao Guang-Jian¹, Deng Ming-Xi^{2, †}, Hu Ning², Xiang Yan-Xun^{3, ‡}

Curves of normalized βR(n=1) , Δβ_R and Δβ′R versus the scale coefficient of TOECs.