Figure 2
(a) Diagram of SH generated at the interface of BBO (\({\chi }_{1}^{\mathrm{(2)}}\)) and another medium (\({\chi }_{2}^{\mathrm{(2)}}\)). (b) Simulation result under the condition \({\chi }_{1}^{\mathrm{(2)}}={\chi }_{2}^{\mathrm{(2)}}\) which presents a homogeneous nonlinear coefficient environment. (c) and (d) are distributions of SH generated on BBO boundary (\({\chi }_{2}^{\mathrm{(2)}}=0\)) and the interface of BBO and LN (\({\chi }_{2}^{\mathrm{(2)}}=13{\chi }_{1}^{\mathrm{(2)}}\)), respectively. The colors indicate the intensities of SH. The radiation angle of these two cases is the same and the intensity in (d) is higher than that in (c).
