Second Harmonic Generation, Beam Dynamics and Spatial Soliton Generation in Periodically Poled KTiOPO₄

Quadratic spatial solitons

“…The appearance of two additional solitons at an input intensity three times that of the single soliton threshold is shown in Figs. 13(d) and (f) respectively [43,44]. These results are in excellent agreement with simulations of the propagation equations, as shown for the fundamental in Fig.…”

“…14(b). The simulations show that when the radiation is sufficiently intense, radiation along the axis exhibiting the slowest diffraction coalesces into additional solitons, leading to the three soliton pattern along a line [44,45]. Another effect which has been shown to lead to lines of multiple solitons is input beam asymmetry [45].…”

“…Shown in Fig. 13 is a collage of outputs from a PPKTP crystal for increasing fundamental intensity input into the crystal on phase-match [43,44]. Fig.…”

Second Harmonic Generation in AlGaAs Nanowaveguides

“…However, this cannot be easily achieved in an arbitrary geometry due to the inherent material dispersion. For momentum conservation to be satisfied, bulk birefringent crystals (such as BBO and KTP) [2,3] as well as waveguide geometries (in polymers [4], LiNbO 3 [5,6], and semiconductors [7][8][9][10][11]) have been successfully used. The latter solution has recently gained a significant amount of scientific attention, resulting in the development and improvement of several phase-matching techniques in waveguiding structures.…”