An electric-field poling process was established that yielded uniform periodically poled lithium niobate (PPLN) in 0.5 mm thick lithium niobate substrate. We have fabricated 50 mm long fanned as well as multigrating PPLNs having period variations from 25 𝜇m to 32 𝜇m. These PPLNs are required for quasi-phase-matched (QPM) optical parametric oscillator (OPO) applications. We have also configured a bench-top OPO set-up based on these PPLNs.

In this study, we used the generalised exponential rational function method (GERF method) to find a new family of solitary wave solutions of the modified chemotaxis equation accounting for short-range and long-range diffusion. The presented solutions exhibit various classes of solitary waves, i.e. bell-shaped and kink–antikink solitary wave solutions under certain constraint relations. We have used a different source function for the attractant as well as species density taking inspiration from the existing models. We have also presented 3D and 2D plots toexplain the behaviour of the obtained family of solutions.