Quasipositivity of links of divides and free divides

As an extension of the class of algebraic links, AʹCampo constructed links associated to relatively immersed arcs in a two-dimensional disk. Hirasawa gave an algorithm to draw diagrams of such links. By using his algorithm, we show that such links are quasipositive. Furthermore, we extend this result to links associated with non-relatively immersed arcs and loops by Gibson and Ishikawa.