This manuscript investigates the effect of the chirp factor on the relativistic self-focusing of a Gaussian chirped pulse laser in collisional quantum plasmas. Nonlinear equations are derived to describe the propagation of a linear chirped laser frequency; afterward. by considering dielectric function obtained by quantum kinetic equation and BGK collision integral in coordinate space.... https://allfixelectricales.shop/product-category/spst-9v-relay/