title: Nonlinear focusing of femtosecond pulses as a result of self-reflection from a saturable absorber.
abstract: We calculate the spatiotemporal evolution of intense, femtosecond pulses that are incident upon a saturable absorbing interface in the regime of self-reflection, using the finite-difference time-domain computational method. The pulses induce a curved, moving absorption front in the nonlinear medium that acts as a transient focusing mirror for the reflected pulse energy.
authors.forename: W
authors.initials: W
authors.lastname: Forysiak
authors.forename: J V
authors.initials: JV
authors.lastname: Moloney
authors.forename: E M
authors.initials: EM
authors.lastname: Wright