Reflectivity Changes In GST225 Thin Film Induced By Laser Pulses With Variable Duration

Phase transitions of GST225 thin films with a thickness of 150 nm were induced by laser pulses with durations ranging from 20 to 140 ns and energies ranging from 1 to 15 μJ. The transitions lasted from 0.4 to 0.6 μs, and the optical contrast reached up to 90%. The study also demonstrated the possibility of two-level transitions.