Optics Letters · 1991 · 57 citations · 10 references
Natural SciencesMaterials SciencePhysicsOpticsSemiconductor MaterialsSurface ScienceLaser PhysicsSemiconductor DefectsSemiconductor PhysicsSemiconductor SurfacesSurface PhysicsUltrafast OpticsDisordered SemiconductorsExcitationFemtosecond Laser PulsesLattice DefectsReflectivitySurface DisorderUltrafast Laser ExcitationUltrafast Optical Response
An abrupt (less than 100 fs) decrease in the second-harmonic intensity reflected from the surface of a GaAs (110) wafer has been observed experimentally. The linear reflectivity was found to increase on a time scale of ~1 ps. Thus the concept of fast atomic disorder induced by electronic excitation within a relatively cold lattice is given new experimental support.
10