Abstract

We present experimental evidence showing that the period of the rippled surface structure induced on germanium by 1.06-μm laser pulses undergoes a discontinuous shift above a certain threshold intensity. The measured shift, as a function of the angle of incidence of the damaging beam, is quantitatively interpreted as a transition between a regime of inhomogeneous melting controlled by radiation-remnant field structures and a regime of ripple formation involving surface plasmons in an optically thick layer of liquid, metallic germanium formed at the surface.

© 1983 Optical Society of America

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