Abstract
Transmittance self-oscillation discovered in amorphous GeSe2 films has attracted considerable interest, while its underlying mechanism remains controversial. We suggest that the oscillation is governed by at least two kinds of changes; one occurs in absorption for thin ([Formula: see text]m) films and the other in refractive-index for thick ([Formula: see text][Formula: see text]mm) plates. We also detail a model, which assumes recoverable micro-crystallization. An idea for increasing the oscillation frequency is proposed for possible applications.
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