This paper is devoted to the spatio-temporal behaviour of internal fields c
reated by an ultrashort pulse of light inside a spherical cavity. The chara
cteristic length of the pulse in free space is shorter than the cavity diam
eter, leading to a temporal separation of optical modes. The elastic intern
al intensity is displayed versus time. (C) 2001 Published by Elsevier Scien
ce B.V.