The coherence length of a Nd:YAG laser with an intra-cavity SBS cell has be
en investigated interferometrically. It is shown that the coherence length
decreases with increasing output pulse energy, and is limited by the pulse
width when the pulse energy is much higher than the lasing threshold. Coher
ence lengths as short as 16 mm have been measured for pulse widths of 50 ns
and energies greater than or equal to 20 mJ. (C) 2000 Published by Elsevie
r Science B.V. All rights reserved.