General synchronization of chaos in a system of two non-identical lasers

General synchronization of the chaotic intensity fluctuations of two spatia lly coupled Nd:YAG lasers with pump modulation is investigated theoreticall y when the losses of the two lasers are different. It is shown that the cha otic synchronization still exists for medium coupling even though the two l asers are different. For strong coupling the system shows periodic motion o f laser intensities. While for weak coupling, the two lasers oscillate inde pendently It is obvious that the increase of difference between the two las ers reduces the degree of chaotic synchronization.