Large deuterium clusters were produced in a supersonic expansion of high pressure gases into vacuum through a 0.5 mm nozzle.The average size clusters(with 3×103 atoms) was verified by measuring the Rayleigh scattered signal using a He-Ne laser beam.Neutrons(2.45 MeV) from deuterium clusters fusion induced by the intense femtosecond(30 fs) laser pulse is experimentally demonstrated.The average neutron yield of 1×103 per shot was obtained.The yield grew slightly with the increasing of the laser spot size.No neutron was observed when the laser spot was larger than 470 micron.The fusion events mainly happened in the hot plasma region radiated by the intense laser.

High energy electron acceleration in a wake field generated in the intense ultrashort (30 fs) laser pulse cluster gas jet interaction is experimentally demonstrated. Relativistic electrons with energy of 60 MeV were observed. These high energy electrons split into two beams due to the relativistic self-focusing of the laser.