  Research activities on laser plasma accelerators are paved by many
significant breakthroughs. This review article provides an opportunity to show
the incredible evolution of this field of research which has, in record time,
allowed physicists to produce high quality electron beams at the GeV level
using compact laser systems. I will show the scientific path that led us to
explore different injection schemes and to produce stable, high peak current
and high quality electron beams with control of the charge, of the relative
energy spread, and of the electron energy.
