We describe the optical systems of the six Antares Laser Power Amplifiers. These assemblies are preceded by the front-end optics and followed by the target system. Each power amplifier receives an annular input beam and divides it into 12 beams which are then directed to double pass them through 12 gain regions surrounding a central electron gun. Provisions are being made for spatially filtering each beam and for the possibility of adding saturable absorbers. Two keys to the successful completion of the power amplifier are: (1) the avoidance of unwanted lasing modes and hot spots in the wavefronts, and (2) the maintenance of alignment throughout the entire laser system, including the internal alignment of the Power Amplifier. The goal has been to minimize alignment problems by careful and simplistic design of the mountings, stressing modular assemblies and accessibility. We have succeeded in designing to average energy densities of 2.0 J/cm2 for salt windows and 3.0 J/cm2 on copper mirrors, while extracting the largest possible energy from the volume of gas which is electrically pumped.