  High energy photon - photon collisions can be achieved by adding high average
power short-pulse lasers to the Linear Collider, enabling an expanded physics
program for the facility. The technology required to realize a photon linear
collider continues to mature. Compton back-scattering technology is being
developed around the world for low energy light source applications and high
average power lasers are being developed for Inertial Confinement Fusion.
