 This allows use of the specific shape of the pump beam emitted by the laser diode, providing the efficient use of the pump.Fiber disk lasers should not be confused with the LaserDiscs (disk-shaped devices for storage and reading of information with laser beam) nor the disk laser or "active mirror", which is a laser with a thin active layer where the heat sink is realized in a direction opposite to that of propagation of the output beam.First disk lasers were developed in the Institute for Laser Science, Japan.