What is Fiber disk laser?

A fiber disk laser is a fiber laser with transverse delivery of the pump light. They are characterized by the pump beam not being parallel to the active core of the optical fiber , but directed to the coil of the fiber at an angle. 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 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.