The disk laser was invented more than 15 years ago by our partner Dr. Adolf Giesen and his coworkers at University of Stuttgart. Since then, commercial disk lasers in all power classes are available, ranging from few watts to several kilowatts. The main advantages of the thin disk geometry are:
- Power and pulse energy scaling to much higher values than with rods, fibers or slabs and
- efficient intra-cavity frequency conversion.
Disk lasers are used for medical treatment as well as for micro or macro machining in the industry. The number of disk lasers is rapidly increasing worldwide.
Based on solid state laser technology the disk laser consists basically of a very thin laser medium combined with an optical multipass pump system. By using fibers or glass rods for transport and homogenization, diode lasers from bars to stacks can easily be coupled into the multipass system. The demands on brightness of the pumping diodes are comparably low. Due to the geometry of the crystal, the homogeneous pump profile and the axial cooling, the crystals show an extremely marginal thermal lens. In addition, the depolarization caused by the active medium is also very low.