High-power planar dielectric waveguide lasers

The advantages and potential hazards of using a planar waveguide as the hos t in a high-power diode-pumped laser system are described. The techniques d iscussed include the use of proximity-coupled diodes, double-clad waveguide s, unstable resonators, tapers, and integrated passive Q switches. Laser de vices are described based on Yb3+-, Nd3+-, and Tm3+-doped YAG, and monolith ic and highly compact waveguide lasers with outputs greater than 10 W are d emonstrated. The prospects for scaling to the 100 W level and for further i ntegration of devices for added functionality in a monolithic laser system are discussed.