Development of a solid-state femtosecond laser based on YB/sup 3+/ : KGW for precise optical measurements

Recently much progress in the measuring of optical frequencies has been achieved owing to the use of femtosecond lasers. The paper is devoted to the development of a specialized laser based on Yb/sup 3+/ : KGW as an alternative for Ti: Sa fermosecond laser widely used now. We describe various variants of the resonator design, measure the pump power-threshold and absorption factor. Intracavity losses are also estimated.