Abstract
We have developed a promising scheme of a multimode-diode-pumped ytterbium laser. The Yb : KYW laser in the cw regime demonstrates record-high differential (40 %) and total optical (35 %) efficiencies. Mode locking is realised, which allows the scheme to be used for the development of compact laser systems, such as mobile femtosecond precision synthesisers. The peculiarities of the laser operation and ways of further improving its efficiency are discussed.
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