Abstract

An $\mathrm{Yb}\text{:}{\mathrm{CaF}}_2$ laser pumped by two 400-mW single-mode laser diodes at 976 nm is reported to generate Fourier-limited 65-fs pulses, the shortest to date achieved with a semiconductor saturable absorber mirror (SESAM) mode-locking and this laser material to date. With a multimode pump diode, we have demonstrated higher average output powers of up to 1.4 W with 87-fs pulses. Key to these successful results was the implementation of practical design guidelines allowing safe mode-locking operation without $Q$-switching instabilities, which appear to damage the SESAMs more easily in $\mathrm{Yb}\text{:}{\mathrm{CaF}}_2$ oscillators compared to other Yb-doped materials.

© 2015 Optical Society of America

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