Abstract

We report on a femtosecond high-power regenerative amplifier based on ${\mathrm{Yb}\text{:}\mathrm{Lu}}_2{\mathrm{O}}_3$. Exploiting the excellent thermo-mechanical properties of this material, we were able to achieve up to 64.5 W in continuous-wave regime, limited only by the available pump power. In pulsed operation, 42 W of average output power at a repetition rate of 500 kHz with 780 fs long pulses could be demonstrated, resulting in a pulse peak power of $\sim 100\mathrm{MW}$. The spectrum was centered at 1034 nm with an FWHM of 2.4 nm, potentially allowing for even shorter pulses. At the maximum output power the beam was nearly ${\mathrm{TEM}}_{00}$, with an ${\mathrm{M}}^2$ value of 1.2 in both axes.

© 2016 Optical Society of America

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