Crystal growth, spectroscopic characterization, and sub-100 femtosecond mode-locked operation of a Yb:LiLuF4 laser

We present a comprehensive growth, spectroscopic, and laser performance investigation of a Yb:LiLuF4
crystal, including CW laser experiments, and, for the first time to the best of our knowledge, mode-locked laser
operation. Pumping with two 400 mW, polarization-combined, single-mode fiber-coupled laser diodes, we demonstrated
efficient CW emission with 140 mW maximum output power and up to 59% slope efficiency. Using a
semiconductor saturable absorber mirror for inducing the mode-locked regime and a pair of fused silica prisms for
intracavity group delay dispersion compensation, we obtained soliton mode-locking pulses with 90 fs duration
for the emission with polarization parallel to the crystal c-axis and 113 fs for the orthogonal polarization, with
average power exceeding 30 mW in both cases at about a 90 MHz repetition rate.