We report a single-mode diode-pumped, passively mode-locked Cr:LiSAF laser with gigahertz (GHz) repetition rate and kilowatt peak power. A low-loss saturable Bragg reflector with low modulation depth and optimized dispersion compensation mirrors enables the generation of stable, cw mode-locked, sub- $100\text{-}\mathrm{fs}$ pulses at $1\mathrm{GHz}$ repetition rate around $865\mathrm{nm}$ when pumping with four or six laser diodes. Using a 0.25% output coupler and a total absorbed pump power of $0.9\mathrm{W}$ from six laser diodes, 55 fs, 110 pJ pulses are produced. This corresponds to $1.8\mathrm{kW}$ of peak power, which to our knowledge represents a record result for GHz Cr:colquiriite lasers.

© 2010 Optical Society of America

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