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We present a detailed description of the design, construction, andperformance of high-power ultrafast Yb:fiber laser frequency combs in operationin our laboratory. We discuss two such laser systems: an 87 MHz, 9 W, 85 fslaser operating at 1060 nm and an 87 MHz, 80 W, 155 fs laser operating at 1035nm. Both are constructed using low-cost, commercially available components, andcan be assembled using only basic tools for cleaving and splicing single-modefibers. We describe practical methods for achieving and characterizinglow-noise single-pulse operation and long-term stability from Yb:fiberoscillators based on nonlinear polarization evolution. Stabilization of thecombs using a variety of transducers, including a new method for tuning thecarrier-envelope offset frequency, is discussed. High average power is achievedthrough chirped-pulse amplification in simple fiber amplifiers based ondouble-clad photonic crystal fibers. We describe the use of these combs inseveral applications, including ultrasensitive femtosecond time-resolvedspectroscopy and cavity-enhanced high-order harmonic generation.

High-power ultrafast Yb:fiber laser frequency combs using commercially available components and basic fiber tools