Overview: Provides a general coverage of the fantastic progress in the past few years on ultrawide bandwidth optical frequency combs and their applications to ultrafast science, frequency metrology, and precisiOver the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while
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