@article{305, author = {Jun Ye and John Hall and Scott Diddams}, title = {Precision phase control of an ultrawide-bandwidth femtosecond laser: a network of ultrastable frequency marks across the visible spectrum}, abstract = {We demonstrate that the stability of the current optical frequency comb generated by a Kerr-lens mode-locked femtosecond laser is limited by the microwave reference used for phase locking the comb spacing. Hence we implement precision frequency/phase control of the entire comb to the fundamental and second-harmonic frequencies of a stable cw laser without any external microwave reference. The stability of a cw iodine-stabilized laser is transferred to millions of comb lines (with an instability of 3 × 10-13) covering more than one octave of the optical frequency spectrum. In addition, the mode spacing of the comb can be used as a stable microwave frequency derived directly from a stable optical oscillator.}, year = {2000}, journal = {Optics Letters}, volume = {25}, pages = {1675}, month = {2000-01}, issn = {0146-9592}, doi = {10.1364/OL.25.001675}, }