Optical frequency metrology with femtosecond laser pulses

Abstract

Summary form only given. We explore the possibilities of frequency combs generated by femtosecond lasers in ultra high precision spectroscopy on atomic hydrogen at the 10/sup -14/ level and we have done fundamental tests of the fs frequency comb technique down to the 10/sup -21/ level. Further applications arise in the time domain where now the phase slip between carrier and envelope of such pulses can be controlled.