1-GHz repetition rate femtosecond OPO with stabilized offset between signal and idler frequency combs.
Gebs R, Dekorsy T, Diddams SA, Bartels A. 1-GHz repetition rate femtosecond OPO with stabilized offset between signal and idler frequency combs. Opt Express. 2008 Apr 14; 16(8):5397-405.