Optical synchronization system for femtosecond X-ray sources

A high accuracy optical synchronization system comprising:

• a) an input laser system capable of generating an input laser signal, with an associated input laser signal frequency, from a first continuous wave laser and a second continuous wave laser located environmentally independent of the first continuous wave laser;
• and
• b) a system that synchronizes within a few femtoseconds a plurality of discrete frequencies phase locked to the input laser signal comb frequencies among a plurality of independently located devices with a temporal offset,
• wherein the system that synchronizes comprises:
• a) a first phase lock for a first wavelength λ1 to a first frequency component of the input laser signal system to the first continuous wave laser operating at wavelength λ1;
• b) a second phase lock for a second wavelength λ2 to a second frequency component of the input laser signal system to the second continuous wave laser operating at wavelength λ2;
• and
• c) a laser output transmitted to one or more distant laser systems to be temporally locked to the input laser comprising:
• i) a λ1 output from the first continuous wave laser operated at wavelength λ1 and
• ii) a λ2 output from the second continuous wave laser operated at wavelength λ2.