Abstract: A system for generating an optical frequency standard is described. The system is based on a two-color approach and includes a first laser source that generates a first laser output at a first frequency and a second laser source that generates a second laser output at a second frequency corresponding. The first and second laser outputs are then respectively input into first and second harmonic generators to form frequency-doubled first and second laser outputs. The system also includes a two-color stabilization arrangement to stabilize the sum of the frequencies generated by first and second laser sources, including, for example, an interaction region incorporating a laser active material. The interaction region can be a gas reference cell and the laser active material can be Rubidium (in vapor form) having a two-photon transition.

Abstract: A system for generating an optical frequency standard is described. The system comprises a first laser source for generating a first laser output at a first frequency, a first second harmonic generator receiving as an input the first laser output to generate a frequency-doubled first laser output at a doubled first frequency, a second laser source for generating a second laser output at a second frequency different from the first frequency and a second harmonic generator receiving as an input the second laser output to form a frequency-doubled second laser output at a doubled second frequency.