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Collaborators from Ireland and China have demonstrated a method to develop an octave-spanning coherent optical comb with a much lower pump power compared with other techniques that require complicated controlling equipment. The photonic system introduced by the collaborators to create broadband optical combs with high coherence is an enabling technology for optical communications, with applicability to optical frequency synthesis, optical clocks, dual-comb spectroscopy, and lidar.
In the time domain, an optical frequency comb consists of a series of ultrashort pulses with equal separation in time. In the frequency domain, it is a spectrum that consists of a series of discrete, equally spaced frequency lines (that is, colors). Much…READ MORE