Request InfoTOPTICA Photonics Inc.New offset-free optical frequency combs from Toptica Photonics Inc. enable unprecedented passive stability for complex experiments. The difference frequency comb (DFC) operates with Cero technology (zero-νCEO), which obtains a phase-stable laser output with an inherently vanishing frequency offset. To achieve this, femtosecond laser pulses centered at 1560 nm are generated with a mode-locked Er3+-doped fiber oscillator. Subsequent amplification and coherent spectral broadening of the pulses in a nonlinear fiber creates a broad supercontinuum. 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