In this paper, we implement a scheme to combine six coherent, spatially separated Raman sidebands generated in single-crystal diamond into a collinear beam. With appropriate phase tuning, this results in a pulse much shorter than the generating pump. We elucidate the characteristics of the synthesized pulse by using an interferometric collinear cross-correlation frequency-resolved optical gating setup. The beating of the synchronized sidebands results in an additional component in the signal, which we use to optimize the relative phases of our sidebands. In this way, we synthesize and measure visible-range, nearly single-cycle isolated pulses of approximately 5-fs total pulse duration.

• Received 14 March 2020
• Accepted 10 July 2020

DOI:https://doi.org/10.1103/PhysRevA.102.013520