We show that the cavity round-trip Gouy phase leads to pulse-to-pulse variation of the absolute phase and temporal profile of circulating few- or single-cycle pulses in empty resonators. This pulse-to-pulse variation can be eliminated by the proper insertion of a lens into the cavity. An application to terahertz resonators with phase-locked feedback is discussed.
© 2000 Optical Society of America
Simin Feng and Herbert G. Winful, "Cavity phase engineering for stable enhanced terahertz pulse trains," J. Opt. Soc. Am. A 17, 2096-2100 (2000)