S. Ralph, T. G. Ulmer, B. R. Washburn, C. M. Verber, and A. J. S. Thorpe, "Resonant-cavity-enhanced surface-emitted second-harmonic generation optimized for short pulses,"
in Ultrafast Electronics and Optoelectronics, A. Sawchuk, ed.,
Vol. 49 of OSA Trends in Optics and Photonics
(Optical Society of America, 2001), paper UWC4.