doi.org/10.1364/JOSAB.7.002150
J. Opt. Soc. Am. B
Ultrafast Spectroscopy

Planken, P., Bakker, H., Kuipers, K.& Lagendijk, A. (1990). Frequency chirp in optical parametric amplification with large phase mismatch in noncentrosymmetric crystals. J. Opt. Soc. Am. B, 7, 2150–2154.https://doi.org/10.1364/JOSAB.7.002150