We demonstrate a new scheme for dispersion compensation in femtosecond laser cavities, exploiting the observation that the negative dispersion from a Brewster interface can be strongly enhanced by the focusing effect of a curved surface on a prism or of a thermal lens in the gain medium. Based on this scheme, a high-power Nd:glass laser generated femtosecond pulses without a prism pair. We present a detailed analytical, numerical, and experimental analysis of the discovered dispersion effects. Also, we anticipate the application of these effects for compensation of higher-order dispersion in a broad bandwidth, using a specially designed nonspherically curved mirror surface.
© 2000 Optical Society of America
R. Paschotta, J. Aus der Au, and U. Keller, "Strongly enhanced negative dispersion from thermal lensing or other focusing effects in femtosecond laser cavities," J. Opt. Soc. Am. B 17, 646-651 (2000)