We report the characterization of a new pulse stretcher that provides a linear and positive variation of the group delay as a function of the optical frequency. It consists of a perpendicular chirped-grating pair introduced by Tournois [Opt. Commun. 106, 253 (1994)] that allows 20-fs pulses to be stretched to 100 ps. The system is tested by short-pulse spectral interferometry. We designed and realized the chirped gratings by phase volume holographic recording in a highly efficient photopolymer.
© 1996 Optical Society of America
B. Loiseaux, A. Delboulbé, J. P. Huignard, P. Tournois, G. Cheriaux, and F. Salin, "Characterization of perpendicular chirped phase volume grating pairs for laser pulse stretching," Opt. Lett. 21, 806-808 (1996)