We propose focusing by a Fresnel zone plate into a pinhole as a cost-efficient, rugged component for wavelength selection in femtosecond pulses. We show measurements of the frequency selectivity of a Fresnel zone plate for an ultra-broadband supercontinuum pulse. We verify that our zone plate does not considerably stretch the 65 fs laser pulses in time.

Opt. Commun.

Gürtler, A., Gilijamse, J. J., Wetzels, A., Noordam, L. D., Sali, E., & Bellini, M. (2007). Frequency selection of supercontinuum ultrashort pulses using a Fresnel zone plate. Opt. Commun., 270, 336–339. doi:10.1016/j.optcom.2006.09.029