Taking advantage of the slow optical response of low-temperature rare earth ion–doped crystal, we explore the similarity between causality and Fresnel diffraction by a straight edge. We relate these features to spectral resolution and selectivity. The concept is illustrated with experimental data.
© 2000 Optical Society of America
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4790) Fourier optics and signal processing : Spectrum analysis
(300.6240) Spectroscopy : Spectroscopy, coherent transient
Loïc MÃnager, Ivan Lorgerë, and Jean-Louis Le GouÃt, "Fresnel diffraction on the edge of causality," Opt. Lett. 25, 1316-1318 (2000)