We describe theoretically and verify experimentally a novel class of diffraction-free pulsed optical beams that are 'omni-resonant': they have the remarkable property of transmission through planar Fabry-Pérot resonators without spectral filtering even if their bandwidth far exceeds the cavity resonant linewidth. Ultrashort wave packets endowed with a specific spatio-temporal structure couple to a single resonant mode independently of its linewidth. We confirm that such 'space-time' omni-resonant wave packets retain their bandwidth (1.6 nm), spatio-temporal profile (1.3-ps pulse width, 4-µm beam width), and diffraction-free behavior upon transmission through cavities with resonant linewidths of 0.3-nm and 0.15-nm. arXiv:1912.00092v1 [physics.optics]

A unique class of pulsed fields of arbitrary spectral profiles and bandwidths is demonstrated theoretically and experimentally that can traverse a Fabry-Pérot Cavity invariantly even when far exceeding cavity resonant linewidth.

We describe theoretically and verify experimentally a class of diffraction-free pulsed optical beams that are ‘omni-resonant’: they are transmitted through planar Fabry- Perot resonators without spectral filtering even if their bandwidth far exceeds the cavity resonant linewidth.