Space-time focusing using a dispersive axicon

摘要

A dispersive axicon is proposed as a means of generating pulses that are localized in both space and time. The axicon's frequency-dependent dielectric constant allows the generation of Bessel beams with varying group velocities, which is exploited to compress pulses propagating in free space. The spatial localization inherent to Bessel beams combined with this temporal localization results in simultaneous space-time focusing.