  Recently, a spatiotemporal optical vortex (STOV) with a transverse orbital
angular momentum (OAM) has been generated from coherent ultrafast pulses using
mode-locked lasers. In contrast, we demonstrate theoretically and
experimentally that a STOV can be generated from a light source with partial
temporal coherence with fluctuating temporal phase. By eliminating the need of
mode-locked laser sources, the partially coherent STOV will serve as a
convenient and cost-effective transverse OAM source.

Optics