Fig. 4: Schematic of the experimental setup for characterizing the STOV.
From: Observation of spatiotemporal optical vortices enabled by symmetry-breaking slanted nanograting
A femtosecond laser pulse with a duration time of ≈80 fs centered at a wavelength of 800 nm is sent into the measurement system (labeled as “Laser”). The signal beam (labeled as “Sig.”) transmits through the slanted nanograting to generate STOV. The reference beam (labeled as “Ref.”) is delayed by a tunable time of τ with respect to the signal beam to perform interference. The interference fringes are recorded by a CCD camera. To make the drawing clearer, some mirrors for zero delay are omitted. LP linear polarizer, BS beam splitter, M mirror, Obj objective.
