Figure 4
From: Four-dimensional light shaping: manipulating ultrafast spatiotemporal foci in space and time
(a) Top: Image of nine spatiotemporal spots in an array orthogonal to the direction of spatial chirp (x axis). Bottom: simulation of intensity profile in the time domain (x-time profile). The distance between each spot is 4 μm. (b) Left: Image of nine spatiotemporal spots in an array along the direction of spatial chirp (y axis). Right: simulation of intensity profile in the time domain (y-time profile). The distance between each spot is 4 μm. (c) Left: simulation of time-averaged two-photon intensity for line temporal focusing with nine spots, assuming the spots are separated by a distance of 3 μm. Middle: experimental two-photon image taken in the fluorescent dye sample. Right: plots of the two-photon intensities along the x and y axes. The RMS error of two-photon emission for the 30 μm uniform area along the y axis is 0.046 in normalized intensity. (d) The application of the uniform intensity temporal line to direct laser writing on the surface of glass. The focal plasma is the white region. Inset: phase pattern used to create this uniform intensity temporal line.
