On the Cover: Spectrum shuttle for producing spatially shapable GHz burst pulses

The image on the cover illustrates the “spectrum shuttle” which is a groundbreaking method for generating pulse trains with subnanosecond to nanosecond intervals and individually shapable spatial pro?les. This method enables unprecedented spatiotemporal shaping of ultrashort pulses in free space, o?ering ?exible manipulation of each spectral component.

On the Cover: Coherently tiled Ti:sapphire laser amplification: a way to break the 10 petawatt limit on current ultraintense lasers

The image on the cover illustrates a tiled-titanium:sapphire chirped pulse ampli?cation. It can expand titanium:sapphire sizes, truncate transverse ampli?ed spontaneous emission, and suppress parasitic lasing. Importantly, it does not require complex space-time tiling control.

On the Cover: Metasurface-based computational imaging: a review

The image shows a schematic of a system utilizing metasurface-based optical modulation and computation. It modulates high-dimensional optical signals, encoding target information for tailored imaging tasks. Combined with co-optimized computational reconstruction, this approach ensures the high-quality recovery of diverse data types—hyperspectra, full-Stokes polarization, wavefront phase, or depth—depending on the speci?c imaging challenge.

On the Cover: Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces

This research demonstrates that, by properly tuning the equilibrium optical response of a nonlocal metasurface, it is possible to achieve sizable variation of the photoinduced out-of-equilibrium optical response on the picosecond timescale employing ?uences an order of magnitude lower than previous studies with comparable re?ectivity variations in silicon platforms. The image on the cover illustrates a schematic of a silicon nonlocal high-contrast grating illuminated by a probe beam whose re?ection is modulated by a higher frequency pump beam.