Image of the Week: Solid Medium–Based SSPM Spatial self-phase modulation (SSPM) observed on an MoS2-based solid medium. The phase of the laser’s Gaussian beam is modulated to SSPM concentric rings with the help of the solid medium. —Mahalingam Babu and Pritam Shetty, formerly with IIITDM Kancheepuram, Tamil Nadu, India *Link in Bio #laser #sspm #gaussian #beam