Report summary

Columbia University Department of Applied Physics and Applied Mathematics in 2015-2026 reads as a 82-PI network with 113 internal PI collaborations. The dominant subject mix is Engineering as the leading field (20% of slots across 34 PIs; 34 labels), Global and Planetary Change as the leading subfield (10% of slots across 20 PIs; 20 labels), and Atmospheric and Environmental Gas Dynamics as the leading topic (5% of slots across 11 PIs; 11 labels). That is promising: collaboration is not just one large hairball, and the leading breakdown groups cover 24 PIs across distinct clusters. The leading PI names are Alexander L. Gaeta (91.2 weighted works; Advanced Fiber Laser Technologies, Photonic and Optical Devices); Michal Lipson (87.5 weighted works; Photonic and Optical Devices, Advanced Fiber Laser Technologies). The most visible ties are Michal Lipson and Alexander L. Gaeta (155 shared works, weight 74.9); Alexander L. Gaeta and Yoshitomo Okawachi (130 shared works, weight 61.6). The leading breakdown groups are group 1 with 9 PIs, 11 internal connections, weight 247.5, around Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, led by Alexander L. Gaeta, Michal Lipson, Yuan Yang.