https://www.laserfocusworld.com/optics/article/14210916/off-axis-parabolic-mirrors-have-use-in-petawatt-laser-beamlines
Off-axis parabolic mirrors have use in petawatt laser beamlines | Laser Focus World
Off-axis parabolic mirrors are used to maximize power density at the focus of petawatt laser beamlines.
parabolic mirrors