Accelerating complex wavefront shaping with line-scanning holography using digital micromirror devices

Digital micromirror devices (DMDs) allow for complex wavefront shaping with their unique advantage of modulation speeds reaching up to a few tens of kilohertz. Here, we have developed a method called the fast line-scanning amplitude-encoded scattering-assisted holography (FLASH) technique to further increase the speed of complex wavefront shaping by three orders of magnitude using a DMD. By converting spatial degrees of freedom into temporal degrees of freedom, the FLASH technique achieves three-dimensional control of micron-sized foci at a speed of 30 MHz, though at the cost of focal contrast. Potential applications include 3D laser-scanning microscopy, laser micromachining, and high-speed beam scanning.