A High-Speed, Wavelength Invariant, Single-Pixel Wavefront Sensor With a Digital Micromirror Device

Abstract

The wavefront measurement of a light beam is a complex task, which often requires a series of spatially resolved intensity measurements. For instance, a detector array may be used to measure the local phase gradient in the transverse plane of the unknown laser beam. In most cases the resolution of the reconstructed wavefront is determined by the resolution of the detector, which in the infrared case is severely limited. Here we employ a Digital Micro-mirror Device (DMD) and a single-pixel detector (i.e. with no spatial resolution) to demonstrate the reconstruction of unknown wavefronts with excellent resolution. Our approach exploits modal decomposition of the incoming field by the DMD, enabling wavefront measurements at 4 kHz of both visible and infrared laser beams.

Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device

“…Additionally, using slightly better centroiding methods [ 17 ] could improve accuracy. The use of a high-speed CMOS camera could potentially allow for higher speed, but ultimately a different methodology, such as single-pixel sensing, may be required to gain the upmost in terms of kHz speed [ 24 ].…”

Theory and Practice of Orbital Angular Momentum and Beyond

“…The technique used to characterize a beam by its modal components using CGHs is known as modal decomposition and is thoroughly explained in [23]. Interestingly, it is possible to use modal decomposition to reconstruct a beam's wavefront from its OAM and other modal components in a high-speed manner using a DMD [24].…”

“…High resolution digital micro-mirror devices are becoming popular as they can also be used as digital holograms, albeit with lower light efficiency, but for arbitrary polarization [100]. Another benefit of DMDs is their high speed compared to liquid crystal spatial light modulators [19], [24], [101].…”

Divergence-degenerated spatial multiplexing towards ultrahigh capacity, low bit-error-rate optical communications

“…Despite of the widely applied sorting approaches developed for OAM beams and LG beams, such as Dammann vortex grating [23,48,49], Gouy phase radial mode sorter [50], logpolar based azimuthal mode sorters [51,52], interference and diffraction method [53][54][55], and deep learning [56], identification and sorting of ray-wave geometric beams such as MVGBs is still at its infancy, due to the intrinsic complex structure and rich controlling parameters. Inspired by the recent work of digital cavity-free tailoring [44], here we demonstrate the sorting and demultiplexing of superposed MVGBs in the following experiments, using the demultiplexed conjugated holographic masks that are designed by diffracting each beam component into different location [57,58], as detailed in the Methods section.…”