# A high-speed, wavelength invariant, single-pixel wavefront sensor with a digital micromirror device

## TL;DR

This paper introduces a high-speed, wavelength-invariant wavefront sensor using a digital micromirror device and a single-pixel detector, enabling rapid and high-resolution wavefront measurements across visible and infrared spectra.

## Contribution

The authors present a novel wavefront sensing method that employs a DMD and single-pixel detection for fast, high-resolution measurements independent of wavelength.

## Key findings

- Achieved wavefront reconstruction at 4 kHz speed.
- Demonstrated effectiveness for both visible and infrared lasers.
- Enabled high-resolution wavefront measurement without spatial detectors.

## 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.