Two-photon Shack-Hartmann wavefront sensor

Opt Lett. 2017 Mar 15;42(6):1141-1144. doi: 10.1364/OL.42.001141.

Abstract

We introduce a simple wavefront sensing scheme for aberration measurement of pulsed laser beams in near-infrared wavelengths (<2200 nm), where detectors are not always available or are very expensive. The method is based on two-photon absorption in a silicon detector array for longer wavelengths detection. We demonstrate the simplicity of such implementations with a commercially available Shack-Hartmann wavefront sensor and discuss the detection sensitivity of this method.