Zero-order-free complex beam shaping

TL;DR

This paper introduces a novel method for zero-order diffraction-free complex beam shaping using an asymmetric triangle reflector, digital blazed grating, and digital lens integrated into phase holograms on spatial light modulators.

Contribution

It presents a new approach combining digital lens and asymmetric reflector design to eliminate zero-order diffraction in complex beam shaping.

Findings

Successful generation of zero-order free complex beams.

Validation through comparative analysis of complex light fields.

Enhanced beam shaping accuracy without zero-order diffraction artifacts.

Abstract

The unwanted zero-order diffraction is still an issue in beam shaping using pixelated spatial light modulators. In this paper, we report a new approach for zero-order free beam shaping by designing an asymmetric triangle reflector and introducing a digital blazed grating and a digital lens to the phase hologram addressed onto the spatial light modulator. By adding the digital lens phase to the previously reported complex-amplitude coding algorithms, we realized the generation of complex beams without the burden of zero-order diffraction. We comparatively investigated the produced complex light fields using the modified complex-amplitude coding algorithms to validate the proposed method.