Reconfigurable all-diffractive optical filters using phase-only spatial light modulators

TL;DR

This paper presents a reconfigurable optical filter using phase-only spatial light modulators, enabling dynamic spectral control through two innovative diffractive configurations with experimental validation.

Contribution

Introduces two novel reconfigurable diffractive optical filter designs using phase-only spatial light modulators with experimental demonstration.

Findings

Good agreement between experimental results and theory

Demonstrates reconfigurability of the optical filters

Validates the effectiveness of the proposed techniques

Abstract

We demonstrate a reconfigurable optical filter implemented using a phase-only two-dimensional liquid crystal on silicon spatial light modulator. To achieve this we utilize two different approaches leading to two different configurations in the modulator. The first one, based on a spatially patterned diffractive lens permits to obtain the desired spectrum along the optical axis and, in the second one, based on a generalized spectrometer, it is found outside of the optical axis. Experimental results show good agreement with the theory and indicate the validity of this technique.