Design of adaptive optics by interference fitting: theoretical background

TL;DR

This paper develops a theoretical framework for designing adaptive optical lenses using interference fitting, providing a new curvature prediction method validated against finite element analysis and experiments.

Contribution

It introduces a novel theoretical formulation for predicting curvature in interference-fitted adaptive lenses, advancing beyond numerical methods.

Findings

New curvature prediction formula proposed

Validation against finite element simulations

Experimental measurements support the theory

Abstract

Interference-fit joints are typically adopted to produce permanent assemblies among mechanical parts. The resulting contact pressure is generally used for element fixing or to allow load transmission. Nevertheless, some special designs take advantage of the contact pressure to induce desiderata deformation or to mitigate the stress field inside the structure. Biased interference fitting between a planar mirror and an external ring could be used to induce the required curvature to realize new adaptive lens for optical aberration correction. Recently, thermally-actuated deformable mirror on this principle based, was proposed and prototyped. Although the feasibility and utility of such innovative lens was demonstrated, no comprehensive theory was developed to describe mirror behaviour and predict their curvature. Nowadays, the use of approximated numerical approach, such as the finite element method, is the only way to study the interaction between biased and interference fitted bodies. The paper aims to give the theoretical background for the correct design of adaptive lens actuated by interference fitting. A new formulation for the curvature prediction is proposed and compared with finite element analysis and available experimental measurements.