Compensating the delayed electro-optical deflector response

TL;DR

This paper presents a bi-exponential filtering method to compensate for creep in electro-optic deflectors, enabling precise beam deflection control across a wide frequency range.

Contribution

It introduces a novel bi-exponential filter technique to mitigate relaxation-induced creep in electro-optic deflectors made of AD*P.

Findings

Residual settling error less than 0.001 of deflection

Effective compensation over the entire driver frequency range

Enhanced accuracy in high-frequency electro-optic beam steering

Abstract

Due to its immediate response, the electro-optic effect is exploited for high-frequency phase and power modulation and for beam deflection. Besides the immediate response, electro-optic materials exhibit creep due to relaxation processes in the material, which results in a gradual settling of the response when a voltage is applied for tens of milliseconds. A bi-exponential filter can compensate this behavior, reported here for electro-optic deflectors made of AD*P, such that these deflectors can be used over the entire frequency range of the driver with a residual settling error <0.001 of the deflection.