Dynamical behaviour of birefringent Fabry-Perot cavities

TL;DR

This paper investigates the dynamic response of birefringent Fabry-Perot cavities, revealing they behave as second-order low pass filters rather than the traditionally assumed first-order, supported by both theoretical and experimental analysis.

Contribution

It provides a new theoretical model and experimental validation showing birefringent cavities act as second-order filters, challenging previous assumptions.

Findings

Birefringent cavities behave as second-order low pass filters.

Experimental data contradicts the first-order filter hypothesis.

Theoretical expression for the equivalent cavity filter is derived.

Abstract

In this paper we present a theoretical and experimental study of the dynamical behaviour of birefringent cavities. Our experimental data show that usual hypothesis which provides that a Fabry-Perot cavity is a first-order low pass filter cannot explain the behaviour of a birefringent cavity. We explain this phenomenon, and give the theoretical expression of the equivalent cavity filter which corresponds to a second-order low pass filter.