# Experimental evidence of laser power oscillations induced by the relative Fresnel (Goos-Haenchen) phase

## TL;DR

This paper experimentally demonstrates laser power oscillations caused by the relative Fresnel (Goos-Haenchen) phase, confirming theoretical predictions and introducing a novel two-phase ellipsometric system based on this phase.

## Contribution

It provides the first experimental evidence of power oscillations induced by the relative Fresnel phase and proposes a new optical system utilizing this phase for phase measurement.

## Key findings

- Confirmed theoretical predictions of power oscillations
- Demonstrated control of laser power via Fresnel phase amplification
- Introduced a new ellipsometric system based on the Goos-Haenchen phase

## Abstract

The amplification of the relative Fresnel (Goos-Haenchen) phase by an appropriate number of total internal reflections and the choice of favorable incidence angles allow to observe full oscillations in the power of a DPSS laser transmitted through sequential BK7 blocks. The experimental results confirm the theoretical predictions. The optical apparatus used in this letter can be seen as a new type of two-phase ellipsometric system where the phase of the complex refractive index is replaced by the relative Fresnel (Goos-Haenchen) phase.