Nonlinear interferometry-based metrology of magneto-optical properties at infrared wavelengths

TL;DR

This paper introduces a nonlinear interferometry method for measuring magneto-optical properties of materials at infrared wavelengths using visible-range detection, simplifying the process and expanding application potential.

Contribution

It presents a novel nonlinear interferometry technique for infrared magneto-optical metrology, enabling easier and more accessible measurements compared to traditional methods.

Findings

Successfully measured Verdet constant of bismuth-iron-garnet

Achieved spectral bandwidth of 600 nm in near-IR range

Demonstrated feasibility of infrared magneto-optical measurements via visible detection

Abstract

Magneto-optical properties of materials are utilized in numerous applications both in scientific research and industries. The novel properties of these materials can be further investigated by performing metrology in the infrared wavelength range, thereby enriching their potential applications. However, current infrared metrology techniques can be challenging and resource-intensive due to the unavailability of suitable components. To address these challenges, we propose and demonstrate a set of measurements based on nonlinear interferometry, which allows us investigating magneto-optical properties of materials at infrared wavelength range by performing optical detection at the visible range. For a proof-of-principle study, we measure the Verdet constant of a bismuth-iron-garnet, over a spectral bandwidth of 600 nm in the near-IR range.