Miniaturized and robust tunable monochromatic magneto-optical platform for pulsed magnetic fields

TL;DR

This paper introduces a compact, cost-effective tunable monochromatic magneto-optical system that performs accurately in pulsed magnetic fields, offering a practical alternative to bulky laser setups for magneto-optical research.

Contribution

The authors develop a miniaturized, stable, and affordable magneto-optical platform using a white light source and monochromator, enabling high-precision measurements in pulsed magnetic fields.

Findings

Achieved high-accuracy Faraday rotation measurements on CdCr2O4.

Performed magneto-transmission experiments on SrCu2(BO3)2 with results matching previous studies.

Demonstrated the system's effectiveness in millisecond-range pulsed magnetic fields.

Abstract

Tunable monochromatic magneto-transmission is one of the most established magneto-optical techniques, particularly well suited for pulsed magnetic fields. It employs fixed-wavelength monochromatic light as the probe, while the magnetic field is swept to bring the sample into resonance with the photon energy. The key component of this setup is a tunable laser system, typically consisting of a Ti:sapphire laser coupled with an optical parametric oscillator. However, such laser systems are often bulky, expensive, and inherently unstable, which significantly limits their widespread application in magneto-optical laboratories. In this work, we develop a high-accuracy, cost-effective, and compact tunable monochromatic magneto-transmission system based on a combination of a laser-driven white light source and a mini monochromator, and demonstrate its feasibility and performance in a millisecond-range pulsed magnetic field condition. To verify the accuracy of this new and simplified setup, we performed Faraday rotation measurements on the geometrically frustrated spin system CdCr2O4, as well as magneto-transmission experiments on the Shastry-Sutherland lattice antiferromagnet SrCu2(BO3)2. These results show excellent agreement with previous reports, confirming the reliability and precision of the new setup.