Multifunctional reflection-type magneto-optic spectrum measuring system

Abstract

The invention discloses a multifunctional reflection-type magneto-optic spectrum measuring system which uses a super-continuous white light source, a grating monochromator, a plurality of polarized lenses, a photoelastic modulator, a broad band 1 / 4 and 1 / 2 wave plate, a non-polarization beam splitter (NPBS), a single-ended differential detector and an OXFORD low-temperature superconducting magnet system to form a spectrum detection system with a flexible and variable structure. The invention can realize the measurement of reflection-type magnetic circular dichroism (MCD), polar magneto-optical Kerr effect, polarized reflection spectrum and magnetic wire magnetic linear dichroism (MLD) on the same light path. The system has high sensitivity and can be used for fields, such as basic physics research, material characteristic analysis, light polarization modulation communication and the like.

Description

technical field [0001] The invention relates to the technical field of magneto-optical spectrum detection, in particular to a multifunctional reflective magneto-optic spectrum detection system. Background technique [0002] Because many substances have Faraday effect and Kerr effect, the magneto-optic spectroscopy detection system has a wide range of applications: such as observing the optical properties of molecules in biology, the energy band research of semiconductor / metal materials, and the polarization modulation research in optical communication. Compared with the transmission measurement system, the reflective magneto-optical spectroscopy measurement system can measure opaque samples, and the configuration structure is flexible, so it is applicable to a wider range of occasions. [0003] The full name of MCD is magnetic circular dichroism, that is, under a magnetic field, the absorption rate of matter for left-handed circularly polarized light and right-handed circula...

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Problems solved by technology

[0005] Generally, the magneto-optical spectroscopy measurement system is divided into transmission type and reflection type. The transmission type magneto-optic spectroscopy measurement system needs to have four (or two symmetrical openings) low-temperature superconducting Dewars, which are expensive and cannot measure opaque samples. magneto-optical spectrum

At the same time, most reflective magneto-optical spectroscopy measurement systems are based on electromagnets and helium cycle refrigerators. The measurement purpose is relatively single, the configuration scheme is not flexible, the signal-to-noise ratio is poor, and the temperature and magnetic field cannot be changed at the same time.

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