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Sagnac interferometer for time-resolved magneto-optical measurements

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Title
Sagnac interferometer for time-resolved magneto-optical measurements
Author(s)
Hyeokjun Heo; Kim, Taeho; Yungi Jeong; Hangyeol Park; Joonho Jang
Publication Date
2022-01
Journal
Review of Scientific Instruments, v.93, no.1
Publisher
American Institute of Physics Inc.
Abstract
© 2022 Author(s).We introduce a time-resolved magneto-optical measurement technique based on a zero-area Sagnac interferometer. By replacing a continuous wave light source to a pulsed one, temporal resolution of hundreds of picoseconds is achieved. Because two lights passing through a Sagnac loop always travel the same optical path length, the interference from the phase modulation and Kerr rotation occurs in a pulse mode. For illustration of the apparatus, we present ferromagnetic resonance of a Permalloy film caused by a magnetic field pump. The instrument still possesses the favorable properties of a Sagnac interferometer, such as rejection of all the reciprocal effects, and shows 1μrad/Hz sensitivity at a 3 μW optical power in the pulse mode.
URI
https://pr.ibs.re.kr/handle/8788114/11207
DOI
10.1063/5.0073908
ISSN
0034-6748
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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