Two-Frequency Paired Polarization Interferometer for Faraday Rotation Angle Detection

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28171

Title:	Two-Frequency Paired Polarization Interferometer for Faraday Rotation Angle Detection
Authors:	Lin,CE;Chang,JG;Chou,LD;Yu,CJ;Lee,CC;Chou,CE
Contributors:	光電科學研究所
Keywords:	CAVITY RING;GAS-PHASE
Date:	2009
Issue Date:	2010-06-29 19:42:55 (UTC+8)
Publisher:	中央大學
Abstract:	A highly sensitive two-frequency paired linear polarized interferometer (TPPI) for measuring the Faraday rotation angle and Verdet constant of the Bi12SiO20 (BSO) crystal in real time was set up by an amplitude-sensitive detection method. TPPI features a common-path heterodyne interferometer in conjunction with a highly correlated paired linear polarized laser beam. Then, the antisymmetry of polarized heterodyne signals is produced and Faraday rotation angle detection by a balanced detector scheme is satisfied automatically. As a result, shot-noise-limited detection of Faraday rotation angle is possible. In addition, the Faraday rotation angle detection is also insensitive to the scattering and absorption caused by the specimen because of the common-path propagation of the paired linear polarized laser beam. Experimentally, the sensitivities of Faraday rotation angle and Verdet constant measurements of the BSO crystal under the arrangement with a single pass of the laser beam in TPPI are 4.93 x 10(-5) rad/mm and 2.6 x 10(-7) rad/(mT.mm), respectively. This suggests that the Faraday rotation angle detection sensitivity has the potential to be on the order of 10(-8) rad/mm if a Fabry-Perot cavity with a finesse of F = 120 is used in TPPI. (C) 2009 The Japan Society of Applied Physics
Relation:	JAPANESE JOURNAL OF APPLIED PHYSICS
Appears in Collections:	[Graduate Institute of Optics and Photonics] journal & Dissertation

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