Validation of separated source frequency delivery for a fiber-coupled heterodyne displacement interferometer

被引：8
作者：
Meskers, Arjan J. H. [1 ]
Spronck, Jo W. [1 ]
Schmidt, Robert H. Munnig [1 ]
机构：
[1] Delft Univ Technol, Dept Precis & Microsyst Engn, NL-2628 CD Delft, Netherlands
来源：
OPTICS LETTERS | 2014年 / 39卷 / 15期
关键词：
PERIODIC NONLINEARITY; LASER INTERFEROMETER; MICHELSON INTERFEROMETRY; ERROR; UNCERTAINTY;
D O I：
10.1364/OL.39.004603
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The use of optical fibers presents several advantages with respect to free-space optical transport regarding source-frequency delivery to individual heterodyne interferometers. Unfortunately, fiber delivery to individual coaxial heterodyne interferometers leads to an increase of (periodic) nonlinearity in the measurement, because transporting coaxial frequencies through one optical fiber leads to frequency mixing. Coaxial beams thus require delivery via free-space transportation methods. In contrast, the heterodyne interferometer concept discussed in this Letter is based on separated source frequencies, which allow for fiber delivery without additional nonlinearity. This investigation analyzes the influence of external disturbances acting on the two fibers during delivery, causing asymmetry in phase between the two fibers (first-order effect), and irradiance fluctuations (second-order effect). Experiments using electro-optic phase modulation and acousto-optic irradiance modulation confirmed that the interferometer-concept can measure with sub-nanometer uncertainty using fiber delivered source frequencies, enabling fully fiber-coupled heterodyne displacement interferometers. (C) 2014 Optical Society of America
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页码：4603 / 4606
页数：4
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