High-Resolution Displacement Measurement using a Femtosecond Frequency Comb

被引：0
|
作者：
Cip, Ondrej [1 ]
Smid, Radek [1 ]
Cizek, Martin [1 ]
Mikel, Bretislav [1 ]
Buchta, Zdenek [1 ]
Lazar, Josef [1 ]
机构：
[1] AS CR, Inst Sci Instruments, Vvi, Brno, Czech Republic
来源：
10TH IMEKO SYMPOSIUM: LASER METROLOGY FOR PRECISION MEASUREMENT AND INSPECTION IN INDUSTRY (LMPMI) 2011 | 2011年 / 2156卷
关键词：
GENERATION; LASER;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The work introduces a high-resolution displacement measurement method in a nanometer scale using passive Fabry-Perot cavity. The optical frequency of selected resonant mode of the cavity is monitored during changes of the cavity length. It uses an optical mixing the frequency of a tunable laser with frequency teethes of a femtosecond optical synthesizer (optical frequency comb). The tunable laser diode is locked to a selected mode of the optical resonator to monitor the exact mirror distance of Fabry-Perot cavity. Then a laser diode optical frequency is mixed with the beam from the stabilized femtosecond frequency comb. Due to wide spectrum of the comb and worse signal-to-noise ratio of a beat-note signal a fiber Bragg grating is used for narrow-band selection of desired components of the femtosecond comb. The beat-note signal is processed by a fast photo detector and frequency counter. The displacement of the movable mirror of the Fabry-Perot cavity is calculated on basis of the beat-note signal. The main advantage is in linear course of the scale due to using the Fabry-Perot cavity as measuring device.
引用
收藏
页码：313 / 319
页数：7
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