Pulse-to-pulse alignment technique based on synthetic-wavelength interferometry of optical frequency combs for distance measurement.
A synthetic-wavelength interferometry of optical frequency combs is proposed for the pulse-to-pulse alignment in absolute distance measurement. The synthetic wavelength derived from the virtual second harmonic and the real second harmonic is used to bridge the interference intensity peak-finding method and the heterodyne interferometric phase measurement, so that the pulse-to-pulse alignment can be linked directly to single-wavelength heterodyne interferometry. The experimental results demonstrate that the distance measured by the peak-finding method with micrometer accuracy can be improved to the nanometer level by applying the method proposed.
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, China. guanhaowu@mail.tsinghua.edu.cn
Guanhao
G
Wu
Mayumi
M
Takahashi
Hajime
H
Inaba
Kaoru
K
Minoshima