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Optical Engineering

Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser
Author(s): Yoon-Soo Jang; Keunwoo Lee; Seongheum Han; Joohyung Lee; Young-Jin Kim; Seung-Woo Kim
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Paper Abstract

We revisit the method of synthetic wavelength interferometry (SWI) for absolute measurement of long distances using the radio-frequency harmonics of the pulse repetition rate of a mode-locked femtosecond laser. Our intention here is to extend the nonambiguity range (NAR) of the SWI method using a coarse virtual wavelength synthesized by shifting the pulse repetition rate. The proposed concept of NAR extension is experimentally verified by measuring a ∼13-m distance with repeatability of 9.5 μm (root-mean-square). The measurement precision is estimated to be 31.2 μm in comparison with an incremental He–Ne laser interferometer. This extended SWI method is found to be well suited for long-distance measurements demanded in the fields of large-scale precision engineering, geodetic survey, and future space missions.

Paper Details

Date Published: 8 May 2014
PDF: 6 pages
Opt. Eng. 53(12) 122403 doi: 10.1117/1.OE.53.12.122403
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Yoon-Soo Jang, KAIST (Korea, Republic of)
Keunwoo Lee, KAIST (Korea, Republic of)
Seongheum Han, KAIST (Korea, Republic of)
Joohyung Lee, KAIST (Korea, Republic of)
Korea Research Institute of Standards and Science (Korea, Republic of)
Young-Jin Kim, KAIST (Korea, Republic of)
Seung-Woo Kim, KAIST (Korea, Republic of)

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