Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser

Yoon-Soo Jang; Keunwoo Lee; Seongheum Han; Joohyung Lee; Young-Jin Kim; Seung-Woo Kim

doi:10.1117/1.OE.53.12.122403

8 May 2014 Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser

Yoon-Soo Jang, Keunwoo Lee, Seongheum Han, Joohyung Lee, Young-Jin Kim, Seung-Woo Kim

Author Affiliations +

Optical Engineering, Vol. 53, Issue 12, 122403 (May 2014). https://doi.org/10.1117/1.OE.53.12.122403

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.

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Yoon-Soo Jang, Keunwoo Lee, Seongheum Han, Joohyung Lee, Young-Jin Kim, and Seung-Woo Kim "Absolute distance measurement with extension of nonambiguity range using the frequency comb of a femtosecond laser," Optical Engineering 53(12), 122403 (8 May 2014). https://doi.org/10.1117/1.OE.53.12.122403

Published: 8 May 2014

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