Real-time absolute distance measurement by comb-based generation of multiple wavelengths
by Sangwon Hyun; Young-Jin Kim; Byung Jae Chun; Seung-Woo Kim
International Journal of Nanomanufacturing (IJNM), Vol. 8, No. 5/6, 2012

Abstract: We present a novel scheme of exploiting the frequency comb of a femtosecond laser as the wavelength ruler for real-time measurement of absolute distances. Four different wavelengths are simultaneously generated in parallel to perform absolute distance measurements by means of multi-wavelength interferometry at an update rate of 100 Hz. When compared to commercial laser interferometers, the proposed scheme shows a discrepancy of 32 nm on average in measuring a ∼2.3 m distance, proving to be a competitive tool for industrial applications.

Online publication date: Thu, 21-Aug-2014

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