Real-time absolute distance measurement by comb-based generation of multiple wavelengths. (1st January 2012)

• Record Type: Journal Article
• Authors: Hyun, Sangwon; Kim, Young-Jin; Chun, Byung Jae; Kim, Seung-Woo
• Is Part Of: International journal of nanomanufacturing. Volume 8:Number 5/6(2012)
• Page Start: 432
• Page End: 440
• Publication Date: 2012-01-01
• Subjects: absolute distance -- optical frequency generation -- frequency comb -- femtosecond laser -- multi-wavelength interferometer -- optical standards; Nanostructured materials industry -- Periodicals; Nanotechnology -- Periodicals; 620.505
• Languages: English
• ISSNs: 1746-9392

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.