Distance Metrology with Integrated Mode-Locked Ring Laser

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  • Kefei Hei, Delft University of Technology
  • ,
  • Guang Shi, Hangzhou Dianzi University
  • ,
  • Andreas Hansel
  • Zhongwen Deng, Delft University of Technology
  • ,
  • Sylwester Latkowski, Eindhoven University of Technology
  • ,
  • Steven A. Van Den Berg, National Metrology Institute VSL
  • ,
  • Erwin Bente, Eindhoven University of Technology
  • ,
  • Nandini Bhattacharya, Delft University of Technology

The measurement of distance plays an integral part in many aspects of modern societies. In this paper an integrated mode-locked laser on a chip is used for distance measurement based on mode-resolved interferometry. The emission from the on-chip source with a repetition rate of 2.5 GHz and a spectral bandwidth of 3 nm is coupled into a Michelson interferometer. The interferometer output is recorded as a spectral interferogram, which is captured in a single camera image. The images are analyzed using Hilbert transform to extract the distance. The distance derived shows a deviation of 6 \mum from the reference, for a distance up to 25 mm. We also demonstrate interferometry with repetition frequency sweep which can also be used with the source. Performance is expected to be better in the near future with the rapid developments in the field of on-chip laser sources which are demonstrating larger spectral widths and coherence lengths.

Original languageEnglish
JournalIEEE Photonics Journal
Volume11
Issue6
Pages (from-to)1-10
Number of pages11
ISSN1943-0655
DOIs
Publication statusPublished - Dec 2019
Externally publishedYes

    Research areas

  • Metrology, mode-locked lasers and integrated optics

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