An optical frequency domain angle measurement method based on second harmonic generation

Wijayanti Dwi Astuti, Hiraku Matsukuma, Masaru Nakao, Kuangyi Li, Yuki Shimizu, Wei Gao

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

Original languageEnglish
Article number670
Pages (from-to)1-14
Number of pages14
JournalSensors (Switzerland)
Issue number2
Publication statusPublished - 2021 Jan 2


  • Angle measurement
  • Frequency-domain angle measurement
  • Mode-locked laser
  • Parabolic mirror
  • Second harmonic generation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Information Systems
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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