A New Optical Angle Measurement Method Based on Second Harmonic Generation with a Mode-Locked Femtosecond Laser

Hiraku Matsukuma, Shuhei Madokoro, Wijayanti Dwi Astuti, Yuki Shimizu, Wei Gao

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This paper proposes a new optical angle measurement method based on second harmonic generation with a mode-locked femtosecond laser source by taking use of the unique characteristic of high peak power and high-intensity electric field of the femtosecond laser pulses. The angle is measured from the second harmonic wave intensity, which is a function of the angle between the laser beam axis and the optic axis of a nonlinear crystal attached to the target of interest. It is found that the beta barium borate (BBO) crystal is suitable as the nonlinear crystal for this purpose through theoretical simulation. As the first step of research, an experimental demonstration is also carried out in such a way that a change of the second harmonic wave intensity due to the angular displacement of BBO crystal is measured to verify the feasibility of the proposed principle of the angle measurement method.

Original languageEnglish
Pages (from-to)187-198
Number of pages12
JournalNanomanufacturing and Metrology
Volume2
Issue number4
DOIs
Publication statusPublished - 2019 Dec 1

Keywords

  • Angle measurement
  • Femtosecond laser
  • Second harmonic generation

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Materials Science (miscellaneous)

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