An optical angle sensor based on second harmonic generation of a modelocked laser

Hiraku Matsukuma, Shuhei Madokoro, Masaru Nakao, Yuki Shimizu, Wei Gao

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1 Citation (Scopus)


This paper presents an optical angle sensor using characteristics of second harmonic generation (SHG) which is a nonlinear process of electromagnetic field. In a SHG process, the fundamental wave is made incidence into a non-linear optical crystal. The second harmonic wave which has double frequency of the fundamental wave is then generated. The light intensity of the generated second harmonic wave changes with the incident angle of the fundamental wave to the non-linear optical crystal due to phase mismatch which is a factor of determining the conversion efficiency of SHG. The dependence of second harmonic generation on angular displacement is calculated theoretically for mode-locked femto second laser light source. Experiment is also carried out in order to demonstrate the theoretical calculation.

Original languageEnglish
Article numberOPTM-5-02
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2019
EventOptical Technology and Measurement for Industrial Applications Conference 2019 - Yokohama, Japan
Duration: 2019 Apr 222019 Apr 26


  • Angle sensor
  • Femto-second laser
  • Mode-locked laser
  • Non-linear process
  • Second harmonic generation


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