TY - JOUR
T1 - A New Optical Angle Measurement Method Based on Second Harmonic Generation with a Mode-Locked Femtosecond Laser
AU - Matsukuma, Hiraku
AU - Madokoro, Shuhei
AU - Astuti, Wijayanti Dwi
AU - Shimizu, Yuki
AU - Gao, Wei
N1 - Funding Information:
Grants-in-Aid for Scientific Research (KAKENHI), Japan Society for the Promotion of Science (JSPS).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
KW - Angle measurement
KW - Femtosecond laser
KW - Second harmonic generation
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U2 - 10.1007/s41871-019-00052-4
DO - 10.1007/s41871-019-00052-4
M3 - Article
AN - SCOPUS:85079344053
VL - 2
SP - 187
EP - 198
JO - Nanomanufacturing and Metrology
JF - Nanomanufacturing and Metrology
SN - 2520-811X
IS - 4
ER -