| Presentation | 2022-08-25 Diffractive optical element with limited long-distance focusing range Masahiro Ueno, Sohan Kawamura, Takashi Sakamoto, Masayuki Tsuda, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In the rust removal using high-power laser, it is desirable to extend the focusing the focusing range to suppress the influence of fine movement of the hand when holding the laser emitting head, Further, from the viewpoint of safety, to keep the light intensity density as low as possible outside the focusing range, it is desirable that light diffusion occurs rapidly outside the range. In order to realize such a laser beam, We created a diffractive optical element (DOE) based on the phase distribution on the optical axis of the Bessel beam. Specifically, first, the points are arranged at equal intervals within a desired focusing range on the optical axis. Next, the electric field distribution on a DOE that generates a spherical wave in which the light phase at each of the points is the same as the phase of the Bessel beam is calculated for each point. Then, the sum of all the electric field distributions is calculated. Finally, the DOE that generates the phase distribution of the electric field distribution is produced. This DOE design method is characterized in that the beam diameter design and the beam diameter holding length design cab be made independently, The DOE fabricated by the design method maintains a peak power density of 30% or more of the maximum density and a beam diameter of about 130μm between 0.1m and 1m. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Diffraction Optical Element / Rust Removal / Depth of Focus / Hologram |
| Paper # | R2022-16,EMD2022-4,CPM2022-21,OPE2022-47,LQE2022-10 |
| Date of Issue | 2022-08-18 (R, EMD, CPM, OPE, LQE) |
| Conference Information | |
| Committee | EMD / R / LQE / OPE / CPM |
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| Conference Date | 2022/8/25(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Takahiro Ueno(Nippon Inst. of Tech.) / Tadashi Dohi(Hiroshima Univ.) / Junichi Takahara(Osaka Univ.) / Toshikazu Hashimoto(NTT) / Yuichi Nakamura(Toyohashi Univ. of Tech.) |
| Vice Chair | / Yasushi Kadota(Ricoh) / Kosuke Nishimura(KDDI Research) / Taro Arakawa(Yokohama National Univ.) / Hideki Nakazawa(Hirosaki Univ.) |
| Secretary | (ＮＡＩＳＴ) / Yasushi Kadota(Fujitsu Component) / Kosuke Nishimura(Hiroshima Univ.) / Taro Arakawa(Kansai Univ.) / Hideki Nakazawa(Fujitsu) |
| Assistant | Yoshiki Kayano(Univ. of Electro-Comm.) / Shinji Yokogawa(Univ. of Electro-Comm.) / Takahide Yoshikawa(Fujitsu Lab.) / Takenori Sakumura(Housei Univ.) / Yoshiaki Nishijima(Yokohama National Univ.) / Nobuhiko Nishiyama(Tokyo Inst. of Tech.) / Yuhei Ishizaka(Kanto Gakuin Univ.) / Takeshi Umeki(NTT) / Yasuo Kimura(Tokyo Univ. of Tech.) / Fumihiko Hirose(Yamagata Univ.) / Noriko Bamba(Shinshu Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Electromechanical Devices / Technical Committee on Reliability / Technical Committee on Lasers and Quantum Electronics / Technical Committee on OptoElectronics / Technical Committee on Component Parts and Materials |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Diffractive optical element with limited long-distance focusing range |
| Sub Title (in English) | |
| Keyword(1) | Diffraction Optical Element |
| Keyword(2) | Rust Removal |
| Keyword(3) | Depth of Focus |
| Keyword(4) | Hologram |
| 1st Author's Name | Masahiro Ueno |
| 1st Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 2nd Author's Name | Sohan Kawamura |
| 2nd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 3rd Author's Name | Takashi Sakamoto |
| 3rd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 4th Author's Name | Masayuki Tsuda |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| Date | 2022-08-25 |
| Paper # | R2022-16,EMD2022-4,CPM2022-21,OPE2022-47,LQE2022-10 |
| Volume (vol) | vol.122 |
| Number (no) | R-156,EMD-157,CPM-158,OPE-159,LQE-160 |
| Page | pp.pp.1-6(R), pp.1-6(EMD), pp.1-6(CPM), pp.1-6(OPE), pp.1-6(LQE), |
| #Pages | 6 |
| Date of Issue | 2022-08-18 (R, EMD, CPM, OPE, LQE) |