| Presentation | 2021-08-27 Diffractive optical element with long-distance focusing range Masahiro Ueno, Sohan Kawamura, Takashi Sakamoto, Eiko Sato, Yuichi Akage, Yurina Tanaka, Souichi Oka, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In rust removal by irradiation with high-power laser light, it is desirable to make the beam spot smaller in order to increase the light power density of the light irradiating on the rust. However, when the Gaussian beam is focused by a normal convex lens, the Rayleigh length is proportional to the square of the beam radius, so increasing the optical power density and extending the depth of focus are in a trade-off relationship. During the rust removal work, it is difficult to fix the laser emitting head because the head is held by hand. Therefore, in the case of an emitted beam having a short depth of focus, it often deviates from the range of high optical power density form the rust removal target, which causes a problem that the working time becomes long. As a means to solve the problem, we create a diffraction optical element that generates a light beam that keeps the beam spot small within a desired range from a Gaussian beam. The specific specification is that the full width at half maximum is within about 400μm in the range of +/-200mm centered on the point 500mm away from the exit surface of the diffraction optical element, and it was confirmed by an experiment that the performance was as designed. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Diffraction Optical Element / Rust Removal / Depth of Focus / Hologram |
| Paper # | R2021-23,EMD2021-4,CPM2021-13,OPE2021-24,LQE2021-3 |
| Date of Issue | 2021-08-20 (R, EMD, CPM, OPE, LQE) |
| Conference Information | |
| Committee | R / LQE / OPE / CPM / EMD |
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| Conference Date | 2021/8/27(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online (Zoom) |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Tadashi Dohi(Hiroshima Univ.) / Toshitada Umezawa(NICT) / Takaaki Ishigure(Keio Univ.) / Yuichi Nakamura(Toyohashi Univ. of Tech.) / Yoshiki Kayano(Univ. of Electro-Comm.) |
| Vice Chair | Yasushi Kadota(Ricoh) / Junichi Takahara(Osaka Univ.) / Toshikazu Hashimoto(NTT) / Hideki Nakazawa(Hirosaki Univ.) |
| Secretary | Yasushi Kadota(Hiroshima Univ.) / Junichi Takahara(Kansai Univ.) / Toshikazu Hashimoto(NTT) / Hideki Nakazawa(Hamamatsu Photonics) / (Tokushima Univ.) |
| Assistant | Shinji Yokogawa(Univ. of Electro-Comm.) / Takahide Yoshikawa(Fujitsu Lab.) / Takenori Sakumura(Housei Univ.) / Shinsuke Tanaka(Fujitsu) / Nobuhiko Nishiyama(Tokyo Inst. of Tech.) / Hirokazu Kobayashi(Kochi Univ. of Tech) / Tadashi Murao(Mitsubishi Electric) / Yasuo Kimura(Tokyo Univ. of Tech.) / Fumihiko Hirose(Yamagata Univ.) / Noriko Bamba(Shinshu Univ.) / Yuichi Hayashi(ＮＡＩＳＴ) / Kazuaki Miyanaga(Fujitsu Component) |
| Paper Information | |
| Registration To | Technical Committee on Reliability / Technical Committee on Lasers and Quantum Electronics / Technical Committee on OptoElectronics / Technical Committee on Component Parts and Materials / Technical Committee on Electromechanical Devices |
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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 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 | Eiko Sato |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 5th Author's Name | Yuichi Akage |
| 5th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 6th Author's Name | Yurina Tanaka |
| 6th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 7th Author's Name | Souichi Oka |
| 7th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| Date | 2021-08-27 |
| Paper # | R2021-23,EMD2021-4,CPM2021-13,OPE2021-24,LQE2021-3 |
| Volume (vol) | vol.121 |
| Number (no) | R-158,EMD-159,CPM-160,OPE-161,LQE-162 |
| Page | pp.pp.8-13(R), pp.8-13(EMD), pp.8-13(CPM), pp.8-13(OPE), pp.8-13(LQE), |
| #Pages | 6 |
| Date of Issue | 2021-08-20 (R, EMD, CPM, OPE, LQE) |