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Paper Abstract and Keywords
Presentation 2021-08-27 11:30
Diffractive optical element with long-distance focusing range
Masahiro Ueno, Sohan Kawamura, Takashi Sakamoto, Eiko Sato, Yuichi Akage, Yurina Tanaka, Souichi Oka (NTT) R2021-23 EMD2021-4 CPM2021-13 OPE2021-24 LQE2021-3
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) Diffraction Optical Element / Rust Removal / Depth of Focus / Hologram / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 160, CPM2021-13, pp. 8-13, Aug. 2021.
Paper # CPM2021-13 
Date of Issue 2021-08-20 (R, EMD, CPM, OPE, LQE) 
ISSN Online edition: ISSN 2432-6380
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Download PDF R2021-23 EMD2021-4 CPM2021-13 OPE2021-24 LQE2021-3

Conference Information
Committee R LQE OPE CPM EMD  
Conference Date 2021-08-27 - 2021-08-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online (Zoom) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CPM 
Conference Code 2021-08-R-LQE-OPE-CPM-EMD 
Language Japanese 
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  
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Keyword(6)  
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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)
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Speaker Author-1 
Date Time 2021-08-27 11:30:00 
Presentation Time 30 minutes 
Registration for CPM 
Paper # R2021-23, EMD2021-4, CPM2021-13, OPE2021-24, LQE2021-3 
Volume (vol) vol.121 
Number (no) no.158(R), no.159(EMD), no.160(CPM), no.161(OPE), no.162(LQE) 
Page pp.8-13 
#Pages
Date of Issue 2021-08-20 (R, EMD, CPM, OPE, LQE) 


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