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Paper Abstract and Keywords
Presentation 2026-02-20 11:20
Fabrication of Microstructures in Fluoride Fibers by Femtosecond-Laser Internal Processing and Their Sensorization
Koki Tachibana, Gakuto Ishida, Tomoya Ikeda (Akita Prefectural Univ.), Hiyori Uehara (NIFS), Shigeki Tokita (ICR, Kyoto Univ.), Yoshiaki Nishijima (Yokohama National Univ.), Kenji Goya (Akita Prefectural Univ.) OFT2025-95 OPE2025-114
Abstract (in Japanese) (See Japanese page) 
(in English) Femtosecond laser processing was employed to fabricate refractive-index-modified regions within a fluoride optical fiber. These modified regions functioned as mode couplers, enabling interaction between the guided light and immersion oil applied to the outer surface of the fiber, thereby inducing optical absorption. Differential loss spectra (dB) in the mid-infrared region were measured, from which absorption peaks associated with C–H stretching vibrations were clearly identified. This result demonstrates the feasibility of chemical component discrimination using the proposed method. Notably, the approach does not require any opening of the fiber cladding, while maintaining high mechanical strength and enhanced resistance to devitrification. These advantages confirm the effectiveness and practicality of the proposed technique for mid-infrared fiber-optic sensing.
Keyword (in Japanese) (See Japanese page) 
(in English) fluoride optical fiber / femtosecond laser / mid-infrared sensing / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 361, OFT2025-95, pp. 48-53, Feb. 2026.
Paper # OFT2025-95 
Date of Issue 2026-02-12 (OFT, OPE) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF OFT2025-95 OPE2025-114

Conference Information
Committee OCS OFT OPE  
Conference Date 2026-02-19 - 2026-02-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Minna-No-Kashikaigishitsu Naha-Asahimachi-Ten 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OFT 
Conference Code 2026-02-OCS-OFT-OPE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fabrication of Microstructures in Fluoride Fibers by Femtosecond-Laser Internal Processing and Their Sensorization 
Sub Title (in English)  
Keyword(1) fluoride optical fiber  
Keyword(2) femtosecond laser  
Keyword(3) mid-infrared sensing  
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1st Author's Name Koki Tachibana  
1st Author's Affiliation Akita Prefectural University (Akita Prefectural Univ.)
2nd Author's Name Gakuto Ishida  
2nd Author's Affiliation Akita Prefectural University (Akita Prefectural Univ.)
3rd Author's Name Tomoya Ikeda  
3rd Author's Affiliation Akita Prefectural University (Akita Prefectural Univ.)
4th Author's Name Hiyori Uehara  
4th Author's Affiliation National Institute for Fusion Science (NIFS)
5th Author's Name Shigeki Tokita  
5th Author's Affiliation Institute for Chemical Research, Kyoto University (ICR, Kyoto Univ.)
6th Author's Name Yoshiaki Nishijima  
6th Author's Affiliation Yokohama National University (Yokohama National Univ.)
7th Author's Name Kenji Goya  
7th Author's Affiliation Akita Prefectural University (Akita Prefectural Univ.)
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Speaker Author-1 
Date Time 2026-02-20 11:20:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2025-95, OPE2025-114 
Volume (vol) vol.125 
Number (no) no.361(OFT), no.362(OPE) 
Page pp.48-53(OFT), pp.72-77(OPE) 
#Pages 6 
Date of Issue 2026-02-12 (OFT, OPE) 

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