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Paper Abstract and Keywords
Presentation 2025-10-24 10:55
Molecule sensor which exclusively identifies a pair of weak absorption lines from much more dilute (0.5 Torr) acetylene molecule than our previous report, using a feedback-stabilized SOA-based mode-locked laser
Akihiro Ozawa, Kento Yasui, Yosuke Konishi, Yoshiyasu Ueno (UEC) OCS2025-38 OPE2025-85 LQE2025-40
Abstract (in Japanese) (See Japanese page) 
(in English) In this study, we achieved, for the first time, highly exclusive detection signals of a pair of two extremely weak absorption lines of gaseous acetylene-molecule samples with 0.5-Torr pressure and 3-cm optical-path length. This was accomplished by applying a feedback stabilization control to our original semiconductor mode-locked laser, enabling all comb components of the generated optical frequency comb to be continuously swept in a sawtooth pattern with a frequency range of Δ5 GHz at 10 Hz.
This success was realized by identifying multiple instability factors inherent to the laser cavity structure, improving the signal-to-noise ratio of the detected signal, and thereby significantly enhancing the detection sensitivity.
Keyword (in Japanese) (See Japanese page) 
(in English) laser sensing / dilute-special-molecule gas-sensor / optical-frequency-comb spectrum / all-optical-gate / vibrationrotation states / unequal-spacing / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 212, OPE2025-85, pp. 68-73, Oct. 2025.
Paper # OPE2025-85 
Date of Issue 2025-10-16 (OCS, OPE, LQE) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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 OCS2025-38 OPE2025-85 LQE2025-40

Conference Information
Committee OCS OPE LQE  
Conference Date 2025-10-23 - 2025-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OPE 
Conference Code 2025-10-OCS-OPE-LQE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Molecule sensor which exclusively identifies a pair of weak absorption lines from much more dilute (0.5 Torr) acetylene molecule than our previous report, using a feedback-stabilized SOA-based mode-locked laser 
Sub Title (in English)  
Keyword(1) laser sensing  
Keyword(2) dilute-special-molecule gas-sensor  
Keyword(3) optical-frequency-comb spectrum  
Keyword(4) all-optical-gate  
Keyword(5) vibrationrotation states  
Keyword(6) unequal-spacing  
Keyword(7)  
Keyword(8)  
1st Author's Name Akihiro Ozawa  
1st Author's Affiliation University of Electro-Communications (UEC)
2nd Author's Name Kento Yasui  
2nd Author's Affiliation University of Electro-Communications (UEC)
3rd Author's Name Yosuke Konishi  
3rd Author's Affiliation University of Electro-Communications (UEC)
4th Author's Name Yoshiyasu Ueno  
4th Author's Affiliation University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2025-10-24 10:55:00 
Presentation Time 25 minutes 
Registration for OPE 
Paper # OCS2025-38, OPE2025-85, LQE2025-40 
Volume (vol) vol.125 
Number (no) no.211(OCS), no.212(OPE), no.213(LQE) 
Page pp.68-73 
#Pages 6 
Date of Issue 2025-10-16 (OCS, OPE, LQE) 

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