Development of real-time measurement system using electro-optic-modulation frequency comb

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02156
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21030:Measurement engineering-related
• Research Institution: Tokyo Denki University
• Principal Investigator: NISHIKAWA Tadashi 東京電機大学, 工学部, 教授 (20374069)
• Co-Investigator(Kenkyū-buntansha): 石澤 淳 日本電信電話株式会社NTT物性科学基礎研究所, フロンティア機能物性研究部, 主任研究員 (30393797) ; 日達 研一 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 主任研究員 (60564276)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: デュアルコム分光 / リアルタイム計測 / 光周波コム / 電気光学変調光周波数コム

Outline of Final Research Achievements

We have developed a new dual-comb real-time measurement system that can be easily handled by non-laser experts. They are based on optical fiber coupling with a single free-running continuous-wave semiconductor laser and a multi-stage electro-optic modulator, which is robust and can be used in field environment. Combined with a high-precision wavelength meter, variable wavelength laser, and Herriott cell, dual-com spectroscopy measurement over a wide wavelength range of 1510 to 1585 nm is possible. Standard sample acetylene gas absorption line was measured in 9.3 ms measurement time with an absolute accuracy of 350 MHz. We also succeeded in improving the measurement sensitivity of ammonia gas spectrum, which is a biomarker for kidney disease, from 300 ppm to 10 ppm.

Free Research Field

光周波数コム

Academic Significance and Societal Importance of the Research Achievements

レーザーの専門家でなくても手軽に扱え、ロバストでフィールド環境でも利用可能な、本デュアルコムリアルタイム計測装置の開発により、現在広く普及しているフーリエ変換赤外分光光度計では実現困難な広帯域高精度高速リアルタイム計測が可能となり、その性能を活かした、環境ガスリモートセンシング、燃焼過程モニタリング、生体反応計測、バイオマーカー計測による疾病診断、長距離超精密距離計測分野へ利用の道が拓けた。