Development of Coherent Spectroscopic Methods using Dual-Comb

2018 Fiscal Year Final Research Report

• Project/Area Number: 17K14322
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: The University of Electro-Communications
• Principal Investigator: Asahara Akifumi 電気通信大学, 大学院情報理工学研究科, 助教 (00770091)
• Research Collaborator: Minoshima Kaoru
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: 光コム / デュアルコム分光 / 超高速分光 / コヒーレント分光 / 光波制御

Outline of Final Research Achievements

The purpose of this study was to develop a technology of coherent spectroscopy using dual- comb light source, two phase-synchronized optical combs. By actively using the high coherent controllability that is the feature of the optical comb, we found new application possibilities.
In the first year (H29), we examined control methods for coherent control of dual-comb light sources. We found that various modulation methods can be realized by precisely controlling two frequencies of combs, offset frequency, fceo, and repetition frequency, frep. In the final year (H30), our research was conducted focusing on the potential as polarization control technology. Birefringent material was applied as a measurement sample, and we succeeded in acquiring spectral data coherently modulated by the optical comb.

Free Research Field

光計測

Academic Significance and Societal Importance of the Research Achievements

光コム分光は，これまで精密分子分光や距離測定などの限られた応用が主な研究対象であったが，本研究成果によって，精密な周波数基準という従来の光コムの捉え方を大きく越えた，新たなコヒーレント光波制御技術としての応用可能性が提示された．特に「オフセット周波数差の積極的活用によるデュアルコムパルスの相対CEP操作」という考え方は，光コム光源の将来的な幅広い発展性を示す重要な知見の獲得である．