Development of a molecularly-modulated continuous-wave Raman comb

• Project/Area Number: 18K04982
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Kyushu University
• Principal Investigator: Zaitsu Shin-ichi 九州大学, 工学研究院, 准教授 (60423521)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: ラマン効果 / 光共振器増強 / 非線形光学 / 光変調 / 四光波混合 / 光変調器 / 誘導ラマン散乱 / 超高繰り返しレーザー / レーザー

Outline of Final Research Achievements

A continuous-wave (cw) Raman comb that provides an equally-separated narrow-line frequency components at a frequency of larger than 10 THz was demonstrated. It is based on a "continuous-wave molecular-optic modulator" that is a newly-developed method to control a lightwave. In order to characterize the cw Raman comb, a method to measure a phase-relationship between comb lines by combining an interferometric autocorrelator and optical heterodyne detector was developed. This allows us to quantify a phase difference of the cw Raman comb modulated at a frequency of 17.6 THz.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した「連続発振ラマンコム」の位相測定方法は、（1）位相と振幅を制御した複数のラマンコムの合成によって得られる光シンセサイザー、（2）10THzを超える繰り返し周波数で発振する画期的な分子変調モード同期レーザー、（3）極限的な周波数の精度で発生する単一周波数テラヘルツ波光源、（4）原子・分子の準位間の複数の遷移に同時にアクセスできる位相同期レーザーなどの新しい展開への貢献が期待される。また、これらの光源は、超高速光通信、精密原子/分子分光、高精度光計測・センシングなど、社会の発展に寄与する応用が期待できる。

Research Products

• [Journal Article] A Molecularly Modulated Mode-Locked Laser (2018)
  • Author(s): Shin-ichi Zaitsu, Takao Tsuchiya
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 12175-12175
  • DOI: 10.1038/s41598-018-30743-9
  • Peer Reviewed / Open Access
• [Presentation] 共振器位相整合四光波混合による連続発振ラマンサイドバンドの観測 (2020)
  • Author(s): 谷口渓一、財津慎一、加地範匡
  • Organizer: レーザー学会学術講演会第40回年次大会
• [Presentation] 干渉型非線形自己相関法を用いた超高繰り返し超短光パルス列の時間波形評価 (2019)
  • Author(s): 竹山新悟、財津慎一、加地範匡
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Cavity-Enhanced Coherent Anti-Stokes Raman Spectroscopy for Realtime Trace Gas Analysis (2018)
  • Author(s): Shin-ichi Zaitsu
  • Organizer: SciX 2018
  • Int'l Joint Research / Invited