2022 Fiscal Year Final Research Report
Mid-infrared ultrashort-pulsed comb source toward advanced vibrational spectroscopy
| Project/Area Number |
20H02651
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 中赤外波長域 / 超短パルスレーザー / 光周波数コム / 振動分光 / アト秒科学 |
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| Outline of Final Research Achievements |
The aim of this study is to create a mode-locked laser with a spectral structure consisting of many combs in the mid-infrared region and excellent coherence between frequencies. We have developed a Cr:ZnS laser as the basis of this study and realized passive mode-locked oscillation. By introducing a dielectric multilayer mirror with a high-order dispersion design, we have succeeded in generating pulses with a center wavelength of 2.3 microns and a time width of 30 femtoseconds (4 cycles of optical field oscillation). A background-free absorption spectroscopy system was constructed using this laser, and vibrational spectroscopy that captures absorption spectra with high sensitivity in 1 millisecond was realized. Furthermore, we succeeded in demonstrating the principle of a method to precisely control the spectral structure of a mode-locked laser by utilizing resonant absorption of molecular vibrations.
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| Free Research Field |
量子エレクトロニクス
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で実証した、分子振動の共鳴吸収を用いてモード同期レーザーのスペクトル構造を精密に制御する手法は、新たなレーザー発振の形態を示すものである。基礎・応用の両面から今後のレーザー研究に新たな指針を提示するものであり、極めて高い学術的意義をもつ。また、開発した高輝度中赤外光源は、広い波長域にわたる振動分光の高感度・一括計測を可能にするものであり、微量ガス検知ひいては環境計測・呼気診断などに資する点で社会的意義が大きい。さらに、開発した光源は、高繰返し中赤外フェムト秒パルス光源として、高次高調波発生およびアト秒科学にも極めて有用である。今後のアト秒科学を推進する上での学術的意義が大きい．
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