2021 Fiscal Year Final Research Report
High-quality THz OAM mode generation based on difference frequency generation
| Project/Area Number |
19K05299
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Chiba University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | テラヘルツ / 光渦 / 軌道角運動量 |
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| Outline of Final Research Achievements |
We have demonstrated a widely tunable terahertz (THz) vortex generation based on difference frequency generation in combination with a 4’-dimethylamino-N-methyl-4-stilbazolium tosylate crystal pumped by 1.5μm dual-wavelength pump beams having Gaussian and optical vortex profiles. The generated THz vortex output exhibits a high-purity orbital angular momentum mode with a topological charge of LTHz = ± 1 in a frequency range of 2-6 THz. The maximum average power of the THz vortex output reached up to ~3.3μW at 4 THz.
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| Free Research Field |
光量子工学
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| Academic Significance and Societal Importance of the Research Achievements |
非線形フォトニクスに立脚した本手法において、これまで実現できなかったテラヘルツ光渦の周波数可変性を実現した。さらに、軌道角運動量の高純度固有モードを各発生周波数において担保できる点が大きな利点として挙げられる。周波数可変高純度テラヘルツ光渦光源を用いる事で、軌道角運動量を主成分とした新奇テラヘルツ分光など、テラヘルツ領域における光物性研究への新たな応用展開が期待される。
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