研究目的
Investigating the production of ultramonochromatic tunable terahertz radiation for high-resolution molecular spectroscopy using the Novosibirsk free-electron laser (NovoFEL).
研究成果
The filtration system allows for the production of tunable approximately single-mode radiation with monochromaticity δf/f ≤ 5·10-8 and power up to 50-100 mW, suitable for high-resolution THz spectroscopy. The system forms a quasi-continuous coherent radiation in the time domain.
研究不足
The spectral resolution of the FPI system is defined by the longest FPI, while the free dispersion range is defined by the shortest one. The real spectral width of a single filtered mode is a parameter of the NovoFEL and can be much smaller than the resolution of the FPI system.
1：Experimental Design and Method Selection:
The study focuses on the filtration of a single longitudinal mode of the NovoFEL radiation using a cascade of three resonance Fabry-Perot interferometers (FPIs) to achieve ultramonochromatic radiation.
2：Sample Selection and Data Sources:
The NovoFEL radiation in stabilized regime is used, with its fine spectral structure consisting of 1000-2000 coherent longitudinal modes.
3：List of Experimental Equipment and Materials:
The setup includes three resonance mesh FPIs with lengths of L0/10, L0/100, and L0/1000, and optical isolators to avoid undesirable optical feedback.
4：Experimental Procedures and Operational Workflow:
The FPIs are used to filter the NovoFEL radiation, with each FPI transmitting every tenth input mode, resulting in a single mode output.
5：Data Analysis Methods:
The spectral width and stability of the longitudinal modes are analyzed, with plans to measure real spectral width by heterodyne mixing on a Schottky diode.
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