Resonance Fabry-Perot Interferometer for Ultra-high Resolution Spectroscopy of Free Electron Laser Radiation

Pulse-periodical free electron lasers with an optical cavity can have a fine and always have a hyperfine spectral structure of radiation due to the coherence of output pulses, which are parts of different or the same intra-cavity light pulse, respectively. The optimal instrument for measuring these...

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Bibliographic Details
Main Author: Kubarev, Vitaly V.
Format: Conference Proceeding
Language:English
Subjects:
Free electron lasers
Frequency-domain analysis
Instruments
Laser modes
Measurement by laser beam
Optical interferometry
Spectroscopy
Online Access:Request full text
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Summary:Pulse-periodical free electron lasers with an optical cavity can have a fine and always have a hyperfine spectral structure of radiation due to the coherence of output pulses, which are parts of different or the same intra-cavity light pulse, respectively. The optimal instrument for measuring these structures is the resonance Fabry-Perot interferometer described in this article. The composition of transverse supermodes of the NovoFEL in various regimes was revealed by the device, operating in a frequency-domain mode with a 5*10 -8 resolution. The time-domain regime of the interferometer, which has practically no limitations, made it possible to accurately measure the monochromaticity of the NovoFEL modes, which turned out to be equal to 2.2*10 -8 .
ISSN:2162-2035
DOI:10.1109/IRMMW-THz50926.2021.9567578