Abstract
The FELiChEM infrared free-electron laser consists of two oscillators: the mid-infrared oscillator and the far-infrared oscillator, covering the spectral range of 2–40μm and 20–200μm, respectively. The mid-infrared oscillator finished the commissioning in 2020 and a deep spectral gap around the wavelength of 21μm existed. In this paper, combining theoretical analysis and numerical simulation, the research on this waveguide effect has been carried out and the simulation results highly agree with the measurement. Through using the same method, we study the waveguide effect in the far-infrared oscillator for different waveguide sizes. The results show that, with the waveguide of 30 mm × 10 mm initially used, a spectral gap will be found at 89μm and the FEL power at the wavelength longer than 100μm will be rather low. Based on these studies, a reasonable waveguide size of 30 mm × 16 mm has been reselected to make the tunable range of the far-infrared oscillator covering 20–200μm. The recent measurement carried out in 2021 also agree with the prediction of the simulation results.
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