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FELiChEM is an infrared free electron laser (FEL) facility underconstruction, which consists of two oscillators generating middle-infrared andfar-infrared laser covering the spectral range of 2.5-200 ${\rm{\mu m}}$. Inthis paper, we numerically study the output characteristics of themiddle-infrared oscillator with the accurate cavity length detuning. Emphasisis put on the temporal structure of the micropulse and the correspondingspectral bandwidth. Taking the radiation wavelengths of 50 ${\rm{\mu m}}$ and 5${\rm{\mu m}}$ as examples, we show that the output pulse duration can be tunedin the range of 1-6 ps with corresponding bandwidth of 13-0.2\% by adjustingthe cavity length detuning. In addition, a special discussion on the combstructure is presented, and it is indicated that the comb structure may arisein the output optical pulse when the normalized slippage length is much smallerthan unity. This work has reference value for the operation of FELiChEM andother FEL oscillators.

The effect of cavity length detuning on the output characteristics for the middle infrared FEL oscillator of FELiChEM