Fourier Transform Spectroscopy is now one of the most important and useful spectral methods in infrared and farinfraredregion.
傅里叶变换光谱学方法是目前红外、远红外波段最重要的一种光谱方法。
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In the high efficiency and small signal region, we investigate theoretically the efficiency enhancement mechanism of farinfrared free electron laser (FIR-FEL) with a reverse tapering waveguide.