A wideband terahertz (THz) output network consisting of a pyramidal horn and a diamond Brewster window has been developed for 0.7–1.0-THz traveling-wave tube (TWT) amplifier and is measured at 0.325–0.5 THz owing to the limitation of the measurement facility. A pyramidal horn is designed to convert the waveguide mode into a high-purity quasi-plane polarized mode to meet the demand of the Brewster window. A diamond Brewster window plate with low THz transmission loss is fabricated via chemical vapor deposition (CVD). The plate is directly placed on the pyramidal horn with a Brewster angle. A circular window plate supporter is intended to balance the stress distribution during diamond-metal brazing. The measurement shows transmission coefficient is better than 0.85 within a wide bandwidth of 0.325–0.5 THz. This letter provides a practical way for a single diamond window structure for THz TWT amplifiers.

中文翻译：

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太赫兹TWT放大器应用的宽带输出Brewster窗口

已经开发出一种由金字塔形喇叭和钻石布鲁斯特窗组成的宽带太赫兹（THz）输出网络，用于0.7–1.0 THz行波管（TWT）放大器，由于测量的局限性，其测量值为0.325–0.5 THz设施。金字塔形喇叭设计用于将波导模式转换为高纯度的准平面偏振模式，以满足Brewster窗口的需求。通过化学气相沉积（CVD）制造了具有低THz传输损耗的金刚石Brewster窗板。板直接以布儒斯特角放置在角锥上。圆形窗板支撑件旨在平衡金刚石金属钎焊过程中的应力分布。测量表明，在0.325–0.5 THz的宽带宽内，传输系数优于0.85。