采用光栅改善孔耦合自由电子激光光腔品质
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摘要: 提出采用光栅覆盖耦合孔以改善孔耦合腔品质的办法。CAEP自由电子激光器的三维数值模拟结果表明，该方法可以有效地减少腔的输出损失和衍射损失。此外，改进后的耦合孔还可用作电子束通道以使装置更紧凑。Abstract: A method to reduce the loss of a holecoupled resonator for a freeele ctron laser oscillator is proposed. A grating with a reflectivity of 50%-70% can be used to cover the hole . Both the extraction and diffraction losses can be reduced effectively, which is confirmed by numericals imulations using a three dimensional code with the parameters of a compact far in frared FEL oscillator built in China Academy of Engineering Physics. Furthermore,it can be used as an electron transparen t mirror to make the FEL device more compact and less expensive．
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Key words:
- freeelectron laser /
- holecoup ling /
- grating /
- cavity quality /
- electron transparent mirror /
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