边耦合光腔用于远红外FEL的分析
Simulation of the resonator with inserted scraper output coupler for the farinfrared FEL
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摘要: 模拟了边耦合输出用于FIR FEL 的可实用性，证明这种输出方式适合于远红外FEL。分析且模拟了光腔各种输出参数（如输出功率、腔增益、耦合效率等）随输出镜尺寸及位置的变化规律，找出了最佳的输出镜尺寸及位置。并对谐振腔有漂移管和无漂移管两种情况进行了比较。通过移动或者更换输出镜（输出反射镜），改变输出镜尺寸和位置，可以灵活地选择和调节光腔的Q值。能适应实验不同阶段的需要：例如在实验初期可以提高Q值，增大净增益；而在做饱和实验时可以增大输出，使输出功率最大。Abstract: For farinfrared FEL, it was found that the diffractive loss is so large that it is half of total loss due to the longer wavelength using holecoupled resonator. By changing the size of the hole, the diffractive loss can't be reduced efficiently. To improve the quality of resonator, the simulation and design of the CAEP FIR FEL with inserted scraper output coupler had been made with the help of our 3D FEL oscillator code. It is proved that the inserted scraper is effective and applicable for the FIR FEL. Using inserted scraper output coupler, the optical cavity Q can be tuned freely. The saturated power, the net gain and the coupling efficiency are evaluated as a function of the scraper radius and the distance between scraper and the center of mirror.
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Key words:
- freeelectron laser(fel) /
- farinfrared /
- optical resonator /
- coupler
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