对史密斯-帕塞尔自由电子激光光栅的研究
发布时间：2021-09-12 09:21
为了研究史密斯-帕塞尔自由电子激光的输出频率和光栅槽深、光栅槽长、光栅槽宽的关系,对于基于矩形光栅的史密斯-帕塞尔自由电子激光利用粒子模拟软件进行模拟和理论分析。首先,利用粒子模拟软件模拟对于基于矩形光栅的史密斯-帕塞尔自由电子激光进行了研究,发现史密斯-帕塞尔自由电子激光的输出频率随光栅槽深、光栅槽长、光栅槽宽的增大而减少。接着,对史密斯-帕塞尔自由电子激光的光栅槽进行了理论分析,发现每个光栅槽都可以等效为一个LC谐振电路,并发现在史密斯-帕塞尔自由电子激光中存在两种辐射,一种是史密斯-帕塞尔辐射,另一种是LC振荡辐射。最后,对光栅槽的LC振荡辐射进行了估算,发现史密斯-帕塞尔自由电子激光输出频率的模拟值与光栅槽的LC振荡辐射估算值的数量级均为102 GHz,且变化规律上一致。据此推测决定史密斯-帕塞尔自由电子激光输出频率的应该是光栅槽,而不是谐振腔。
【文章来源】：中国光学. 2020,13(02)北大核心EICSCD
【文章页数】：15 页
【部分图文】：
基于矩形光栅的SP FEL的模拟图
图3 在不同光栅槽深时SP FEL中电子注的动能沿z轴分布图表2 在不同光栅槽深时SP FEL输出频率的模拟值Tab.2 Simulation values of output frequency of SP FEL at different depths of grating groove Parameters Values Number of periods 32 Period length of grating/mm 0.3 Slot length of grating/mm 1.5 Slot width of grating/mm 0.1 Slot depth of grating/mm 0.15 0.2 0.25 0.3 0.35 0.4 Simulation value of output frequency / GHz 723.379 529.786 483.632 436.827 400.121 370.060
where D is the grating period, n is the number of spatial harmonics, θ is the emission angle (that is, the angle between the SPR and the direction of electron motion), and β is the ratio of the velocity of electrons to the speed of light, β=v/c. According to the equation (1), the wavelength range of spontaneous SPR fundamental wave is from D( 1 β -1 )to D( 1 β +1 ) [17-22] . According to traditional SP FEL theory, the resonator surface can reflect the SPR of various wavelengths back to the electron beams, and the reflected SPR can modulate the electron beams. However, at the initial stage of electron beam injection, the SPR is not strong enough to cause the electron beams to bunching and start oscillation. When the injection time exceeds the start time to oscillate, the electron beams will begin to bunching due to the increase of SPR intensity. When the beam-wave interaction meets the oscillation conditions, the net gain of the SPR satisfying the resonance conditions in the resonator will begin to increase gradually and finally establish the steady-state oscillation in the resonator. According to the resonance conditions, the resonator size must be reduced in order to increase the output frequency of the SP FEL based on rectangular grating. However, in the simulation of SP FEL, our group found that it was difficult to increase the output frequency of the SP FEL based on rectangular grating by reducing the resonator size. We also found that the grating grooves should be changed to increase the output frequency of the SP FEL.3 Simulation and analysis of the SP FEL based on rectangular grating
【参考文献】：
期刊论文
[1]基于微型谐振腔的史密斯-帕赛尔自由电子激光[J]. 孟现柱,王明红,孙桂芳,吴立恒. 聊城大学学报(自然科学版). 2018(04)
[2]时变磁化等离子体的LTJEC-FDTD方法研究[J]. 席阳红,谢国大,徐辉,黄志祥,吴先良,王丽华. 发光学报. 2018(07)
[3]超表面上表面等离激元波的光栅衍射行为研究[J]. 王雪飞,卢振武,王泰升,鱼卫星. 中国光学. 2018(01)
[4]Characteristic analysis of a Smith–Purcell terahertz source[J]. Xian-Zhu Meng,Ming-Hong Wang,Li-Ming Zhang,Zhong-Min Ren. Photonics Research. 2016(05)
[5]多信道二维光子晶体滤波器[J]. 刘杰,铁生年,卢辉东. 光学精密工程. 2016(05)
[6]基于史密斯-帕赛尔效应的太赫兹振荡器的原理与特性分析[J]. 孟现柱,王明红,张黎明,任忠民. 光子学报. 2016(04)
[7]光栅—谐振腔复合结构中的史密斯—帕塞尔辐射（英文）[J]. 孟现柱,王明红,任忠民. 红外与毫米波学报. 2016(01)
[8]太赫兹频段一维介质光子晶体中的史密斯-帕塞尔辐射特性模拟[J]. 史宗君,唐效频,兰峰,杨梓强. 红外与毫米波学报. 2014(02)
[9]液晶-金属光子晶体波导的光学特性[J]. 杨波,梁静秋,梁中翥,王维彪. 发光学报. 2011(11)
[10]亚波长金属光栅的表面等离子体激元共振特性[J]. 刘镜,刘娟,王涌天,谢敬辉. 中国光学. 2011(04)
本文编号：3393970
【文章来源】：中国光学. 2020,13(02)北大核心EICSCD
【文章页数】：15 页
【部分图文】：
基于矩形光栅的SP FEL的模拟图
图3 在不同光栅槽深时SP FEL中电子注的动能沿z轴分布图表2 在不同光栅槽深时SP FEL输出频率的模拟值Tab.2 Simulation values of output frequency of SP FEL at different depths of grating groove Parameters Values Number of periods 32 Period length of grating/mm 0.3 Slot length of grating/mm 1.5 Slot width of grating/mm 0.1 Slot depth of grating/mm 0.15 0.2 0.25 0.3 0.35 0.4 Simulation value of output frequency / GHz 723.379 529.786 483.632 436.827 400.121 370.060
where D is the grating period, n is the number of spatial harmonics, θ is the emission angle (that is, the angle between the SPR and the direction of electron motion), and β is the ratio of the velocity of electrons to the speed of light, β=v/c. According to the equation (1), the wavelength range of spontaneous SPR fundamental wave is from D( 1 β -1 )to D( 1 β +1 ) [17-22] . According to traditional SP FEL theory, the resonator surface can reflect the SPR of various wavelengths back to the electron beams, and the reflected SPR can modulate the electron beams. However, at the initial stage of electron beam injection, the SPR is not strong enough to cause the electron beams to bunching and start oscillation. When the injection time exceeds the start time to oscillate, the electron beams will begin to bunching due to the increase of SPR intensity. When the beam-wave interaction meets the oscillation conditions, the net gain of the SPR satisfying the resonance conditions in the resonator will begin to increase gradually and finally establish the steady-state oscillation in the resonator. According to the resonance conditions, the resonator size must be reduced in order to increase the output frequency of the SP FEL based on rectangular grating. However, in the simulation of SP FEL, our group found that it was difficult to increase the output frequency of the SP FEL based on rectangular grating by reducing the resonator size. We also found that the grating grooves should be changed to increase the output frequency of the SP FEL.3 Simulation and analysis of the SP FEL based on rectangular grating
【参考文献】：
期刊论文
[1]基于微型谐振腔的史密斯-帕赛尔自由电子激光[J]. 孟现柱,王明红,孙桂芳,吴立恒. 聊城大学学报(自然科学版). 2018(04)
[2]时变磁化等离子体的LTJEC-FDTD方法研究[J]. 席阳红,谢国大,徐辉,黄志祥,吴先良,王丽华. 发光学报. 2018(07)
[3]超表面上表面等离激元波的光栅衍射行为研究[J]. 王雪飞,卢振武,王泰升,鱼卫星. 中国光学. 2018(01)
[4]Characteristic analysis of a Smith–Purcell terahertz source[J]. Xian-Zhu Meng,Ming-Hong Wang,Li-Ming Zhang,Zhong-Min Ren. Photonics Research. 2016(05)
[5]多信道二维光子晶体滤波器[J]. 刘杰,铁生年,卢辉东. 光学精密工程. 2016(05)
[6]基于史密斯-帕赛尔效应的太赫兹振荡器的原理与特性分析[J]. 孟现柱,王明红,张黎明,任忠民. 光子学报. 2016(04)
[7]光栅—谐振腔复合结构中的史密斯—帕塞尔辐射（英文）[J]. 孟现柱,王明红,任忠民. 红外与毫米波学报. 2016(01)
[8]太赫兹频段一维介质光子晶体中的史密斯-帕塞尔辐射特性模拟[J]. 史宗君,唐效频,兰峰,杨梓强. 红外与毫米波学报. 2014(02)
[9]液晶-金属光子晶体波导的光学特性[J]. 杨波,梁静秋,梁中翥,王维彪. 发光学报. 2011(11)
[10]亚波长金属光栅的表面等离子体激元共振特性[J]. 刘镜,刘娟,王涌天,谢敬辉. 中国光学. 2011(04)
本文编号：3393970
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/3393970.html
