热透镜效应对固体激光器输出影响研究

对含热透镜的固体激光器谐振腔进行理论分析,得到等效谐振腔的G参数,分析讨论G参数随泵浦功率的变化,给出了不同腔型输出功率的变化情况.采用TmYAP激光器作为研究对象,由实验验让了不同腔型激光输出功率的变化,得出对平平腔固体激光器而言,短腔适合高功率输出的结论.     

S波段宽带连续波速调管的研制

本文介绍了一种用于通信系统的S波段宽带连续波速调管,详细给出了两种宽带输出电路：滤波器加载重叠模双间隙耦合腔宽带输出电路和三节滤波器加载宽带输出电路的设计、计算和测试结果。最后,给出了分别采用上述两种宽带输出电路的速调管样管的测试结果,其中采用三节滤波器加载宽带输出电路方案的样管在大于4.6%的瞬时带宽内获得的连续波输出功率大于17 kW。     

Effects of small-scale phase perturbations on laser oscillator beam quality

A simplified analysis is presented for predicting the effects of small-scale intracavity phase perturbations or scattering centers on the power output and beam quality of high-power laser oscillators. The small-scale perturbations are viewed as scattering energy from the unperturbed lowest order transverse mode of the cavity into numerous higher order transverse modes. These modes are, unfortunately, then regeneratively amplified within the laser cavity. This produces only a small change in the effective output coupling and the total power output from the perturbed laser cavity, but causes a serious deterioration in the far-field brightness and on-axis intensity of the output beam.     

S 波段连续波速调管宽带输出电路的设计与测试

本文开展了一种用于通信系统的4.6%带宽的S 波段连续波宽带速调管KS4158 的研制工作,重点研究了该速调管的宽带输出电路,详细介绍了宽带输出电路的两种设计方案：滤波器加载重叠模双间隙耦合腔宽带输出电路和三节滤波器加载宽带输出电路。文中还介绍了基于矢量网络分析仪的宽带输出电路的扫频测量法,给出了这两种宽带输出电路的测试结果。最后,给出了分别采用上述两种宽带输出电路方案的两只速调管的测试结果,并对这两种方案进行了分析和比较,其中采用三节滤波器加载宽带输出电路方案的样管的连续波输出功率大于17kW,瞬时带宽大于4.6%。     

环形掺Er3+光纤激光器输出特性分析与实验研究

理论分析了掺Er3+光纤环形腔激光器的输出特性，获得了稳态条件下激光器输出功率、阈值泵浦功率和斜率效率的解析表达式，分析了泵浦光波长、泵浦功率、Er3+光纤掺杂浓度、输出端耦合器分光比等的影响，推导了在特定输出波长处获得最大输出功率所需最佳掺Er3+光纤长度的解析表达式。进行了LD泵浦掺Er3+光纤环形腔激光器的实验工作，获得了斜率效率10%以上的激光输出。     

环形掺Er3+光纤激光器输出特性分析与实验研究

理论分析了掺Er^3＋光纤环形腔激光器的输出特性，获得了稳态条件下激光器输出功率、阔值泵浦功率和斜率效率的解析表达式．分析了泵浦光波长、泵浦功率、Er^3＋光纤掺杂浓度、输出端耦合器分光比等的影响，推导了在特定输出波长处获得最大输出功率所需最佳掺Er^3＋光纤长度的解析表达式。进行了LD泵浦掺Er^3＋光纤环形腔激光器的实验工作，获得了斜率效率10％以上的激光输出。     

Characteristics of a semiconductor laser with external feedback

The theoretical analysis of the compound cavity of a semiconductor laser with external optical feedback is conducted. For large optical feedback, the output power from the laser and its oscillation frequency differ from those for small optical feedback. From the rate equations of the compound cavity, the conditions of the laser oscillation are derived in the presence of large optical feedback The dependencies of the output power and the laser oscillation frequency on the external-cavity length are investigated. Some new results involving laser oscillation depending on the external-cavity length are presented. The experimental results are compared with theoretical predictions. The dependence of the laser oscillation on the external-cavity length is qualitatively explained in the present model     

Microwave Hall effect in a TE11p cylindrical cavity

A microwave Hall effect signal produced by a TE_11p degenerate cylindrical cavity is considered. The analysis presented identifies the cavity end walls as the source of the Hall signal, and a formula relating the Hall output power to the dimensions of the cavity is derived. Experimental results from the measurement of the empty cavity signal at 9.5 GHz are reported     

基于圆盘加载波导的THz 分布作用振荡器的模拟研究

提出了一种新型的基于圆盘加载波导的THz 分布作用振荡管（Extended-Interaction Oscillator, EIO）,它由圆盘加载波导输入谐振腔、漂移段和输出腔三部分组成。利用2.5 维电磁仿真软件－UNIPIC 对其进行模拟研究。研究表明慢波结构的长度、漂移管的长度和输出管的高度对输出功率和频率产生显著影响。经过最优化设计,在注电压为27.7 kV,电流为20 mA 的条件下,仿真得出其中心频率为730.86 GHz ,峰值功率为442.1 mW 的THz 波。     

一种可调的全密封大功率氦-氖激光管

本文介绍一种采用玻璃封接工艺制作的全密封大功率氦-激光管。该管系全内腔可调结构，腔长1米，在不同加磁场，不用氦-3的条件下，可在6328A输出40mW以上的多模功率，寿命可保用三年。     

Design considerations for the high-power multicavity klystron

A confined-flow large-signal formulation of the klystron interaction equations is presented and applied to the analysis of the multicavity klystron amplifier. The effects of cavity voltage, cavity phase, drift length, and beam parameters are studied. The two- and three-cavity amplifiers are studied in detail, and several numerical examples of four-cavity klystrons are also given. A significant second-harmonic component of velocity modulation is shown to improve the dc to RF conversion efficiency. Two methods of obtaining this modulation are discussed. The large-signal theory presented here has been used to design a five-cavity klystron which is 50 percent efficient and has a controllable power transfer curve. Theoretical and experimental power transfer curves are presented for several 1 1/4-MW klystrons; the calculated output power is between 4 and 10 percent greater than the experimental values.     

LD纵向泵浦腔内倍频激光器腔参数的选择

从理论上研究了在一定长ＫＴＰ情况下ＬＤ纵向泵浦Ｎｄ：ＹＶＯ４／ＫＴＰ腔内倍频激光器的绿光输出与腔长、输出镜曲率半径及泵浦光斑半径等参数的关系。根据分析选择了一组实验参数，在入射泵浦功率为６６８．７ｍｗ时获得了１５３．９ｍｗ的绿光输出，光一光转换效率为２３％。将实验结果与理论计算值进行了比较，两者符合较好。     

新型准光学瓦级固态功率合成器

本文介绍一种新型短焦距开放腔固态功率合成器的实验结构和实验结果。由4只标称功率为155mW,160mW,160mW和165mW的Gunn二极管,采用串联型接法进行的合成实验,在X波段获得了开机输出功率大于1W,稳定输出功率为850mW。     

The output power of a 6328-Å He-Ne gas laser

Expressions are derived for the output power of a gas laser in single-mode operation. This theory is then extended to multimode operation where the mode spacing is less than the pressure-broadened "natural" atomic linewidth. Using measured values for the linewidth and saturation parameters, these formulas are used to predict 6328-Å output power for a He-Ne laser as a function of laser gain, cavity loss, and output coupling. Experiments are reported which show good agreement with the theoretical predictions, and it is concluded that the theory presented here is adequate to describe the main features of the power output behavior of a 6328-Å He-Ne gas laser.     

一种可降低Littman-Metcalf光栅外腔半导体激光器衍射损耗的结构设计

基于原有Littman-Metcalf型光栅外腔半导体激光器的工作原理,设计了一种可以降低衍射损耗的外腔结构。在Littman-Metcalf结构的基础上增加一个反射镜,将闪耀光栅二次衍射产生的零级衍射光反馈回半导体激光器本征腔。推导了新结构模型外腔损耗的表达式,通过等效腔的概念对两种结构激光器的外腔损耗、阈值电流、输出线宽以及输出功率进行了仿真分析。结果表明：将二次衍射产生的零级光反馈回有源区可有效降低Littman-Metcalf结构激光器的外腔损耗,提高了系统的耦合效率,从而降低阈值电流,提高了激光器的输出功率。同时,由于提高了外腔反射效率,该外腔结构进一步压窄激光器的输出线宽。对影响低损耗Littman-Metcalf外腔激光器输出线宽以及输出功率的因素(端面反射率、内外腔长、闪耀光栅衍射效率以及反射镜反射率等)也进行了仿真分析,为后期激光器制作提高了理论指导。     

高掺杂浓度、短腔长Yb3 + 光纤环形激光器

采用高掺杂浓度Yb3 + 光纤研制了短腔长环形激光器,对比普通掺杂Yb3 + 光纤分析了激光器阈值、输出功率等重要特性与光纤长度、输出耦合器耦合比等参量之间的关系,并通过具体实验进行验证,实验现象与模拟结果基本一致。     

高掺杂浓度、短腔长Yb3 + 光纤环形激光器

采用高掺杂浓度Yb^3 光纤研制了短腔长环形激光器，对比普通掺杂Yb^3 光纤分析了激光器阈值、输出功率等重要特性与光纤长度、输出耦合器耦合比等参量之间的关系，并通过具体实验进行验证，实验现象与模拟结果基本一致。     

自调Q掺铒光纤激光器动态特性研究

为了研究自调Q掺铒光纤激光器输出动态特性,采用搭建全光纤结构的线形腔和环形腔自调Q掺铒光纤激光器进行了理论分析和实验验证。实验中,当抽运功率达到起振阈值后,随着抽运功率的增加,用示波器观察输出激光,线形腔输出激光依次经历了连续波、自调Q两种运行状态,由于抽运功率的限制,未能再次出现连续波运行状态,而环形腔输出激光则先经历了自调Q运行状态,然后是连续波运行状态;线形腔在抽运功率21mW~190mW的范围内,可获得脉冲宽度8s ~100s范围内可调、重复频率2.5kHz~54kHz范围内可调的自调Q脉冲;环形腔在抽运功率为16.2mW~110mW时,可获得的脉冲宽度在165s左右。结果表明,自调Q掺铒光纤激光器因腔结构的不同,输出激光动态特性也不同;线形腔和环形腔均有自调Q脉冲输出,但线形腔自调Q范围更大。     

Analyses of two-cavity gyroklystron with feedback

Making use of the linear kinetic theory and the perturbation approach, a gyroklystron with feedback, in which a low order (TE₀₁₁) mode is presented in the bunching cavity by the feedback of the output cavity, and the low order mode in the bunching cavity is coupled by the electron beam to a high order (TE₀₂₁) mode in the output cavity, has been investigated in detail. And electron beam to wave interaction in each cavity and electron bunching mechanism in the bunching cavity have been analysed. The formulas of electron beam to wave interaction power and starting current etc. have been derived. Then some calculations are carried out.     

功率提取对连续波DF化学激光器腔压的影响

为了研究功率提取对连续波DF化学激光器光腔压力的影响,基于一台小型燃烧驱动连续波DF激光器装置,进行了一系列实验,实验结果显示,随着提取功率的增大,光腔压力逐渐减小。利用一维定常流理论和光腔动力学理论,建立了从燃烧室到光腔出口的一维数学模型,得到光腔压力随比功率的变化关系曲线,取得了与实验较为一致的计算结果,从而给出了功率提取对光腔压力影响的理论解释,同时也验证了数学模型的合理性。数学模型和实验结果同时表明,从光腔中提取功率,光腔压力将有一定程度的下降,将实验条件参量代入模型计算,得出比功率为50J/g时,光腔压力比无功率输出时下降约7.4%。