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射频板条CO2激光器并联谐振条件的研究 总被引:1,自引:0,他引:1
本文利用周期性网络模型计算了射频板条CO2激光器电极的纵向电压分布,探讨了并联谐振技术在板条器件中获得成功运用的原因。提出了利用并联谐振技术进一步提高电压分布均匀性的两个途径。 相似文献
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给出了射频板条CO2激光器α型放电集总参数等电电路模型。计算了谐振放电状态下集总参数的电路方程得到了沿激光器电极长度方向上的电压幅度和相位的分布,沿电极最小的相对电压幅度起伏约为1.27%,由模型推导出用宏观测量参数表示的RLP和E/Pgas的计算公式,不同于RalfMalz的结果,建立了射频板条CO2激光器的实验装置,获得了均匀射频放电和CO2激光。 相似文献
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分析了并联LLC谐振变换器的特性,并做了开关顺序并联与交错并联情况下变换器特性的比较,以UC3863芯片为核心控制芯片的开关电源,电路采用半桥结构的LLC谐振电路,这种模式很少被提出,通过实验证明了可行性和实用性,大大提高了LLC的工作效率。通过对各器件参数的理论计算,运用SABER仿真软件对变换器电路进行仿真和分析。文中以300V电压输入,12V-18V输出电压为例,2.5kW,500kHz并联LLC谐振变换器设计和仿真来进行模型分析,从而总结出并联LLC谐振变换器相对于传统单一LLC谐振变换器的优点。仿真结果验证了设计的可行性与结论的准确性。 相似文献
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从正交型变压器PRT的结构和控制技术出发,对先进的自激励振方式VRC软开关变换电源技术进行解析.利用电路图和工作波形图,重点说明自激励振方式VRC的4种控制方式的电路构成原理,简要阐述它们之间的区别、工作原理和实用技术参数.这4种控制方式是:并联谐振频率控制方式、谐振电压脉冲宽度控制方式、升压型电压控制方式和复合控制方式.它们都是基于控制PRT电感量来实现自动稳定输出电压的自激励振方式的软开关变换电源技术. 相似文献
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分析典型的电流型并联谐振逆变器和全桥拓扑的冷阴极荧光灯驱动电路的工作原理和特点;重点分析全桥拓扑的谐振回路的构成和谐振过程;由变压器的原边漏感、副边漏感、励磁电感和并联谐振电容构成的谐振回路形成正弦电压来驱动冷阴极荧光灯;并给出该拓扑的设计步骤和方法。 相似文献
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高效率大功率连续半导体激光器 总被引:3,自引:1,他引:2
从大功率半导体激光器的工作机理出发,对影响激光器电光转换效率的主要因素,如激光器的斜率效率ηd、阈值电流Ith、开启电压V0、串联电阻Rs以及工作电流I等进行了分析,进而讨论了提高电光转换效率的主要技术途径。通过对应变量子阱大光腔激光器外延材料开启特性的优化、大功率激光器芯片横向限制工艺的改进以及对大功率微通道热沉制作等技术的研究,制作了808nm连续半导体激光器阵列。在工作电流140A时,阵列工作电压为1.83V,输出功率145W,电光转换效率达到56.6%。 相似文献
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复合腔电光调Q微晶片激光器是一种集成化的固体激光器,具有体积小、基横模、单纵模、线偏振运转,输出脉冲重复频率高,脉宽窄的优点,是高重复频率、高光束质量的主振荡功率放大器(MOPA)激光系统的理想种子源。进行了低压驱动复合腔电光调Q微晶片激光器的实验与理论研究。根据理论分析,增加电光晶体长度和提高端面反射率可减小标准具透射谱半宽度,进而降低驱动电压。设计了两套激光器实验方案。实验中激光增益介质和电光晶体分别选用Nd:YVO4和LiTaO3,谐振腔尺寸小于3 mm×3 mm×2.5 mm。方案1主要研究增加电光晶体长度后的激光器输出特性,在抽运功率184 mW,240 V驱动电压下,可实现300 kHz激光脉冲输出,脉冲宽度10 ns,峰值功率9.4 W。在方案2中,通过进一步提高端面反射率,在短时间内可输出1 MHz脉冲。 相似文献
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Ban D. Sargent E.H. Dixon-Warren St.J. Hinzer K. White J.K. SpringThorpe A.J. 《Quantum Electronics, IEEE Journal of》2004,40(6):651-655
We apply scanning voltage microscopy to actively biased multiquantum-well ridge-waveguide semiconductor lasers. We localize the source of a major and hitherto unexplained sample-to-sample difference in current-voltage characteristics to the responsible junction. This is found to correspond to the regrowth interface, subsequently confirmed through secondary ion mass spectrometry to have different doping profiles in the two cases. By comparing the internal voltage profile of the operating lasers, we found that a voltage difference of 0.44 V occurred within /spl sim/100 nm of the regrowth interface in these laser structures, accounting for 88% of the difference in the measured series resistance. Additionally, 75% of the total device series resistance is associated with the structure's heterobarriers. These results relate nanoscopic measurements to macroscopic performance and are of significance in improving device understanding, design, and reliability. 相似文献
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为了精密控制分布反馈激光器的温度与电流, 采用数字信号处理芯片, 设计了分布反馈激光器驱动装置。通过该装置设定激光器温度和电流的参考电压, 经数模转换, 再通过温度和电流驱动模块, 馈入并驱动分布反馈激光器, 进行了实验验证。结果表明, 40min内温度变化极差与标准差分别不超过5mK和0.7mK, 电流变化极差与标准差不超过40μA和6μA; 驱动半导体光放大器, 关断时间小于1μs, 具有良好的瞬间响应特性; 该装置具有较高的温度和电流稳定性, 流控模块具有良好的瞬态特性, 能够精密控制分布反馈激光器的温度和电流。该控制装置可用于光腔衰荡光谱研究, 控制分布反馈激光器并驱动光放大器来关断激光。 相似文献
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K.D. Choquette G. Hasnain Y.H. Wang J.D. Wynn R.S. Freund A.Y. Cho R.E. Leibenguth 《Photonics Technology Letters, IEEE》1991,3(10):859-862
GaAs quantum well vertical-cavity surface emitting lasers fabricated using low damage reactive ion etching are discussed. Lasers which are partially and completely etched through their structure are compared. The surface recombination velocity of exposed GaAs is not exacerbated in deep etched lasers; other loss mechanisms in shallow etched lasers have comparable impact on laser performance. Etched lasers exhibit low voltage and small differential series resistance at threshold, while devices fabricated by a combination of etching and ion implantation possess lower threshold current. It is found that reactive ion etching has little additional effect on laser operation, whereas the different device structures considered do influence laser performance.<> 相似文献
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《Electron Devices, IEEE Transactions on》1976,23(12):1333-1336
Measurements of the second current derivative of the external voltage d2V/dI2generated by stripe-geometry (AlGa)As junction lasers are reported and correlated with corresponding measurements of the first derivative dV/dI as a function of current. In the vicinity of the lasing threshold, a pronounced negative peak occurs in the second-derivative signal as a result of the voltage saturation induced by the stimulated emission. With further increases in current, the second derivative assumes nonzero positive values for lasers with incomplete saturation of the junction voltage, while complete saturation is characterized by a near-zero value for the derivative. A pronounced fine structure observed in the second derivative at currents above threshold indicates the presence of perturbations in the saturated state of a nominally well-behaved laser. 相似文献
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Chemically treating laser facets with aqueous sulfides can significantly improve the electrostatic discharge (ESD) performance of InGaAsP semiconductor lasers. Commercial lasers free of internal defects were subjected to forward-biased Human Body Model ESD stress pulses. Devices passivated with sulfides exhibited a mean ESD failure voltage more than 400% higher than that of the untreated control group. Subsequent accelerated aging experiments suggest that a thick layer of oxide covering the laser facets, largely removed by the sulfide treatment, is responsible for the low ESD failure voltage on untreated devices. This suggests that sulfide passivation followed by facet encapsulation in a robust dielectric could result in permanent protection against ESD failure 相似文献